[821] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * Utility routines.
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| 4 | *
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| 5 | * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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| 6 | *
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[1770] | 7 | * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
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[821] | 8 | */
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| 9 |
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| 10 | #include "libbb.h"
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| 11 |
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[1770] | 12 | /*
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| 13 | In Linux we have three ways to determine "process name":
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| 14 | 1. /proc/PID/stat has "...(name)...", among other things. It's so-called "comm" field.
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| 15 | 2. /proc/PID/cmdline's first NUL-terminated string. It's argv[0] from exec syscall.
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| 16 | 3. /proc/PID/exe symlink. Points to the running executable file.
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| 17 |
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| 18 | kernel threads:
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| 19 | comm: thread name
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| 20 | cmdline: empty
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| 21 | exe: <readlink fails>
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| 22 |
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| 23 | executable
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| 24 | comm: first 15 chars of base name
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| 25 | (if executable is a symlink, then first 15 chars of symlink name are used)
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| 26 | cmdline: argv[0] from exec syscall
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| 27 | exe: points to executable (resolves symlink, unlike comm)
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| 28 |
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| 29 | script (an executable with #!/path/to/interpreter):
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| 30 | comm: first 15 chars of script's base name (symlinks are not resolved)
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| 31 | cmdline: /path/to/interpreter (symlinks are not resolved)
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| 32 | (script name is in argv[1], args are pushed into argv[2] etc)
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| 33 | exe: points to interpreter's executable (symlinks are resolved)
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| 34 |
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| 35 | If FEATURE_PREFER_APPLETS=y (and more so if FEATURE_SH_STANDALONE=y),
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| 36 | some commands started from busybox shell, xargs or find are started by
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| 37 | execXXX("/proc/self/exe", applet_name, params....)
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| 38 | and therefore comm field contains "exe".
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| 39 | */
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| 40 |
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[821] | 41 | /* find_pid_by_name()
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| 42 | *
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| 43 | * Modified by Vladimir Oleynik for use with libbb/procps.c
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| 44 | * This finds the pid of the specified process.
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| 45 | * Currently, it's implemented by rummaging through
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| 46 | * the proc filesystem.
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| 47 | *
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| 48 | * Returns a list of all matching PIDs
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| 49 | * It is the caller's duty to free the returned pidlist.
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| 50 | */
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[1770] | 51 | pid_t* find_pid_by_name(const char* procName)
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[821] | 52 | {
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[1770] | 53 | pid_t* pidList;
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| 54 | int i = 0;
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| 55 | procps_status_t* p = NULL;
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[821] | 56 |
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[1770] | 57 | pidList = xmalloc(sizeof(*pidList));
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| 58 | while ((p = procps_scan(p, PSSCAN_PID|PSSCAN_COMM|PSSCAN_ARGV0))) {
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| 59 | if (
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| 60 | /* we require comm to match and to not be truncated */
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| 61 | /* in Linux, if comm is 15 chars, it may be a truncated
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| 62 | * name, so we don't allow that to match */
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| 63 | (!p->comm[sizeof(p->comm)-2] && strcmp(p->comm, procName) == 0)
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| 64 | /* or we require argv0 to match (essential for matching reexeced /proc/self/exe)*/
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| 65 | || (p->argv0 && strcmp(bb_basename(p->argv0), procName) == 0)
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| 66 | /* TOOD: we can also try exe, do we want that? */
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| 67 | ) {
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| 68 | pidList = xrealloc(pidList, sizeof(*pidList) * (i+2));
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| 69 | pidList[i++] = p->pid;
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[821] | 70 | }
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| 71 | }
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| 72 |
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[1770] | 73 | pidList[i] = 0;
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[821] | 74 | return pidList;
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| 75 | }
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| 76 |
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[1770] | 77 | pid_t *pidlist_reverse(pid_t *pidList)
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[821] | 78 | {
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[1770] | 79 | int i = 0;
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| 80 | while (pidList[i])
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| 81 | i++;
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| 82 | if (--i >= 0) {
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| 83 | pid_t k;
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[821] | 84 | int j;
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| 85 | for (j = 0; i > j; i--, j++) {
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| 86 | k = pidList[i];
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| 87 | pidList[i] = pidList[j];
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| 88 | pidList[j] = k;
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| 89 | }
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| 90 | }
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| 91 | return pidList;
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| 92 | }
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