[821] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * Mini start-stop-daemon implementation(s) for busybox
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| 4 | *
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| 5 | * Written by Marek Michalkiewicz <marekm@i17linuxb.ists.pwr.wroc.pl>,
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| 6 | * Adapted for busybox David Kimdon <dwhedon@gordian.com>
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[1765] | 7 | *
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[2725] | 8 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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[821] | 9 | */
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| 10 |
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[2725] | 11 | /*
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| 12 | This is how it is supposed to work:
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[821] | 13 |
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[2725] | 14 | start-stop-daemon [OPTIONS] [--start|--stop] [[--] arguments...]
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| 15 |
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| 16 | One (only) of these must be given:
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| 17 | -S,--start Start
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| 18 | -K,--stop Stop
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| 19 |
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| 20 | Search for matching processes.
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| 21 | If --stop is given, stop all matching processes (by sending a signal).
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| 22 | If --start is given, start a new process unless a matching process was found.
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| 23 |
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| 24 | Options controlling process matching
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| 25 | (if multiple conditions are specified, all must match):
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| 26 | -u,--user USERNAME|UID Only consider this user's processes
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| 27 | -n,--name PROCESS_NAME Look for processes by matching PROCESS_NAME
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| 28 | with comm field in /proc/$PID/stat.
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| 29 | Only basename is compared:
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| 30 | "ntpd" == "./ntpd" == "/path/to/ntpd".
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| 31 | [TODO: can PROCESS_NAME be a full pathname? Should we require full match then
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| 32 | with /proc/$PID/exe or argv[0] (comm can't be matched, it never contains path)]
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| 33 | -x,--exec EXECUTABLE Look for processes that were started with this
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[3232] | 34 | command in /proc/$PID/exe and /proc/$PID/cmdline
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| 35 | (/proc/$PID/cmdline is a bbox extension)
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[2725] | 36 | Unlike -n, we match against the full path:
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| 37 | "ntpd" != "./ntpd" != "/path/to/ntpd"
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| 38 | -p,--pidfile PID_FILE Look for processes with PID from this file
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| 39 |
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| 40 | Options which are valid for --start only:
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| 41 | -x,--exec EXECUTABLE Program to run (1st arg of execvp). Mandatory.
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| 42 | -a,--startas NAME argv[0] (defaults to EXECUTABLE)
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| 43 | -b,--background Put process into background
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| 44 | -N,--nicelevel N Add N to process' nice level
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| 45 | -c,--chuid USER[:[GRP]] Change to specified user [and group]
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| 46 | -m,--make-pidfile Write PID to the pidfile
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| 47 | (both -m and -p must be given!)
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| 48 |
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| 49 | Options which are valid for --stop only:
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| 50 | -s,--signal SIG Signal to send (default:TERM)
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| 51 | -t,--test Exit with status 0 if process is found
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| 52 | (we don't actually start or stop daemons)
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| 53 |
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| 54 | Misc options:
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| 55 | -o,--oknodo Exit with status 0 if nothing is done
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| 56 | -q,--quiet Quiet
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| 57 | -v,--verbose Verbose
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| 58 | */
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| 59 |
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[3232] | 60 | //usage:#define start_stop_daemon_trivial_usage
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| 61 | //usage: "[OPTIONS] [-S|-K] ... [-- ARGS...]"
