diff options
Diffstat (limited to 'sysdeps/generic/segfault.c')
| -rw-r--r-- | sysdeps/generic/segfault.c | 55 |
1 files changed, 49 insertions, 6 deletions
diff --git a/sysdeps/generic/segfault.c b/sysdeps/generic/segfault.c index 6504123e18..090f91a657 100644 --- a/sysdeps/generic/segfault.c +++ b/sysdeps/generic/segfault.c @@ -18,16 +18,21 @@ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ +#include <ctype.h> #include <execinfo.h> #include <fcntl.h> #include <signal.h> #include <stdlib.h> +#include <string.h> #include <unistd.h> /* This file defines macros to access the content of the sigcontext element passed up by the signal handler. */ #include <sigcontextinfo.h> +/* Get code to possibly dump the content of all registers. */ +#include <register-dump.h> + /* This is a global variable set at program start time. It marks the highest used stack address. */ extern void *__libc_stack_end; @@ -76,6 +81,8 @@ catch_segfault (int signal, SIGCONTEXT ctx) int fd; void **arr; size_t cnt; + struct sigaction sa; + const char *sigstring; /* This is the name of the file we are writing to. If none is given or we cannot write to this file write to stderr. */ @@ -88,9 +95,17 @@ catch_segfault (int signal, SIGCONTEXT ctx) fd = 2; } -#define WRITE_STRING(s) write (fd, s, sizeof (s) - 1) - WRITE_STRING ("*** Segmentation Fault\n"); - WRITE_STRING ("Backtrace:\n"); +#define WRITE_STRING(s) write (fd, s, strlen (s)) + WRITE_STRING ("*** "); + sigstring = strsignal (signal); + WRITE_STRING (sigstring); + WRITE_STRING ("\n"); + +#ifdef REGISTER_DUMP + REGISTER_DUMP; +#endif + + WRITE_STRING ("\nBacktrace:\n"); top_frame = GET_FRAME (ctx); top_stack = GET_STACK (ctx); @@ -124,8 +139,12 @@ catch_segfault (int signal, SIGCONTEXT ctx) /* Now generate nicely formatted output. */ __backtrace_symbols_fd (arr, cnt, fd); - /* Nothing else to do. */ - _exit (128 + SIGSEGV); + /* Pass on the signal (so that a core file is produced). */ + sa.sa_handler = SIG_DFL; + sigemptyset (&sa.sa_mask); + sa.sa_flags = 0; + sigaction (signal, &sa, NULL); + raise (signal); } @@ -134,12 +153,36 @@ __attribute__ ((constructor)) install_handler (void) { struct sigaction sa; + const char *sigs = getenv ("SEGFAULT_SIGNALS"); sa.sa_handler = (void *) catch_segfault; sigemptyset (&sa.sa_mask); sa.sa_flags = SA_RESTART; - sigaction (SIGSEGV, &sa, NULL); + if (sigs == NULL) + sigaction (SIGSEGV, &sa, NULL); + else if (sigs[0] == '\0') + /* Do not do anything. */ + return; + else + { + const char *where; + int all = __strcasecmp (sigs, "all"); + +#define INSTALL_FOR_SIG(sig, name) \ + where = __strcasestr (sigs, name); \ + if (all || (where != NULL \ + && (where == sigs || !isalnum (where[-1])) \ + && !isalnum (where[sizeof (name) - 1]))) \ + sigaction (sig, &sa, NULL); + + INSTALL_FOR_SIG (SIGSEGV, "segv"); + INSTALL_FOR_SIG (SIGILL, "ill"); + INSTALL_FOR_SIG (SIGBUS, "bus"); + INSTALL_FOR_SIG (SIGSTKFLT, "stkflt"); + INSTALL_FOR_SIG (SIGABRT, "abrt"); + INSTALL_FOR_SIG (SIGFPE, "fpe"); + } /* Maybe we are expected to use an alternative stack. */ if (getenv ("SEGFAULT_USE_ALTSTACK") != 0) |