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Sprite 1984 - 1993
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Sprite 1984 - 1993.iso
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src
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cmds
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lpr
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startdaemon.c
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C/C++ Source or Header
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1990-02-16
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/*
* Copyright (c) 1983 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that this notice is preserved and that due credit is given
* to the University of California at Berkeley. The name of the University
* may not be used to endorse or promote products derived from this
* software without specific prior written permission. This software
* is provided ``as is'' without express or implied warranty.
*/
#ifndef lint
static char sccsid[] = "@(#)startdaemon.c 5.2 (Berkeley) 5/5/88";
#endif /* not lint */
/*
* Tell the printer daemon that there are new files in the spool directory.
*/
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/file.h>
#include "lp.local.h"
static perr();
startdaemon(printer)
char *printer;
{
#ifndef sprite
struct sockaddr_un sun;
#endif
register int s, n;
char buf[BUFSIZ];
#ifdef sprite
gethostname(buf, sizeof(buf));
sprintf(pdevName, "/hosts/%s/dev/printer", buf);
s = open (pdevName, O_WRONLY, 0);
if (s < 0) {
perror(pdevName);
/*
* the daemon may be dead, so we attempt to start up a new one
*/
switch (fork()) {
case 0:
fprintf(stderr, "attempting to restart lpd\n");
execl("/sprite/daemons.$MACHINE/lpd", "lpd", 0);
perror("exec failed");
return 0;
case -1:
perror("cannot fork");
return 0;
default:
/* loop while we wait for the daemon to start up */
for (n = 60; --n >= 0;) {
sleep(1);
if ((s = open (pdevName, O_WRONLY, 0)) >= 0)
break;
}
if (s < 0)
return 0;
fprintf(stderr, "lpd restarted\n");
break;
}
}
(void) sprintf(buf, "\1%s\n", printer);
n = strlen(buf);
if (write(s, buf, n) != n) {
perr("write");
(void) close(s);
return(0);
}
(void) close(s);
return(1);
#else
s = socket(AF_UNIX, SOCK_STREAM, 0);
if (s < 0) {
perr("socket");
return(0);
}
sun.sun_family = AF_UNIX;
strcpy(sun.sun_path, SOCKETNAME);
if (connect(s, &sun, strlen(sun.sun_path) + 2) < 0) {
perr("connect");
(void) close(s);
return(0);
}
(void) sprintf(buf, "\1%s\n", printer);
n = strlen(buf);
if (write(s, buf, n) != n) {
perr("write");
(void) close(s);
return(0);
}
if (read(s, buf, 1) == 1) {
if (buf[0] == '\0') { /* everything is OK */
(void) close(s);
return(1);
}
putchar(buf[0]);
}
while ((n = read(s, buf, sizeof(buf))) > 0)
fwrite(buf, 1, n, stdout);
(void) close(s);
return(0);
#endif
}
static
perr(msg)
char *msg;
{
extern char *name;
extern int sys_nerr;
extern char *sys_errlist[];
extern int errno;
printf("%s: %s: ", name, msg);
fputs(errno < sys_nerr ? sys_errlist[errno] : "Unknown error" , stdout);
putchar('\n');
}