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| 62 | //usage:#define start_stop_daemon_full_usage "\n\n"
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| 63 | //usage: "Search for matching processes, and then\n"
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| 64 | //usage: "-K: stop all matching processes.\n"
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| 65 | //usage: "-S: start a process unless a matching process is found.\n"
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| 66 | //usage: IF_FEATURE_START_STOP_DAEMON_LONG_OPTIONS(
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| 67 | //usage: "\nProcess matching:"
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| 68 | //usage: "\n -u,--user USERNAME|UID Match only this user's processes"
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| 69 | //usage: "\n -n,--name NAME Match processes with NAME"
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| 70 | //usage: "\n in comm field in /proc/PID/stat"
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| 71 | //usage: "\n -x,--exec EXECUTABLE Match processes with this command"
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| 72 | //usage: "\n in /proc/PID/{exe,cmdline}"
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| 73 | //usage: "\n -p,--pidfile FILE Match a process with PID from the file"
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| 74 | //usage: "\n All specified conditions must match"
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| 75 | //usage: "\n-S only:"
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| 76 | //usage: "\n -x,--exec EXECUTABLE Program to run"
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| 77 | //usage: "\n -a,--startas NAME Zeroth argument"
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| 78 | //usage: "\n -b,--background Background"
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| 79 | //usage: IF_FEATURE_START_STOP_DAEMON_FANCY(
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| 80 | //usage: "\n -N,--nicelevel N Change nice level"
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| 81 | //usage: )
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| 82 | //usage: "\n -c,--chuid USER[:[GRP]] Change to user/group"
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| 83 | //usage: "\n -m,--make-pidfile Write PID to the pidfile specified by -p"
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| 84 | //usage: "\n-K only:"
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| 85 | //usage: "\n -s,--signal SIG Signal to send"
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| 86 | //usage: "\n -t,--test Match only, exit with 0 if a process is found"
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| 87 | //usage: "\nOther:"
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| 88 | //usage: IF_FEATURE_START_STOP_DAEMON_FANCY(
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| 89 | //usage: "\n -o,--oknodo Exit with status 0 if nothing is done"
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| 90 | //usage: "\n -v,--verbose Verbose"
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| 91 | //usage: )
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| 92 | //usage: "\n -q,--quiet Quiet"
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| 93 | //usage: )
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| 94 | //usage: IF_NOT_FEATURE_START_STOP_DAEMON_LONG_OPTIONS(
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| 95 | //usage: "\nProcess matching:"
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| 96 | //usage: "\n -u USERNAME|UID Match only this user's processes"
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| 97 | //usage: "\n -n NAME Match processes with NAME"
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| 98 | //usage: "\n in comm field in /proc/PID/stat"
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| 99 | //usage: "\n -x EXECUTABLE Match processes with this command"
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| 100 | //usage: "\n command in /proc/PID/cmdline"
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| 101 | //usage: "\n -p FILE Match a process with PID from the file"
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| 102 | //usage: "\n All specified conditions must match"
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| 103 | //usage: "\n-S only:"
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| 104 | //usage: "\n -x EXECUTABLE Program to run"
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| 105 | //usage: "\n -a NAME Zeroth argument"
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| 106 | //usage: "\n -b Background"
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| 107 | //usage: IF_FEATURE_START_STOP_DAEMON_FANCY(
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| 108 | //usage: "\n -N N Change nice level"
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| 109 | //usage: )
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| 110 | //usage: "\n -c USER[:[GRP]] Change to user/group"
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| 111 | //usage: "\n -m Write PID to the pidfile specified by -p"
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| 112 | //usage: "\n-K only:"
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| 113 | //usage: "\n -s SIG Signal to send"
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| 114 | //usage: "\n -t Match only, exit with 0 if a process is found"
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| 115 | //usage: "\nOther:"
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| 116 | //usage: IF_FEATURE_START_STOP_DAEMON_FANCY(
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| 117 | //usage: "\n -o Exit with status 0 if nothing is done"
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| 118 | //usage: "\n -v Verbose"
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| 119 | //usage: )
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| 120 | //usage: "\n -q Quiet"
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| 121 | //usage: )
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| 122 |
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[1765] | 123 | #include <sys/resource.h>
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| 124 |
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| 125 | /* Override ENABLE_FEATURE_PIDFILE */
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| 126 | #define WANT_PIDFILE 1
