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- #include <execinfo.h>
- #include <string.h>
- #include <sys/uio.h>
- #include <dlfcn.h>
- #include <stdio.h>
- #include <link.h> /* required for __ELF_NATIVE_CLASS */
- #if __ELF_NATIVE_CLASS == 32
- # define WORD_WIDTH 8
- #else
- # define WORD_WIDTH 16
- #endif
- #define BUF_SIZE (WORD_WIDTH + 1)
- void backtrace_symbols_fd (void *const *array, int size, int fd)
- {
- struct iovec iov[9];
- int cnt;
- for (cnt = 0; cnt < size; ++cnt) {
- char buf[BUF_SIZE];
- Dl_info info;
- size_t last = 0;
- size_t len = 0;
- memset(buf, 0, sizeof(buf));
- if (dladdr (array[cnt], &info)
- && info.dli_fname && info.dli_fname[0] != '\0') {
-
- iov[0].iov_base = (void *) info.dli_fname;
- iov[0].iov_len = strlen (info.dli_fname);
- last = 1;
-
- if (info.dli_sname != NULL) {
- char buf2[BUF_SIZE];
- memset(buf2, 0, sizeof(buf2));
- size_t diff;
- iov[1].iov_base = (void *) "(";
- iov[1].iov_len = 1;
- iov[2].iov_base = (void *) info.dli_sname;
- iov[2].iov_len = strlen (info.dli_sname);
- if (array[cnt] >= (void *) info.dli_saddr) {
- iov[3].iov_base = (void *) "+0x";
- diff = array[cnt] - info.dli_saddr;
- } else {
- iov[3].iov_base = (void *) "-0x";
- diff = info.dli_saddr - array[cnt];
- }
- iov[3].iov_len = 3;
-
- len = snprintf(buf2, sizeof(buf2), "%lx", (unsigned long) diff);
- iov[4].iov_base = buf2;
- iov[4].iov_len = len;
- iov[5].iov_base = (void *) ")";
- iov[5].iov_len = 1;
- last = 6;
- }
- }
- iov[last].iov_base = (void *) "[0x";
- iov[last].iov_len = 3;
- ++last;
-
- len = snprintf(buf, sizeof(buf), "%lx", (unsigned long) array[cnt]);
- iov[last].iov_base = buf;
- iov[last].iov_len = len;
- ++last;
- iov[last].iov_base = (void *) "]\n";
- iov[last].iov_len = 2;
- ++last;
- writev (fd, iov, last);
- }
- }
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