2.11BSD#431 - /usr/src/usr.sbin/lpr/startdaemon.c

   1: /*
   2:  * Copyright (c) 1983 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: static char sccsid[] = "@(#)startdaemon.c	5.1.2 (2.11BSD GTE) 1996/3/22";
   9: #endif
  10: 
  11: /*
  12:  * Tell the printer daemon that there are new files in the spool directory.
  13:  */
  14: 
  15: #include <stdio.h>
  16: #include <sys/errno.h>
  17: #include <sys/signal.h>
  18: #include <sys/types.h>
  19: #include <sys/socket.h>
  20: #include <sys/un.h>
  21: #include "lp.local.h"
  22: 
  23: startdaemon(printer)
  24:     char *printer;
  25: {
  26:     struct sockaddr_un sun;
  27:     register int s, n;
  28:     char buf[BUFSIZ];
  29: 
  30:     s = socket(AF_UNIX, SOCK_STREAM, 0);
  31:     if (s < 0) {
  32:         extern errno;
  33: 
  34:         if (errno == EPROTONOSUPPORT) {
  35:             char current[40];
  36:             char *cp;
  37:             FILE *fp;
  38: 
  39:             if ((fp = fopen(MASTERLOCK, "r")) == NULL) {
  40:                 perr("fopen");
  41:                 return(0);
  42:             }
  43:             cp = current;
  44:             while ((*cp = getc(fp)) != EOF && *cp != '\n')
  45:                 cp++;
  46:             *cp = '\0';
  47:             if (kill(atoi(current), SIGUSR1)) {
  48:                 perr("kill");
  49:                 return(0);
  50:             }
  51:             return(1);
  52:         }
  53:         perr("socket");
  54:         return(0);
  55:     }
  56:     sun.sun_family = AF_UNIX;
  57:     strcpy(sun.sun_path, SOCKETNAME);
  58:     if (connect(s, &sun, strlen(sun.sun_path) + 2) < 0) {
  59:         perr("connect");
  60:         (void) close(s);
  61:         return(0);
  62:     }
  63:     (void) sprintf(buf, "\1%s\n", printer);
  64:     n = strlen(buf);
  65:     if (write(s, buf, n) != n) {
  66:         perr("write");
  67:         (void) close(s);
  68:         return(0);
  69:     }
  70:     if (read(s, buf, 1) == 1) {
  71:         if (buf[0] == '\0') {       /* everything is OK */
  72:             (void) close(s);
  73:             return(1);
  74:         }
  75:         putchar(buf[0]);
  76:     }
  77:     while ((n = read(s, buf, sizeof(buf))) > 0)
  78:         fwrite(buf, 1, n, stdout);
  79:     (void) close(s);
  80:     return(0);
  81: }
  82: 
  83: static
  84: perr(msg)
  85:     char *msg;
  86: {
  87:     extern char *name;
  88: 
  89:     printf("%s: %s: %s\n", name, msg, strerror(errno));
  90: }

Defined functions

Defined variables