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| 127 | #include "libbb.h"
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| 128 |
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[821] | 129 | struct pid_list {
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| 130 | struct pid_list *next;
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| 131 | pid_t pid;
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| 132 | };
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| 133 |
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[2725] | 134 | enum {
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| 135 | CTX_STOP = (1 << 0),
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| 136 | CTX_START = (1 << 1),
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| 137 | OPT_BACKGROUND = (1 << 2), // -b
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| 138 | OPT_QUIET = (1 << 3), // -q
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| 139 | OPT_TEST = (1 << 4), // -t
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| 140 | OPT_MAKEPID = (1 << 5), // -m
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| 141 | OPT_a = (1 << 6), // -a
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| 142 | OPT_n = (1 << 7), // -n
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| 143 | OPT_s = (1 << 8), // -s
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| 144 | OPT_u = (1 << 9), // -u
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| 145 | OPT_c = (1 << 10), // -c
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| 146 | OPT_x = (1 << 11), // -x
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| 147 | OPT_p = (1 << 12), // -p
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| 148 | OPT_OKNODO = (1 << 13) * ENABLE_FEATURE_START_STOP_DAEMON_FANCY, // -o
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| 149 | OPT_VERBOSE = (1 << 14) * ENABLE_FEATURE_START_STOP_DAEMON_FANCY, // -v
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| 150 | OPT_NICELEVEL = (1 << 15) * ENABLE_FEATURE_START_STOP_DAEMON_FANCY, // -N
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| 151 | };
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| 152 | #define QUIET (option_mask32 & OPT_QUIET)
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| 153 | #define TEST (option_mask32 & OPT_TEST)
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[821] | 154 |
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[2725] | 155 | struct globals {
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| 156 | struct pid_list *found_procs;
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| 157 | char *userspec;
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| 158 | char *cmdname;
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| 159 | char *execname;
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| 160 | char *pidfile;
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| 161 | char *execname_cmpbuf;
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| 162 | unsigned execname_sizeof;
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| 163 | int user_id;
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| 164 | smallint signal_nr;
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| 165 | } FIX_ALIASING;
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| 166 | #define G (*(struct globals*)&bb_common_bufsiz1)
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| 167 | #define userspec (G.userspec )
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| 168 | #define cmdname (G.cmdname )
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| 169 | #define execname (G.execname )
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| 170 | #define pidfile (G.pidfile )
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| 171 | #define user_id (G.user_id )
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| 172 | #define signal_nr (G.signal_nr )
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| 173 | #define INIT_G() do { \
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| 174 | user_id = -1; \
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| 175 | signal_nr = 15; \
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| 176 | } while (0)
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| 177 |
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| 178 | #ifdef OLDER_VERSION_OF_X
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| 179 | /* -x,--exec EXECUTABLE
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| 180 | * Look for processes with matching /proc/$PID/exe.
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| 181 | * Match is performed using device+inode.
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| 182 | */
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| 183 | static int pid_is_exec(pid_t pid)
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[821] | 184 | {
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[2725] | 185 | struct stat st;
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| 186 | char buf[sizeof("/proc/%u/exe") + sizeof(int)*3];
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[821] | 187 |
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[2725] | 188 | sprintf(buf, "/proc/%u/exe", (unsigned)pid);
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| 189 | if (stat(buf, &st) < 0)
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| 190 | return 0;
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| 191 | if (st.st_dev == execstat.st_dev
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| 192 | && st.st_ino == execstat.st_ino)
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| 193 | return 1;
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| 194 | return 0;
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| 195 | }
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| 196 | #endif
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[821] | 197 |
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[2725] | 198 | static int pid_is_exec(pid_t pid)
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| 199 | {
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| 200 | ssize_t bytes;
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| 201 | char buf[sizeof("/proc/%u/cmdline") + sizeof(int)*3];
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[3232] | 202 | char *procname, *exelink;
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| 203 | int match;
