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linux: hand-roll a backtrace printer instead of using backtrace_symbols

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Why?  Because backtrace_symbols calls malloc, which you can't do from a
signal handler.  Face?  Palm.
This commit is contained in:
Adam Jackson 2009-08-19 15:42:34 -04:00
parent 75b9383d8a
commit eb031d4013
1 changed files with 16 additions and 7 deletions
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23
os/backtrace.c
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@ -29,19 +29,28 @@
#include "misc.h"
#ifdef HAVE_BACKTRACE
#define _GNU_SOURCE
#include <dlfcn.h>
#include <execinfo.h>
void xorg_backtrace(void)
{
void *array[32]; /* deeper nesting than this means something's wrong */
void *array[64];
char *mod;
int size, i;
char **strings;
Dl_info info;
ErrorF("\nBacktrace:\n");
size = backtrace(array, 32);
strings = backtrace_symbols(array, size);
for (i = 0; i < size; i++)
ErrorF("%d: %s\n", i, strings[i]);
free(strings);
size = backtrace(array, 64);
for (i = 0; i < size; i++) {
dladdr(array[i], &info);
mod = (info.dli_fname && *info.dli_fname) ? info.dli_fname : "(vdso)";
if (info.dli_saddr)
ErrorF("%d: %s (%s+0x%lx) [%p]\n", i, mod,
info.dli_sname, array[i] - info.dli_saddr, array[i]);
else
ErrorF("%d: %s (%p+0x%lx) [%p]\n", i, mod,
info.dli_fbase, array[i] - info.dli_fbase, array[i]);
}
}
#else /* not glibc or glibc < 2.1 */