diff options
Diffstat (limited to 'miscutils/last.c')
-rw-r--r-- | miscutils/last.c | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/miscutils/last.c b/miscutils/last.c new file mode 100644 index 000000000..668f0c17d --- /dev/null +++ b/miscutils/last.c @@ -0,0 +1,91 @@ +/* vi: set sw=4 ts=4: */ +/* + * last implementation for busybox + * + * Copyright (C) 2003-2004 by Erik Andersen <andersen@codepoet.org> + * + * Licensed under the GPL version 2, see the file LICENSE in this tarball. + */ + +#include "busybox.h" +#include <utmp.h> + +#ifndef SHUTDOWN_TIME +# define SHUTDOWN_TIME 254 +#endif + +/* Grr... utmp char[] members do not have to be nul-terminated. + * Do what we can while still keeping this reasonably small. + * Note: We are assuming the ut_id[] size is fixed at 4. */ + +#if defined UT_LINESIZE \ + && ((UT_LINESIZE != 32) || (UT_NAMESIZE != 32) || (UT_HOSTSIZE != 256)) +#error struct utmp member char[] size(s) have changed! +#elif defined __UT_LINESIZE \ + && ((__UT_LINESIZE != 32) || (__UT_NAMESIZE != 64) || (__UT_HOSTSIZE != 256)) +#error struct utmp member char[] size(s) have changed! +#endif + +int last_main(int argc, char **argv) +{ + struct utmp ut; + int n, file = STDIN_FILENO; + time_t t_tmp; + + if (argc > 1) { + bb_show_usage(); + } + file = xopen(bb_path_wtmp_file, O_RDONLY); + + printf("%-10s %-14s %-18s %-12.12s %s\n", "USER", "TTY", "HOST", "LOGIN", "TIME"); + while ((n = safe_read(file, (void*)&ut, sizeof(struct utmp))) != 0) { + + if (n != sizeof(struct utmp)) { + bb_perror_msg_and_die("short read"); + } + + if (strncmp(ut.ut_line, "~", 1) == 0) { + if (strncmp(ut.ut_user, "shutdown", 8) == 0) + ut.ut_type = SHUTDOWN_TIME; + else if (strncmp(ut.ut_user, "reboot", 6) == 0) + ut.ut_type = BOOT_TIME; + else if (strncmp(ut.ut_user, "runlevel", 7) == 0) + ut.ut_type = RUN_LVL; + } else { + if (!ut.ut_name[0] || strcmp(ut.ut_name, "LOGIN") == 0 || + ut.ut_name[0] == 0) + { + /* Don't bother. This means we can't find how long + * someone was logged in for. Oh well. */ + continue; + } + if (ut.ut_type != DEAD_PROCESS && + ut.ut_name[0] && ut.ut_line[0]) + { + ut.ut_type = USER_PROCESS; + } + if (strcmp(ut.ut_name, "date") == 0) { + if (ut.ut_line[0] == '|') ut.ut_type = OLD_TIME; + if (ut.ut_line[0] == '{') ut.ut_type = NEW_TIME; + } + } + + if (ut.ut_type!=USER_PROCESS) { + switch (ut.ut_type) { + case OLD_TIME: + case NEW_TIME: + case RUN_LVL: + case SHUTDOWN_TIME: + continue; + case BOOT_TIME: + strcpy(ut.ut_line, "system boot"); + break; + } + } + t_tmp = (time_t)ut.ut_tv.tv_sec; + printf("%-10s %-14s %-18s %-12.12s\n", ut.ut_user, ut.ut_line, ut.ut_host, + ctime(&t_tmp) + 4); + } + + fflush_stdout_and_exit(EXIT_SUCCESS); +} |