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[2725] | 204 |
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[3232] | 205 | procname = buf + sprintf(buf, "/proc/%u/exe", (unsigned)pid) - 3;
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| 206 |
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| 207 | exelink = xmalloc_readlink(buf);
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| 208 | match = (exelink && strcmp(execname, exelink) == 0);
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| 209 | free(exelink);
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| 210 | if (match)
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| 211 | return match;
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| 212 |
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| 213 | strcpy(procname, "cmdline");
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[2725] | 214 | bytes = open_read_close(buf, G.execname_cmpbuf, G.execname_sizeof);
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| 215 | if (bytes > 0) {
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| 216 | G.execname_cmpbuf[bytes] = '\0';
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| 217 | return strcmp(execname, G.execname_cmpbuf) == 0;
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| 218 | }
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| 219 | return 0;
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[821] | 220 | }
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| 221 |
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[2725] | 222 | static int pid_is_name(pid_t pid)
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[821] | 223 | {
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[2725] | 224 | /* /proc/PID/stat is "PID (comm_15_bytes_max) ..." */
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| 225 | char buf[32]; /* should be enough */
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| 226 | char *p, *pe;
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[821] | 227 |
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[2725] | 228 | sprintf(buf, "/proc/%u/stat", (unsigned)pid);
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| 229 | if (open_read_close(buf, buf, sizeof(buf) - 1) < 0)
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[821] | 230 | return 0;
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[2725] | 231 | buf[sizeof(buf) - 1] = '\0'; /* paranoia */
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| 232 | p = strchr(buf, '(');
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| 233 | if (!p)
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| 234 | return 0;
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| 235 | pe = strrchr(++p, ')');
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| 236 | if (!pe)
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| 237 | return 0;
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| 238 | *pe = '\0';
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| 239 | /* we require comm to match and to not be truncated */
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| 240 | /* in Linux, if comm is 15 chars, it may be a truncated
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| 241 | * name, so we don't allow that to match */
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| 242 | if (strlen(p) >= COMM_LEN - 1) /* COMM_LEN is 16 */
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| 243 | return 0;
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| 244 | return strcmp(p, cmdname) == 0;
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[821] | 245 | }
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| 246 |
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[2725] | 247 | static int pid_is_user(int pid)
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[821] | 248 | {
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[2725] | 249 | struct stat sb;
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| 250 | char buf[sizeof("/proc/") + sizeof(int)*3];
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[821] | 251 |
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[2725] | 252 | sprintf(buf, "/proc/%u", (unsigned)pid);
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| 253 | if (stat(buf, &sb) != 0)
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| 254 | return 0;
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| 255 | return (sb.st_uid == (uid_t)user_id);
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[821] | 256 | }
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| 257 |
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| 258 | static void check(int pid)
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| 259 | {
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[1765] | 260 | struct pid_list *p;
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| 261 |
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[2725] | 262 | if (execname && !pid_is_exec(pid)) {
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[821] | 263 | return;
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| 264 | }
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[2725] | 265 | if (cmdname && !pid_is_name(pid)) {
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[821] | 266 | return;
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| 267 | }
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[2725] | 268 | if (userspec && !pid_is_user(pid)) {
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[821] | 269 | return;
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| 270 | }
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[1765] | 271 | p = xmalloc(sizeof(*p));
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[2725] | 272 | p->next = G.found_procs;
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[1765] | 273 | p->pid = pid;
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[2725] | 274 | G.found_procs = p;
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[821] | 275 | }
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| 276 |
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| 277 | static void do_pidfile(void)
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| 278 | {
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| 279 | FILE *f;
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[1765] | 280 | unsigned pid;
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[821] | 281 |
