72 lines
1.4 KiB
C
72 lines
1.4 KiB
C
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/* who 1.5 - tell who is currently logged in Author: Kees J. Bot
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* 9 Jul 1989
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*/
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#define nil 0
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#include <sys/types.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/stat.h>
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#include <utmp.h>
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#include <time.h>
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#include <string.h>
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char PATH_UTMP[] = "/etc/utmp";
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char day[] = "SunMonTueWedThuFriSat";
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char month[] = "JanFebMarAprMayJunJulAugSepOctNovDec";
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int main(int argc, char **argv)
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{
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char *tmp= PATH_UTMP;
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FILE *f;
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struct utmp ut;
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struct tm *tm;
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int slot, wtmp= 0, once= 0;
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if (argc > 3) {
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fprintf(stderr, "Usage: who <account-file> | who am i\n");
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exit(1);
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}
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if (argc == 2) {
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tmp= argv[1];
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wtmp= 1;
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}
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if ((f= fopen(tmp, "r")) == nil) {
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fprintf(stderr, "who: can't open %s\n", tmp);
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exit(1);
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}
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if (argc == 3) {
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if ((slot= ttyslot()) < 0) {
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fprintf(stderr, "who: no access to terminal.\n");
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exit(1);
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}
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fseek(f, (off_t) sizeof(ut) * slot, 0);
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once= 1;
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}
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while (fread((char *) &ut, sizeof(ut), 1, f) == 1) {
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if (!wtmp && ut.ut_name[0] == 0) continue;
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tm= localtime(&ut.ut_time);
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printf("%-9.8s %-9.8s %.3s %.3s %2d %02d:%02d",
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ut.ut_name,
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ut.ut_line,
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day + (3 * tm->tm_wday),
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month + (3 * tm->tm_mon),
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tm->tm_mday,
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tm->tm_hour,
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tm->tm_min
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);
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if (ut.ut_host[0] != 0) printf(" (%.*s)",
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(int) sizeof(ut.ut_host), ut.ut_host);
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printf("\n");
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if (once) break;
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}
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exit(0);
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}
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