syslogd.tproj/klog_in.c

   1 /*
   2  * Copyright (c) 2004 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * "Portions Copyright (c) 2004 Apple Computer, Inc.  All Rights
   7  * Reserved.  This file contains Original Code and/or Modifications of
   8  * Original Code as defined in and that are subject to the Apple Public
   9  * Source License Version 1.0 (the 'License').  You may not use this file
  10  * except in compliance with the License.  Please obtain a copy of the
  11  * License at http://www.apple.com/publicsource and read it before using
  12  * this file.
  13  *
  14  * The Original Code and all software distributed under the License are
  15  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  16  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  17  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  19  * License for the specific language governing rights and limitations
  20  * under the License."
  21  *
  22  * @APPLE_LICENSE_HEADER_END@
  23  */
  24
  25 #include <sys/types.h>
  26 #include <sys/stat.h>
  27 #include <sys/socket.h>
  28 #include <sys/un.h>
  29 #include <sys/uio.h>
  30 #include <stdio.h>
  31 #include <stdlib.h>
  32 #include <string.h>
  33 #include <fcntl.h>
  34 #include <errno.h>
  35 #include <unistd.h>
  36 #include "daemon.h"
  37
  38 #define forever for(;;)
  39
  40 #define MY_ID "klog_in"
  41 #define MAXLINE 4096
  42
  43 static int kfd = -1;
  44
  45 static int kx = 0;
  46 static char kline[MAXLINE + 1];
  47
  48 asl_msg_t *
  49 klog_in_acceptmsg(int fd)
  50 {
  51         int n;
  52         char c;
  53
  54         n = read(fd, &c, 1);
  55
  56         while ((n == 1) && (c != '\n'))
  57         {
  58                 if (kx < MAXLINE) kline[kx++] = c;
  59                 n = read(fd, &c, 1);
  60         }
  61
  62         if (kx == 0) return NULL;
  63
  64         n = kx - 1;
  65         kline[kx] = '\0';
  66         kx = 0;
  67
  68         return asl_syslog_input_convert(kline, n, NULL, 1);
  69 }
  70
  71 int
  72 klog_in_init(void)
  73 {
  74         asldebug("%s: init\n", MY_ID);
  75         if (kfd >= 0) return kfd;
  76
  77         kfd = open(_PATH_KLOG, O_RDONLY, 0);
  78         if (kfd < 0)
  79         {
  80                 asldebug("%s: couldn't open %s: %s\n", MY_ID, _PATH_KLOG, strerror(errno));
  81                 return -1;
  82         }
  83
  84         if (fcntl(kfd, F_SETFL, O_NONBLOCK) < 0)
  85         {
  86                 close(kfd);
  87                 kfd = -1;
  88                 asldebug("%s: couldn't set O_NONBLOCK for fd %d (%s): %s\n", MY_ID, kfd, _PATH_KLOG, strerror(errno));
  89                 return -1;
  90         }
  91
  92         return aslevent_addfd(kfd, klog_in_acceptmsg, NULL, NULL);
  93 }
  94
  95 int
  96 klog_in_reset(void)
  97 {
  98         return 0;
  99 }
 100
 101 int
 102 klog_in_close(void)
 103 {
 104         if (kfd < 0) return 1;
 105
 106         close(kfd);
 107         kfd = -1;
 108
 109         return 0;
 110 }