2.11BSD#431 - /usr/src/bin/who.c

   1: /*
   2:  * Copyright (c) 1980 Regents of the University of California.
   3:  * All rights reserved.  The Berkeley software License Agreement
   4:  * specifies the terms and conditions for redistribution.
   5:  */
   6: 
   7: #if defined(DOSCCS) && !defined(lint)
   8: char copyright[] =
   9: "@(#) Copyright (c) 1980 Regents of the University of California.\n\
  10:  All rights reserved.\n";
  11: 
  12: static char sccsid[] = "@(#)who.c	5.1.3 (2.11BSD GTE) 1997/7/29";
  13: #endif
  14: 
  15: #include <stdio.h>
  16: #include <utmp.h>
  17: #include <pwd.h>
  18: #include <ctype.h>
  19: #include <sys/param.h>  /* for MAXHOSTNAMELEN */
  20: #include <string.h>
  21: #include <time.h>
  22: #include <unistd.h>
  23: 
  24: #define NMAX sizeof(utmp.ut_name)
  25: #define LMAX sizeof(utmp.ut_line)
  26: #define HMAX sizeof(utmp.ut_host)
  27: 
  28: struct  utmp utmp;
  29: struct  passwd *pw;
  30: char    hostname[MAXHOSTNAMELEN];
  31: 
  32: main(argc, argv)
  33:     int argc;
  34:     char **argv;
  35: {
  36:     register char *tp, *s;
  37:     register FILE *fi;
  38: 
  39:     s = _PATH_UTMP;
  40:     if(argc == 2)
  41:         s = argv[1];
  42:     if (argc == 3) {
  43:         tp = ttyname(0);
  44:         if (tp)
  45:             tp = rindex(tp, '/') + 1;
  46:         else {  /* no tty - use best guess from passwd file */
  47:             pw = getpwuid(getuid());
  48:             strncpy(utmp.ut_name, pw ? pw->pw_name : "?", NMAX);
  49:             strcpy(utmp.ut_line, "tty??");
  50:             time(&utmp.ut_time);
  51:             putline();
  52:             exit(0);
  53:         }
  54:     }
  55:     if ((fi = fopen(s, "r")) == NULL) {
  56:         fprintf(stderr, "who: cannot open %s", s);
  57:         exit(1);
  58:     }
  59:     while (fread((char *)&utmp, sizeof(utmp), 1, fi) == 1) {
  60:         if (argc == 3) {
  61:             gethostname(hostname, sizeof (hostname));
  62:             if (strcmp(utmp.ut_line, tp))
  63:                 continue;
  64:             printf("%s!", hostname);
  65:             putline();
  66:             exit(0);
  67:         }
  68:         if (utmp.ut_name[0] == '\0' && argc == 1)
  69:             continue;
  70:         putline();
  71:     }
  72: }
  73: 
  74: putline()
  75: {
  76:     register char *cbuf;
  77: 
  78:     printf("%-*.*s %-*.*s",
  79:         NMAX, NMAX, utmp.ut_name,
  80:         LMAX, LMAX, utmp.ut_line);
  81:     cbuf = ctime(&utmp.ut_time);
  82:     printf("%.12s", cbuf+4);
  83:     if (utmp.ut_host[0])
  84:         printf("\t(%.*s)", HMAX, utmp.ut_host);
  85:     putchar('\n');
  86: }

Defined functions

Defined variables

Defined macros