63 lines
1.1 KiB
C
63 lines
1.1 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <time.h>
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#include <utmp.h>
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#include "util.h"
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static void
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usage(void)
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{
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eprintf("usage: who [-ml]\n");
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}
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int
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main(int argc, char **argv)
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{
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struct utmp usr;
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FILE *ufp;
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char timebuf[sizeof "yyyy-mm-dd hh:mm"];
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char *tty, *ttmp;
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int mflag = 0, lflag = 0;
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time_t t;
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ARGBEGIN {
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case 'm':
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mflag = 1;
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tty = ttyname(STDIN_FILENO);
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if (!tty)
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eprintf("who: stdin:");
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if ((ttmp = strrchr(tty, '/')))
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tty = ttmp+1;
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break;
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case 'l':
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lflag = 1;
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break;
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default:
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usage();
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} ARGEND;
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if (argc > 0)
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usage();
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if (!(ufp = fopen(_PATH_UTMP, "r")))
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eprintf("who: '%s':", _PATH_UTMP);
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while(fread(&usr, sizeof(usr), 1, ufp) == 1) {
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if (!*usr.ut_name || !*usr.ut_line ||
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usr.ut_line[0] == '~')
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continue;
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if (mflag && strcmp(usr.ut_line, tty))
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continue;
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if (strcmp(usr.ut_name, "LOGIN") == lflag)
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continue;
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t = usr.ut_time;
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strftime(timebuf, sizeof timebuf, "%Y-%m-%d %H:%M", localtime(&t));
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printf("%-8s %-12s %-16s\n", usr.ut_name, usr.ut_line, timebuf);
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}
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fclose(ufp);
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return 0;
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}
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