60 lines
1.0 KiB
C
60 lines
1.0 KiB
C
/* See LICENSE file for copyright and license details. */
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#include <errno.h>
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#include <paths.h>
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#include <pwd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <utmp.h>
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#include <unistd.h>
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#include "config.h"
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#include "util.h"
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void
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usage(void)
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{
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fputs("last [user]\n", stderr);
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exit(1);
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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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FILE *fp;
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struct utmp ut;
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char *user, *file, *prog;
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time_t t;
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switch (argc) {
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case 1:
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user = NULL;
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break;
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case 2:
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user = argv[1];
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break;
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default:
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usage();
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}
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prog = basename(argv[0]);
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file = (!strcmp(prog, "last")) ? WTMP_PATH : BTMP_PATH;
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if ((fp = fopen(file, "r")) == NULL)
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eprintf("fopen %s:", file);
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while (fread(&ut, sizeof(ut), 1, fp) == 1) {
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if (ut.ut_type != USER_PROCESS ||
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(user && strcmp(user, ut.ut_name))) {
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continue;
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}
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t = ut.ut_time;
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printf("%-8.8s %-8.8s %-16.16s %s",
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ut.ut_user, ut.ut_line, ut.ut_host, ctime(&t));
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}
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if (fclose(fp))
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eprintf("fclose %s:", file);
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return 0;
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}
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