Changeset 2725 in MondoRescue for branches/2.2.9/mindi-busybox/miscutils/last.c
- Timestamp:
- Feb 25, 2011, 9:26:54 PM (13 years ago)
- File:
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- 1 edited
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branches/2.2.9/mindi-busybox/miscutils/last.c
r1765 r2725 5 5 * Copyright (C) 2003-2004 by Erik Andersen <andersen@codepoet.org> 6 6 * 7 * Licensed under the GPL version 2, see the file LICENSE in this tarball.7 * Licensed under GPLv2, see file LICENSE in this source tree. 8 8 */ 9 9 … … 11 11 #include <utmp.h> 12 12 13 /* NB: ut_name and ut_user are the same field, use only one name (ut_user) 14 * to reduce confusion */ 15 13 16 #ifndef SHUTDOWN_TIME 14 17 # define SHUTDOWN_TIME 254 15 18 #endif 16 19 17 /* Grr... utmp char[] members 20 /* Grr... utmp char[] members do not have to be nul-terminated. 18 21 * Do what we can while still keeping this reasonably small. 19 22 * Note: We are assuming the ut_id[] size is fixed at 4. */ … … 27 30 #endif 28 31 29 int last_main(int argc, char **argv); 30 int last_main(int argc, char **argv) 32 #if EMPTY != 0 || RUN_LVL != 1 || BOOT_TIME != 2 || NEW_TIME != 3 || \ 33 OLD_TIME != 4 34 #error Values for the ut_type field of struct utmp changed 35 #endif 36 37 int last_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; 38 int last_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM) 31 39 { 32 40 struct utmp ut; 33 41 int n, file = STDIN_FILENO; 34 42 time_t t_tmp; 43 off_t pos; 44 static const char _ut_usr[] ALIGN1 = 45 "runlevel\0" "reboot\0" "shutdown\0"; 46 static const char _ut_lin[] ALIGN1 = 47 "~\0" "{\0" "|\0" /* "LOGIN\0" "date\0" */; 48 enum { 49 TYPE_RUN_LVL = RUN_LVL, /* 1 */ 50 TYPE_BOOT_TIME = BOOT_TIME, /* 2 */ 51 TYPE_SHUTDOWN_TIME = SHUTDOWN_TIME 52 }; 53 enum { 54 _TILDE = EMPTY, /* 0 */ 55 TYPE_NEW_TIME, /* NEW_TIME, 3 */ 56 TYPE_OLD_TIME /* OLD_TIME, 4 */ 57 }; 35 58 36 if (arg c > 1) {59 if (argv[1]) { 37 60 bb_show_usage(); 38 61 } 39 62 file = xopen(bb_path_wtmp_file, O_RDONLY); 40 63 41 printf("%-10s %-14s %-18s %-12.12s %s\n", "USER", "TTY", "HOST", "LOGIN", "TIME"); 42 while ((n = safe_read(file, (void*)&ut, sizeof(struct utmp))) != 0) { 43 44 if (n != sizeof(struct utmp)) { 64 printf("%-10s %-14s %-18s %-12.12s %s\n", 65 "USER", "TTY", "HOST", "LOGIN", "TIME"); 66 /* yikes. We reverse over the file and that is a not too elegant way */ 67 pos = xlseek(file, 0, SEEK_END); 68 pos = lseek(file, pos - sizeof(ut), SEEK_SET); 69 while ((n = full_read(file, &ut, sizeof(ut))) > 0) { 70 if (n != sizeof(ut)) { 45 71 bb_perror_msg_and_die("short read"); 46 72 } 47 48 if (ut.ut_line[0] == '~') { 73 n = index_in_strings(_ut_lin, ut.ut_line); 74 if (n == _TILDE) { /* '~' */ 75 #if 1 76 /* do we really need to be cautious here? */ 77 n = index_in_strings(_ut_usr, ut.ut_user); 78 if (++n > 0) 79 ut.ut_type = n != 3 ? n : SHUTDOWN_TIME; 80 #else 49 81 if (strncmp(ut.ut_user, "shutdown", 8) == 0) 50 82 ut.ut_type = SHUTDOWN_TIME; 51 83 else if (strncmp(ut.ut_user, "reboot", 6) == 0) 52 84 ut.ut_type = BOOT_TIME; 53 else if (strncmp(ut.ut_user, "runlevel", 7) == 0)85 else if (strncmp(ut.ut_user, "runlevel", 8) == 0) 54 86 ut.ut_type = RUN_LVL; 87 #endif 55 88 } else { 56 if (!ut.ut_name[0] || strcmp(ut.ut_name, "LOGIN") == 0 || 57 ut.ut_name[0] == 0) 58 { 89 if (ut.ut_user[0] == '\0' || strcmp(ut.ut_user, "LOGIN") == 0) { 59 90 /* Don't bother. This means we can't find how long 60 91 * someone was logged in for. Oh well. */ 61 continue;92 goto next; 62 93 } 63 if (ut.ut_type != DEAD_PROCESS && 64 ut.ut_name[0] && ut.ut_line[0]) 65 { 94 if (ut.ut_type != DEAD_PROCESS 95 && ut.ut_user[0] 96 && ut.ut_line[0] 97 ) { 66 98 ut.ut_type = USER_PROCESS; 67 99 } 68 if (strcmp(ut.ut_name, "date") == 0) { 69 if (ut.ut_line[0] == '|') ut.ut_type = OLD_TIME; 70 if (ut.ut_line[0] == '{') ut.ut_type = NEW_TIME; 100 if (strcmp(ut.ut_user, "date") == 0) { 101 if (n == TYPE_OLD_TIME) { /* '|' */ 102 ut.ut_type = OLD_TIME; 103 } 104 if (n == TYPE_NEW_TIME) { /* '{' */ 105 ut.ut_type = NEW_TIME; 106 } 71 107 } 72 108 } 73 109 74 if (ut.ut_type !=USER_PROCESS) {110 if (ut.ut_type != USER_PROCESS) { 75 111 switch (ut.ut_type) { 76 112 case OLD_TIME: … … 78 114 case RUN_LVL: 79 115 case SHUTDOWN_TIME: 80 continue;116 goto next; 81 117 case BOOT_TIME: 82 118 strcpy(ut.ut_line, "system boot"); 83 break;84 119 } 85 120 } 121 /* manpages say ut_tv.tv_sec *is* time_t, 122 * but some systems have it wrong */ 86 123 t_tmp = (time_t)ut.ut_tv.tv_sec; 87 printf("%-10s %-14s %-18s %-12.12s\n", ut.ut_user, ut.ut_line, ut.ut_host, 88 ctime(&t_tmp) + 4); 124 printf("%-10s %-14s %-18s %-12.12s\n", 125 ut.ut_user, ut.ut_line, ut.ut_host, ctime(&t_tmp) + 4); 126 next: 127 pos -= sizeof(ut); 128 if (pos <= 0) 129 break; /* done. */ 130 xlseek(file, pos, SEEK_SET); 89 131 } 90 132
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