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3f6c6d4447
backtrace(3) and execinfo.h are GNU extensions and may or may not be available, and they may be provided via libexecinfo. Fix detection of libexecinfo and allow building without any support of backtrace, in which case we let kernel create core dump. Fixes #116 #117
101 lines
1.8 KiB
C
101 lines
1.8 KiB
C
#ifdef HAVE_EXECINFO_H
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#include <execinfo.h>
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <regex.h>
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#include <signal.h>
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#include "tmate.h"
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#ifndef HAVE_BACKTRACE
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void tmate_print_stack_trace(void) {}
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void tmate_catch_sigsegv(void) {}
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#else
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#if DEBUG
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static int print_resolved_stack_frame(const char *frame)
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{
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char file[100];
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char cmd[200];
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char output[300];
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char address[20];
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char *line;
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FILE *ps;
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static regex_t _regex;
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static regex_t *regex;
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regmatch_t matches[3];
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if (!regex) {
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if (regcomp(&_regex, "(.+)\\(\\) \\[([^]]+)\\]", REG_EXTENDED))
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return -1;
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regex = &_regex;
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}
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if (regexec(regex, frame, 3, matches, 0))
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return -1;
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memcpy(file, &frame[matches[1].rm_so], matches[1].rm_eo - matches[1].rm_so);
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file[matches[1].rm_eo - matches[1].rm_so] = 0;
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memcpy(address, &frame[matches[2].rm_so], matches[2].rm_eo - matches[2].rm_so);
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address[matches[2].rm_eo - matches[2].rm_so] = 0;
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sprintf(cmd, "addr2line -e %s %s -f -p -s", file, address);
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ps = popen(cmd, "r");
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if (!ps)
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return -1;
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line = fgets(output, sizeof(output), ps);
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pclose(ps);
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if (!line)
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return -1;
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line[strlen(line)-1] = 0; /* remove \n */
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tmate_debug("%s(%s) [%s]", file, line, address);
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return 0;
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}
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#endif
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void tmate_print_stack_trace(void)
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{
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void *array[20];
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size_t size;
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char **strings;
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size_t i;
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size = backtrace (array, 20);
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strings = backtrace_symbols (array, size);
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tmate_info ("============ %zd stack frames ============", size);
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for (i = 1; i < size; i++) {
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#if DEBUG
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if (print_resolved_stack_frame(strings[i]) < 0)
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#endif
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tmate_info("%s", strings[i]);
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}
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free (strings);
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}
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static void handle_sigsegv(__unused int sig)
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{
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/* TODO send stack trace to server */
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tmate_info("CRASH, printing stack trace");
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tmate_print_stack_trace();
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tmate_fatal("CRASHED");
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}
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void tmate_catch_sigsegv(void)
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{
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signal(SIGSEGV, handle_sigsegv);
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}
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#endif
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