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[2725] | 282 | f = fopen_for_read(pidfile);
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[821] | 283 | if (f) {
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[1765] | 284 | if (fscanf(f, "%u", &pid) == 1)
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[821] | 285 | check(pid);
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| 286 | fclose(f);
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| 287 | } else if (errno != ENOENT)
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| 288 | bb_perror_msg_and_die("open pidfile %s", pidfile);
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| 289 | }
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| 290 |
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| 291 | static void do_procinit(void)
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| 292 | {
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| 293 | DIR *procdir;
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| 294 | struct dirent *entry;
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[2725] | 295 | int pid;
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[821] | 296 |
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| 297 | if (pidfile) {
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| 298 | do_pidfile();
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| 299 | return;
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| 300 | }
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| 301 |
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[1765] | 302 | procdir = xopendir("/proc");
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[821] | 303 |
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[2725] | 304 | pid = 0;
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| 305 | while (1) {
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| 306 | errno = 0; /* clear any previous error */
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| 307 | entry = readdir(procdir);
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| 308 | // TODO: this check is too generic, it's better
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| 309 | // to check for exact errno(s) which mean that we got stale entry
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| 310 | if (errno) /* Stale entry, process has died after opendir */
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| 311 | continue;
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| 312 | if (!entry) /* EOF, no more entries */
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| 313 | break;
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[1765] | 314 | pid = bb_strtou(entry->d_name, NULL, 10);
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[2725] | 315 | if (errno) /* NaN */
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[821] | 316 | continue;
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| 317 | check(pid);
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| 318 | }
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| 319 | closedir(procdir);
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[2725] | 320 | if (!pid)
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[1765] | 321 | bb_error_msg_and_die("nothing in /proc - not mounted?");
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[821] | 322 | }
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| 323 |
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| 324 | static int do_stop(void)
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| 325 | {
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[1765] | 326 | char *what;
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[821] | 327 | struct pid_list *p;
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| 328 | int killed = 0;
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| 329 |
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[1765] | 330 | if (cmdname) {
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| 331 | if (ENABLE_FEATURE_CLEAN_UP) what = xstrdup(cmdname);
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| 332 | if (!ENABLE_FEATURE_CLEAN_UP) what = cmdname;
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| 333 | } else if (execname) {
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| 334 | if (ENABLE_FEATURE_CLEAN_UP) what = xstrdup(execname);
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| 335 | if (!ENABLE_FEATURE_CLEAN_UP) what = execname;
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[2725] | 336 | } else if (pidfile) {
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[1765] | 337 | what = xasprintf("process in pidfile '%s'", pidfile);
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[2725] | 338 | } else if (userspec) {
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[1765] | 339 | what = xasprintf("process(es) owned by '%s'", userspec);
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[2725] | 340 | } else {
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[1765] | 341 | bb_error_msg_and_die("internal error, please report");
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[2725] | 342 | }
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[821] | 343 |
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[2725] | 344 | if (!G.found_procs) {
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| 345 | if (!QUIET)
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[1765] | 346 | printf("no %s found; none killed\n", what);
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| 347 | killed = -1;
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| 348 | goto ret;
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[821] | 349 | }
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[2725] | 350 | for (p = G.found_procs; p; p = p->next) {
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[3232] | 351 | if (kill(p->pid, TEST ? 0 : signal_nr) == 0) {
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[821] | 352 | killed++;
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| 353 | } else {
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[3232] | 354 | bb_perror_msg("warning: killing process %u", (unsigned)p->pid);
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[2725] | 355 | p->pid = 0;
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[3232] | 356 | if (TEST) {
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| 357 | /* Example: -K --test --pidfile PIDFILE detected
