diff options
Diffstat (limited to 'src/diag.c')
| -rw-r--r-- | src/diag.c | 19 |
1 files changed, 16 insertions, 3 deletions
@@ -14,13 +14,26 @@ #include <stdarg.h> #include <stdio.h> #include <stdlib.h> +#include <unistd.h> + +/** + * Print an error using dprintf() if possible, because it's more likely to be + * async-signal-safe in practice. + */ +#if BFS_HAS_DPRINTF +# define eprintf(...) dprintf(STDERR_FILENO, __VA_ARGS__) +# define veprintf(...) vdprintf(STDERR_FILENO, __VA_ARGS__) +#else +# define eprintf(...) fprintf(stderr, __VA_ARGS__) +# define veprintf(...) vfprintf(stderr, __VA_ARGS__) +#endif /** bfs_diagf() implementation. */ _printf(2, 0) static void bfs_vdiagf(const struct bfs_loc *loc, const char *format, va_list args) { - fprintf(stderr, "%s: %s@%s:%d: ", xgetprogname(), loc->func, loc->file, loc->line); - vfprintf(stderr, format, args); - fprintf(stderr, "\n"); + eprintf("%s: %s@%s:%d: ", xgetprogname(), loc->func, loc->file, loc->line); + veprintf(format, args); + eprintf("\n"); } void bfs_diagf(const struct bfs_loc *loc, const char *format, ...) { |