syslogd.tproj/klog_in.c

   1 /*
   2  * Copyright (c) 2004-2011 Apple 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 <TargetConditionals.h>
  25
  26 #if TARGET_OS_SIMULATOR
  27 struct _not_empty;
  28 #else
  29
  30 #include <sys/types.h>
  31 #include <sys/stat.h>
  32 #include <sys/socket.h>
  33 #include <sys/un.h>
  34 #include <sys/uio.h>
  35 #include <stdio.h>
  36 #include <stdlib.h>
  37 #include <string.h>
  38 #include <fcntl.h>
  39 #include <errno.h>
  40 #include <unistd.h>
  41 #include "daemon.h"
  42
  43 #define forever for(;;)
  44
  45 #define MY_ID "klog_in"
  46 #define BUFF_SIZE 4096
  47
  48 static char inbuf[BUFF_SIZE];
  49 static int bx;
  50 static int kfd = -1;
  51 static dispatch_source_t in_src;
  52 static dispatch_queue_t in_queue;
  53
  54 void
  55 klog_in_acceptdata(int fd)
  56 {
  57         ssize_t len;
  58         uint32_t i;
  59         char *p, *q;
  60         asl_msg_t *m;
  61
  62         len = read(fd, inbuf + bx, BUFF_SIZE - bx);
  63         if (len <= 0) return;
  64
  65         p = inbuf;
  66         q = p + bx;
  67
  68         for (i = 0; i < len; i++, q++)
  69         {
  70                 if (*q == '\n')
  71                 {
  72                         *q = '\0';
  73                         m = asl_input_parse(p, q - p, NULL, SOURCE_KERN);
  74                         process_message(m, SOURCE_KERN);
  75                         p = q + 1;
  76                 }
  77         }
  78
  79         if (p != inbuf)
  80         {
  81                 memmove(inbuf, p, BUFF_SIZE - bx - 1);
  82                 bx = q - p;
  83         }
  84 }
  85
  86 int
  87 klog_in_init()
  88 {
  89         static dispatch_once_t once;
  90
  91         dispatch_once(&once, ^{
  92                 in_queue = dispatch_queue_create(MY_ID, NULL);
  93         });
  94
  95         asldebug("%s: init\n", MY_ID);
  96         if (kfd >= 0) return 0;
  97
  98         kfd = open(_PATH_KLOG, O_RDONLY, 0);
  99         if (kfd < 0)
 100         {
 101                 asldebug("%s: couldn't open %s: %s\n", MY_ID, _PATH_KLOG, strerror(errno));
 102                 return -1;
 103         }
 104
 105         if (fcntl(kfd, F_SETFL, O_NONBLOCK) < 0)
 106         {
 107                 close(kfd);
 108                 kfd = -1;
 109                 asldebug("%s: couldn't set O_NONBLOCK for fd %d (%s): %s\n", MY_ID, kfd, _PATH_KLOG, strerror(errno));
 110                 return -1;
 111         }
 112
 113         in_src = dispatch_source_create(DISPATCH_SOURCE_TYPE_READ, (uintptr_t)kfd, 0, in_queue);
 114         dispatch_source_set_event_handler(in_src, ^{ klog_in_acceptdata(kfd); });
 115
 116         dispatch_resume(in_src);
 117         return 0;
 118 }
 119
 120 int
 121 klog_in_close(void)
 122 {
 123         if (kfd < 0) return 1;
 124
 125         dispatch_source_cancel(in_src);
 126         dispatch_release(in_src);
 127         in_src = NULL;
 128
 129         close(kfd);
 130         kfd = -1;
 131
 132         return 0;
 133 }
 134
 135 int
 136 klog_in_reset(void)
 137 {
 138         return 0;
 139 }
 140
 141 #endif /* !TARGET_OS_SIMULATOR */