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| 358 | * that PIDFILE's pid doesn't exist */
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| 359 | killed = -1;
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| 360 | goto ret;
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| 361 | }
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[821] | 362 | }
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| 363 | }
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[2725] | 364 | if (!QUIET && killed) {
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[821] | 365 | printf("stopped %s (pid", what);
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[2725] | 366 | for (p = G.found_procs; p; p = p->next)
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| 367 | if (p->pid)
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| 368 | printf(" %u", (unsigned)p->pid);
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[1765] | 369 | puts(")");
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[821] | 370 | }
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[1765] | 371 | ret:
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[821] | 372 | if (ENABLE_FEATURE_CLEAN_UP)
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[1765] | 373 | free(what);
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[821] | 374 | return killed;
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| 375 | }
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| 376 |
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| 377 | #if ENABLE_FEATURE_START_STOP_DAEMON_LONG_OPTIONS
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[1765] | 378 | static const char start_stop_daemon_longopts[] ALIGN1 =
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| 379 | "stop\0" No_argument "K"
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| 380 | "start\0" No_argument "S"
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| 381 | "background\0" No_argument "b"
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| 382 | "quiet\0" No_argument "q"
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[2725] | 383 | "test\0" No_argument "t"
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[1765] | 384 | "make-pidfile\0" No_argument "m"
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[821] | 385 | #if ENABLE_FEATURE_START_STOP_DAEMON_FANCY
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[1765] | 386 | "oknodo\0" No_argument "o"
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| 387 | "verbose\0" No_argument "v"
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| 388 | "nicelevel\0" Required_argument "N"
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[821] | 389 | #endif
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[1765] | 390 | "startas\0" Required_argument "a"
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| 391 | "name\0" Required_argument "n"
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| 392 | "signal\0" Required_argument "s"
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| 393 | "user\0" Required_argument "u"
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| 394 | "chuid\0" Required_argument "c"
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| 395 | "exec\0" Required_argument "x"
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| 396 | "pidfile\0" Required_argument "p"
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[821] | 397 | #if ENABLE_FEATURE_START_STOP_DAEMON_FANCY
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[1765] | 398 | "retry\0" Required_argument "R"
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[821] | 399 | #endif
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[1765] | 400 | ;
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[821] | 401 | #endif
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| 402 |
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[2725] | 403 | int start_stop_daemon_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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| 404 | int start_stop_daemon_main(int argc UNUSED_PARAM, char **argv)
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[821] | 405 | {
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[1765] | 406 | unsigned opt;
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| 407 | char *signame;
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| 408 | char *startas;
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| 409 | char *chuid;
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[2725] | 410 | #ifdef OLDER_VERSION_OF_X
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| 411 | struct stat execstat;
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| 412 | #endif
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[821] | 413 | #if ENABLE_FEATURE_START_STOP_DAEMON_FANCY
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| 414 | // char *retry_arg = NULL;
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| 415 | // int retries = -1;
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[1765] | 416 | char *opt_N;
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[821] | 417 | #endif
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[2725] | 418 |
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| 419 | INIT_G();
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| 420 |
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[821] | 421 | #if ENABLE_FEATURE_START_STOP_DAEMON_LONG_OPTIONS
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[1765] | 422 | applet_long_options = start_stop_daemon_longopts;
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[821] | 423 | #endif
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| 424 |
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[2725] | 425 | /* -K or -S is required; they are mutually exclusive */
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| 426 | /* -p is required if -m is given */
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| 427 | /* -xpun (at least one) is required if -K is given */
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| 428 | /* -xa (at least one) is required if -S is given */
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| 429 | /* -q turns off -v */
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| 430 | opt_complementary = "K:S:K--S:S--K:m?p:K?xpun:S?xa"
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| 431 | IF_FEATURE_START_STOP_DAEMON_FANCY("q-v");
