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author | Samuel Holland <samuel@sholland.org> | 2018-01-14 21:22:23 -0600 |
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committer | Samuel Holland <samuel@sholland.org> | 2018-01-14 21:26:44 -0600 |
commit | 51fcab754dabef67a26210a6e1cd752290a10749 (patch) | |
tree | c2b4a6ae9dc6eafd2da9b1f90507ece8e03e0beb /libgcompat/backtrace.c | |
parent | 9e0bbd07ef5affa403d476b0bcdabfc5a5684cf9 (diff) | |
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execinfo: Clean up, implement backtrace_symbols_fd
Rename the file to match the header it implements functions from.
Changes to existing code:
* Fix the return value from backtrace (off by one).
* Use __builtin_extract_return_addr as recommended in gcc documentation.
* Document header usage.
* Document where the functions are referenced in the LSB standard.
Signed-off-by: Samuel Holland <samuel@sholland.org>
Diffstat (limited to 'libgcompat/backtrace.c')
-rw-r--r-- | libgcompat/backtrace.c | 51 |
1 files changed, 0 insertions, 51 deletions
diff --git a/libgcompat/backtrace.c b/libgcompat/backtrace.c deleted file mode 100644 index c8ded8b..0000000 --- a/libgcompat/backtrace.c +++ /dev/null @@ -1,51 +0,0 @@ -#include <dlfcn.h> -#include <stddef.h> -#include <stdlib.h> - -#define _frame_level(addr_buf, curr, frame, size) \ - do { \ - if (__builtin_frame_address(frame) != NULL \ - && (curr = __builtin_return_address(frame)) > 0x1000 \ - && frame <= size) { \ - addr_buf[frame] = curr; \ - } else { \ - return size; \ - } \ - } while (0) - -int backtrace(void **addr_buf, int size) -{ - void *curr; - _frame_level(addr_buf, curr, 0, size); - _frame_level(addr_buf, curr, 1, size); - _frame_level(addr_buf, curr, 2, size); - _frame_level(addr_buf, curr, 3, size); - _frame_level(addr_buf, curr, 4, size); - _frame_level(addr_buf, curr, 5, size); - _frame_level(addr_buf, curr, 6, size); - _frame_level(addr_buf, curr, 7, size); - _frame_level(addr_buf, curr, 8, size); - _frame_level(addr_buf, curr, 9, size); - return 9; -} - -char **backtrace_symbols(void *const *addr_buf, int size) -{ - char **result = calloc(sizeof(char *), size); - if (result == NULL) { - return result; - } - - for (int next = 0; next < size; next++) { - Dl_info info; - int err = dladdr(addr_buf[next], &info); - - if (err != 0) { - result[next] = "??:0"; - } else { - result[next] = info.dli_sname; - } - } - - return result; -} |