projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| aba4c79c BJ |
1 | static char *sccsid = "@(#)who.c 4.1 (Berkeley) %G%"; |
| 2 | /* | |
| 3 | * who | |
| 4 | */ | |
| 5 | ||
| 6 | #include <stdio.h> | |
| 7 | #include <utmp.h> | |
| 8 | #include <pwd.h> | |
| 9 | ||
| 10 | #define NMAX sizeof(utmp.ut_name) | |
| 11 | #define LMAX sizeof(utmp.ut_line) | |
| 12 | ||
| 13 | struct utmp utmp; | |
| 14 | struct passwd *pw; | |
| 15 | struct passwd *getpwuid(); | |
| 16 | ||
| 17 | char *ttyname(), *rindex(), *ctime(), *strcpy(); | |
| 18 | main(argc, argv) | |
| 19 | char **argv; | |
| 20 | { | |
| 21 | register char *tp, *s; | |
| 22 | register FILE *fi; | |
| 23 | extern char _sobuf[]; | |
| 24 | ||
| 25 | setbuf(stdout, _sobuf); | |
| 26 | s = "/etc/utmp"; | |
| 27 | if(argc == 2) | |
| 28 | s = argv[1]; | |
| 29 | if (argc==3) { | |
| 30 | tp = ttyname(0); | |
| 31 | if (tp) | |
| 32 | tp = rindex(tp, '/') + 1; | |
| 33 | else { /* no tty - use best guess from passwd file */ | |
| 34 | pw = getpwuid(getuid()); | |
| 35 | strcpy(utmp.ut_name, pw?pw->pw_name: "?"); | |
| 36 | strcpy(utmp.ut_line, "tty??"); | |
| 37 | time(&utmp.ut_time); | |
| 38 | putline(); | |
| 39 | exit(0); | |
| 40 | } | |
| 41 | } | |
| 42 | if ((fi = fopen(s, "r")) == NULL) { | |
| 43 | puts("who: cannot open utmp"); | |
| 44 | exit(1); | |
| 45 | } | |
| 46 | while (fread((char *)&utmp, sizeof(utmp), 1, fi) == 1) { | |
| 47 | if(argc==3) { | |
| 48 | if (strcmp(utmp.ut_line, tp)) | |
| 49 | continue; | |
| 50 | #ifdef vax | |
| 51 | printf("(Vax) "); | |
| 52 | #endif | |
| 53 | putline(); | |
| 54 | exit(0); | |
| 55 | } | |
| 56 | if(utmp.ut_name[0] == '\0' && argc==1) | |
| 57 | continue; | |
| 58 | putline(); | |
| 59 | } | |
| 60 | } | |
| 61 | ||
| 62 | putline() | |
| 63 | { | |
| 64 | register char *cbuf; | |
| 65 | ||
| 66 | printf("%-*.*s %-*.*s", NMAX, NMAX, utmp.ut_name, LMAX, LMAX, utmp.ut_line); | |
| 67 | cbuf = ctime(&utmp.ut_time); | |
| 68 | printf("%.12s\n", cbuf+4); | |
| 69 | } |