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      1 /* dspcrashd.c
      2 **
      3 ** Copyright 2010, The Android Open Source Project
      4 **
      5 ** Redistribution and use in source and binary forms, with or without
      6 ** modification, are permitted provided that the following conditions are met:
      7 **     * Redistributions of source code must retain the above copyright
      8 **       notice, this list of conditions and the following disclaimer.
      9 **     * Redistributions in binary form must reproduce the above copyright
     10 **       notice, this list of conditions and the following disclaimer in the
     11 **       documentation and/or other materials provided with the distribution.
     12 **     * Neither the name of Google Inc. nor the names of its contributors may
     13 **       be used to endorse or promote products derived from this software
     14 **       without specific prior written permission.
     15 **
     16 ** THIS SOFTWARE IS PROVIDED BY Google Inc. ``AS IS'' AND ANY EXPRESS OR
     17 ** IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
     18 ** MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
     19 ** EVENT SHALL Google Inc. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     20 ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     21 ** PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
     22 ** OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
     23 ** WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
     24 ** OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
     25 ** ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     26 */
     27 
     28 #include <stdio.h>
     29 #include <stdlib.h>
     30 #include <unistd.h>
     31 #include <fcntl.h>
     32 #include <errno.h>
     33 #include <time.h>
     34 #include <sys/klog.h>
     35 
     36 #include <cutils/properties.h>
     37 
     38 #define KLOG_BUF_SHIFT	17	/* CONFIG_LOG_BUF_SHIFT from our kernel */
     39 #define KLOG_BUF_LEN	(1 << KLOG_BUF_SHIFT)
     40 
     41 char *props[] = {
     42     "ro.product.name",
     43     "ro.build.id",
     44     "ro.build.date",
     45     "ro.serialno",
     46     "ro.baseband",
     47     0,
     48 };
     49 
     50 char *dashes = "---- ---- ---- ---- ---- ---- ---- ---- ---- ----\n";
     51 
     52 void dump_dmesg(int fd)
     53 {
     54     char buffer[KLOG_BUF_LEN + 1];
     55     char *p = buffer;
     56     ssize_t ret;
     57     int n, op;
     58 
     59     n = klogctl(KLOG_READ_ALL, buffer, KLOG_BUF_LEN);
     60     if (n < 0)
     61         return;
     62     buffer[n] = '\0';
     63 
     64     while((ret = write(fd, p, n))) {
     65         if (ret < 0) {
     66             if (errno == EINTR)
     67                 continue;
     68             return;
     69         }
     70         p += ret;
     71         n -= ret;
     72     }
     73 
     74     return 0;
     75 }
     76 
     77 void dump_info(int fd)
     78 {
     79     char buf[4096];
     80     char val[PROPERTY_VALUE_MAX];
     81     char **p = props;
     82 
     83     write(fd, dashes, strlen(dashes));
     84     while (*p) {
     85         property_get(*p,val,"");
     86         sprintf(buf,"%s: %s\n", *p, val);
     87         write(fd, buf, strlen(buf));
     88         p++;
     89     }
     90     write(fd, dashes, strlen(dashes));
     91     dump_dmesg(fd);
     92     write(fd, dashes, strlen(dashes));
     93 }
     94 
     95 void dump_dsp_state(int dsp)
     96 {
     97     int fd, r;
     98     char name[128];
     99     char buf[128*1024];
    100 
    101     sprintf(name,"/sdcard/dsp.crash.%d.img", (int) time(0));
    102 
    103     fd = open(name, O_CREAT | O_TRUNC | O_WRONLY, 0644);
    104     if (fd < 0)
    105         return;
    106 
    107     for (;;) {
    108         r = read(dsp, buf, sizeof(buf));
    109         if (r == 0) break;
    110         if (r < 0) {
    111             if (errno == EINTR)
    112                 continue;
    113             break;
    114         }
    115         write(fd, buf, r);
    116     }
    117 
    118     dump_info(fd);
    119     close(fd);
    120 
    121     fd = open("/dev/kmsg", O_WRONLY);
    122     if (fd >= 0) {
    123         sprintf(buf,"*** WROTE DSP RAMDUMP TO %s ***\n",name);
    124         write(fd, buf, strlen(buf));
    125         close(fd);
    126     }
    127 }
    128 
    129 int main(int argc, char **argv)
    130 {
    131     int fd;
    132     fd = open("/dev/dsp_debug", O_RDWR);
    133     if (fd < 0)
    134         return -1;
    135 
    136     write(fd, "wait-for-crash", 14);
    137 
    138     dump_dsp_state(fd);
    139 
    140     sync();
    141     sync();
    142     sync();
    143 
    144     write(fd, "continue-crash", 14);
    145 
    146     close(fd);
    147 
    148     for (;;)
    149         sleep(100);
    150 
    151     return 0;
    152 }
    153 
    154