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| 432 | opt = getopt32(argv, "KSbqtma:n:s:u:c:x:p:"
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| 433 | IF_FEATURE_START_STOP_DAEMON_FANCY("ovN:R:"),
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[1765] | 434 | &startas, &cmdname, &signame, &userspec, &chuid, &execname, &pidfile
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[2725] | 435 | IF_FEATURE_START_STOP_DAEMON_FANCY(,&opt_N)
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| 436 | /* We accept and ignore -R <param> / --retry <param> */
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| 437 | IF_FEATURE_START_STOP_DAEMON_FANCY(,NULL)
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[1765] | 438 | );
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[821] | 439 |
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[1765] | 440 | if (opt & OPT_s) {
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| 441 | signal_nr = get_signum(signame);
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| 442 | if (signal_nr < 0) bb_show_usage();
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[821] | 443 | }
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| 444 |
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[1765] | 445 | if (!(opt & OPT_a))
|
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[821] | 446 | startas = execname;
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[2725] | 447 | if (!execname) /* in case -a is given and -x is not */
|
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| 448 | execname = startas;
|
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| 449 | if (execname) {
|
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| 450 | G.execname_sizeof = strlen(execname) + 1;
|
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| 451 | G.execname_cmpbuf = xmalloc(G.execname_sizeof + 1);
|
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| 452 | }
|
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[821] | 453 |
|
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[2725] | 454 | // IF_FEATURE_START_STOP_DAEMON_FANCY(
|
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[821] | 455 | // if (retry_arg)
|
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[2725] | 456 | // retries = xatoi_positive(retry_arg);
|
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[821] | 457 | // )
|
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[2725] | 458 | //argc -= optind;
|
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[821] | 459 | argv += optind;
|
---|
| 460 |
|
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[1765] | 461 | if (userspec) {
|
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| 462 | user_id = bb_strtou(userspec, NULL, 10);
|
---|
| 463 | if (errno)
|
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| 464 | user_id = xuname2uid(userspec);
|
---|
| 465 | }
|
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[2725] | 466 | /* Both start and stop need to know current processes */
|
---|
| 467 | do_procinit();
|
---|
[821] | 468 |
|
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[1765] | 469 | if (opt & CTX_STOP) {
|
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[821] | 470 | int i = do_stop();
|
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[1765] | 471 | return (opt & OPT_OKNODO) ? 0 : (i <= 0);
|
---|
[821] | 472 | }
|
---|
| 473 |
|
---|
[2725] | 474 | if (G.found_procs) {
|
---|
| 475 | if (!QUIET)
|
---|
| 476 | printf("%s is already running\n%u\n", execname, (unsigned)G.found_procs->pid);
|
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[1765] | 477 | return !(opt & OPT_OKNODO);
|
---|
[821] | 478 | }
|
---|
[2725] | 479 |
|
---|
| 480 | #ifdef OLDER_VERSION_OF_X
|
---|
| 481 | if (execname)
|
---|
| 482 | xstat(execname, &execstat);
|
---|
| 483 | #endif
|
---|
| 484 |
|
---|
[821] | 485 | *--argv = startas;
|
---|
[1765] | 486 | if (opt & OPT_BACKGROUND) {
|
---|
| 487 | #if BB_MMU
|
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[3232] | 488 | bb_daemonize(DAEMON_DEVNULL_STDIO + DAEMON_CLOSE_EXTRA_FDS + DAEMON_DOUBLE_FORK);
|
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[2725] | 489 | /* DAEMON_DEVNULL_STDIO is superfluous -
|
---|
| 490 | * it's always done by bb_daemonize() */
|
---|
[1765] | 491 | #else
|
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[2725] | 492 | pid_t pid = xvfork();
|
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[1765] | 493 | if (pid != 0) {
|
---|
| 494 | /* parent */
|
---|
| 495 | /* why _exit? the child may have changed the stack,
|
---|
| 496 | * so "return 0" may do bad things */
|
---|
[2725] | 497 | _exit(EXIT_SUCCESS);
|
---|
[1765] | 498 | }
|
---|
[2725] | 499 | /* Child */
|
---|
[1765] | 500 | setsid(); /* detach from controlling tty */
|
---|
| 501 | /* Redirect stdio to /dev/null, close extra FDs.
|
---|
| 502 | * We do not actually daemonize because of DAEMON_ONLY_SANITIZE */
|
---|
[2725] | 503 | bb_daemonize_or_rexec(DAEMON_DEVNULL_STDIO
|
---|
[1765] | 504 | + DAEMON_CLOSE_EXTRA_FDS
|
---|
| 505 | + DAEMON_ONLY_SANITIZE,
|
---|
| 506 | NULL /* argv, unused */ );
|
---|
| 507 | #endif
|
---|
[821] | 508 | }
|
---|
[1765] | 509 | if (opt & OPT_MAKEPID) {
|
---|
[2725] | 510 | /* User wants _us_ to make the pidfile */
|
---|
[1765] | 511 | write_pidfile(pidfile);
|
---|
[821] | 512 | }
|
---|
[1765] | 513 | if (opt & OPT_c) {
|
---|
[2725] | 514 | struct bb_uidgid_t ugid = { -1, -1 };
|
---|
[1765] | 515 | parse_chown_usergroup_or_die(&ugid, chuid);
|
---|
[3232] | 516 | if (ugid.uid != (uid_t) -1) {
|
---|
| 517 | struct passwd *pw = xgetpwuid(ugid.uid);
|
---|
| 518 | if (ugid.gid != (gid_t) -1)
|
---|
| 519 | pw->pw_gid = ugid.gid;
|
---|
| 520 | /* initgroups, setgid, setuid: */
|
---|
| 521 | change_identity(pw);
|
---|
| 522 | } else if (ugid.gid != (gid_t) -1) {
|
---|
| 523 | xsetgid(ugid.gid);
|
---|
| 524 | setgroups(1, &ugid.gid);
|
---|
| 525 | }
|
---|
[1765] | 526 | }
|
---|
| 527 | #if ENABLE_FEATURE_START_STOP_DAEMON_FANCY
|
---|
| 528 | if (opt & OPT_NICELEVEL) {
|
---|
| 529 | /* Set process priority */
|
---|
| 530 | int prio = getpriority(PRIO_PROCESS, 0) + xatoi_range(opt_N, INT_MIN/2, INT_MAX/2);
|
---|
| 531 | if (setpriority(PRIO_PROCESS, 0, prio) < 0) {
|
---|
| 532 | bb_perror_msg_and_die("setpriority(%d)", prio);
|
---|
| 533 | }
|
---|
| 534 | }
|
---|
| 535 | #endif
|
---|
[2725] | 536 | execvp(startas, argv);
|
---|
| 537 | bb_perror_msg_and_die("can't execute '%s'", startas);
|
---|
[821] | 538 | }
|
---|