syslogd.tproj/klog_in.c

   1 /*
   2  * Copyright (c) 2004 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23
  24 #include <sys/types.h>
  25 #include <sys/stat.h>
  26 #include <sys/socket.h>
  27 #include <sys/un.h>
  28 #include <sys/uio.h>
  29 #include <stdio.h>
  30 #include <stdlib.h>
  31 #include <string.h>
  32 #include <fcntl.h>
  33 #include <errno.h>
  34 #include <unistd.h>
  35 #include "daemon.h"
  36
  37 #define forever for(;;)
  38
  39 #define MY_ID "klog_in"
  40 #define MAXLINE 4096
  41
  42 static int kfd = -1;
  43
  44 static int kx = 0;
  45 static char kline[MAXLINE + 1];
  46
  47 asl_msg_t *
  48 klog_in_acceptmsg(int fd)
  49 {
  50         int n;
  51         char c;
  52
  53         n = read(fd, &c, 1);
  54
  55         while ((n == 1) && (c != '\n'))
  56         {
  57                 if (kx < MAXLINE) kline[kx++] = c;
  58                 n = read(fd, &c, 1);
  59         }
  60
  61         if (kx == 0) return NULL;
  62
  63         n = kx - 1;
  64         kline[kx] = '\0';
  65         kx = 0;
  66
  67         return asl_syslog_input_convert(kline, n, NULL, 1);
  68 }
  69
  70 int
  71 klog_in_init(void)
  72 {
  73         asldebug("%s: init\n", MY_ID);
  74         if (kfd >= 0) return kfd;
  75
  76         kfd = open(_PATH_KLOG, O_RDONLY, 0);
  77         if (kfd < 0)
  78         {
  79                 asldebug("%s: couldn't open %s: %s\n", MY_ID, _PATH_KLOG, strerror(errno));
  80                 return -1;
  81         }
  82
  83         if (fcntl(kfd, F_SETFL, O_NONBLOCK) < 0)
  84         {
  85                 close(kfd);
  86                 kfd = -1;
  87                 asldebug("%s: couldn't set O_NONBLOCK for fd %d (%s): %s\n", MY_ID, kfd, _PATH_KLOG, strerror(errno));
  88                 return -1;
  89         }
  90
  91         return aslevent_addfd(kfd, klog_in_acceptmsg, NULL, NULL);
  92 }
  93
  94 int
  95 klog_in_reset(void)
  96 {
  97         return 0;
  98 }
  99
 100 int
 101 klog_in_close(void)
 102 {
 103         if (kfd < 0) return 1;
 104
 105         close(kfd);
 106         kfd = -1;
 107
 108         return 0;
 109 }