diff options
Diffstat (limited to 'defs.h')
| -rw-r--r-- | defs.h | 17 |
1 files changed, 17 insertions, 0 deletions
@@ -469,6 +469,23 @@ void error_msg_and_die(const char *fmt, ...) __attribute__ ((noreturn, format(pr void perror_msg_and_die(const char *fmt, ...) __attribute__ ((noreturn, format(printf, 1, 2))); void die_out_of_memory(void) __attribute__ ((noreturn)); +#ifdef USE_CUSTOM_PRINTF +/* + * Speed-optimized vfprintf implementation. + * See comment in vsprintf.c for allowed formats. + * Short version: %h[h]u, %zu, %tu are not allowed, use %[l[l]]u. + * + * It results in strace using about 5% less CPU in user space + * (compared to glibc version). + * But strace spends a lot of time in kernel space, + * so overall it does not appear to be a significant win. + * Thus disabled by default. + */ +int strace_vfprintf(FILE *fp, const char *fmt, va_list args); +#else +# define strace_vfprintf vfprintf +#endif + extern void set_sortby(const char *); extern void set_overhead(int); extern void qualify(const char *); |