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Log the thread id and name for fatal signals.

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This adds the thread id and name to the "Fatal signal" logging,
making it easier to track down where in process it actually crashed.

Change-Id: I17a365042b2f10b161debe98bc2e7070af055dfb
This commit is contained in:
Marco Nelissen 2012-03-07 09:04:18 -08:00
parent 4597687335
commit 3df3e672f5
1 changed files with 13 additions and 2 deletions
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15
linker/debugger.c
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@ -32,6 +32,7 @@
#include <ctype.h>
#include <signal.h>
#include <sys/mman.h>
#include <sys/prctl.h>
#include <errno.h>
#include "linker.h"
@ -46,6 +47,8 @@ void notify_gdb_of_libraries();
ret = (cond); \
} while (ret < 0 && errno == EINTR)
// see man(2) prctl, specifically the section about PR_GET_NAME
#define MAX_TASK_NAME_LEN (16)
static int socket_abstract_client(const char *name, int type)
{
@ -100,6 +103,7 @@ static int socket_abstract_client(const char *name, int type)
static void logSignalSummary(int signum, const siginfo_t* info)
{
char buffer[128];
char threadname[MAX_TASK_NAME_LEN + 1]; // one more for termination
char* signame;
switch (signum) {
@ -113,9 +117,16 @@ static void logSignalSummary(int signum, const siginfo_t* info)
default: signame = "???"; break;
}
if (prctl(PR_GET_NAME, (unsigned long)threadname, 0, 0, 0) != 0) {
strcpy(threadname, "<name unknown>");
} else {
// short names are null terminated by prctl, but the manpage
// implies that 16 byte names are not.
threadname[MAX_TASK_NAME_LEN] = 0;
}
format_buffer(buffer, sizeof(buffer),
"Fatal signal %d (%s) at 0x%08x (code=%d)",
signum, signame, info->si_addr, info->si_code);
"Fatal signal %d (%s) at 0x%08x (code=%d), thread %d (%s)",
signum, signame, info->si_addr, info->si_code, gettid(), threadname);
__libc_android_log_write(ANDROID_LOG_FATAL, "libc", buffer);
}