usr/src/usr.sbin/lpr/common_source/startdaemon.c

/*
 * Copyright (c) 1983, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * %sccs.include.redist.c%
 */

#ifndef lint
static char sccsid[] = "@(#)startdaemon.c       8.1 (Berkeley) %G%";
#endif /* not lint */


#include <sys/param.h>
#include <sys/socket.h>
#include <sys/un.h>

#include <dirent.h>
#include <errno.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include "lp.h"
#include "pathnames.h"

static void perr __P((char *));

/*
 * Tell the printer daemon that there are new files in the spool directory.
 */

int
startdaemon(printer)
        char *printer;
{
        struct sockaddr_un un;
        register int s, n;
        char buf[BUFSIZ];

        s = socket(AF_UNIX, SOCK_STREAM, 0);
        if (s < 0) {
                perr("socket");
                return(0);
        }
        un.sun_family = AF_UNIX;
        strcpy(un.sun_path, _PATH_SOCKETNAME);
#ifndef SUN_LEN
#define SUN_LEN(unp) (strlen((unp)->sun_path) + 2)
#endif
        if (connect(s, (struct sockaddr *)&un, SUN_LEN(&un)) < 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);
}

static void
perr(msg)
        char *msg;
{
        extern char *name;

        (void)printf("%s: %s: %s\n", name, msg, strerror(errno));
}