| 1 | /* |
| 2 | * who |
| 3 | */ |
| 4 | |
| 5 | #include <stdio.h> |
| 6 | #include <utmp.h> |
| 7 | #include <pwd.h> |
| 8 | struct utmp utmp; |
| 9 | struct passwd *pw; |
| 10 | struct passwd *getpwuid(); |
| 11 | |
| 12 | char *ttyname(), *rindex(), *ctime(), *strcpy(); |
| 13 | main(argc, argv) |
| 14 | char **argv; |
| 15 | { |
| 16 | register char *tp, *s; |
| 17 | register FILE *fi; |
| 18 | |
| 19 | s = "/etc/utmp"; |
| 20 | if(argc == 2) |
| 21 | s = argv[1]; |
| 22 | if (argc==3) { |
| 23 | tp = ttyname(0); |
| 24 | if (tp) |
| 25 | tp = rindex(tp, '/') + 1; |
| 26 | else { /* no tty - use best guess from passwd file */ |
| 27 | pw = getpwuid(getuid()); |
| 28 | strcpy(utmp.ut_name, pw?pw->pw_name: "?"); |
| 29 | strcpy(utmp.ut_line, "tty??"); |
| 30 | time(&utmp.ut_time); |
| 31 | putline(); |
| 32 | exit(0); |
| 33 | } |
| 34 | } |
| 35 | if ((fi = fopen(s, "r")) == NULL) { |
| 36 | puts("who: cannot open utmp"); |
| 37 | exit(1); |
| 38 | } |
| 39 | while (fread((char *)&utmp, sizeof(utmp), 1, fi) == 1) { |
| 40 | if(argc==3) { |
| 41 | if (strcmp(utmp.ut_line, tp)) |
| 42 | continue; |
| 43 | #ifdef vax |
| 44 | printf("(Vax) "); |
| 45 | #endif |
| 46 | putline(); |
| 47 | exit(0); |
| 48 | } |
| 49 | if(utmp.ut_name[0] == '\0' && argc==1) |
| 50 | continue; |
| 51 | putline(); |
| 52 | } |
| 53 | } |
| 54 | |
| 55 | putline() |
| 56 | { |
| 57 | register char *cbuf; |
| 58 | |
| 59 | printf("%-8.8s %-8.8s", utmp.ut_name, utmp.ut_line); |
| 60 | cbuf = ctime(&utmp.ut_time); |
| 61 | printf("%.12s\n", cbuf+4); |
| 62 | } |