| 1 | #include <errno.h> |
| 2 | #include <stdarg.h> |
| 3 | #include <stdio.h> |
| 4 | #include <stdlib.h> |
| 5 | #include <string.h> |
| 6 | #include <time.h> |
| 7 | |
| 8 | #include <unistd.h> |
| 9 | #include <sys/resource.h> |
| 10 | #include <sys/time.h> |
| 11 | #include <sys/wait.h> |
| 12 | |
| 13 | static const char *progname = "timeit"; |
| 14 | |
| 15 | static void set_progname(const char *prog) |
| 16 | { |
| 17 | const char *p; |
| 18 | |
| 19 | p = strrchr(prog, '/'); |
| 20 | progname = p ? p + 1 : progname; |
| 21 | } |
| 22 | |
| 23 | static void lose(const char *msg, ...) |
| 24 | { |
| 25 | va_list ap; |
| 26 | |
| 27 | va_start(ap, msg); |
| 28 | fprintf(stderr, "%s: ", progname); |
| 29 | vfprintf(stderr, msg, ap); |
| 30 | fputc('\n', stderr); |
| 31 | va_end(ap); |
| 32 | exit(127); |
| 33 | } |
| 34 | |
| 35 | static double timeval_to_float(const struct timeval *tv) |
| 36 | { return (tv->tv_sec + tv->tv_usec*1e-6); } |
| 37 | |
| 38 | int main(int argc, char *argv[]) |
| 39 | { |
| 40 | struct rusage ru; |
| 41 | struct timeval t0, t1, t; |
| 42 | pid_t kid; |
| 43 | int i, st; |
| 44 | |
| 45 | set_progname(argv[0]); |
| 46 | gettimeofday(&t0, 0); |
| 47 | kid = fork(); if (kid < 0) lose("fork failed: %s", strerror(errno)); |
| 48 | if (!kid) { |
| 49 | execvp(argv[1], argv + 1); |
| 50 | lose("exec (`%s') failed: %s", argv[1], strerror(errno)); |
| 51 | } |
| 52 | if (wait4(kid, &st, 0, &ru) < 0) lose("wait failed: %s", strerror(errno)); |
| 53 | gettimeofday(&t1, 0); |
| 54 | if (st) { |
| 55 | if (WIFSIGNALED(st)) |
| 56 | lose("program killed by signal %d\n", WTERMSIG(st)); |
| 57 | else if (WIFEXITED(st)) |
| 58 | lose("program failed with status %d\n", WEXITSTATUS(st)); |
| 59 | else |
| 60 | lose("program exited with incomprehensible status 0x%04x\n", st); |
| 61 | } |
| 62 | |
| 63 | if (t0.tv_usec > t1.tv_usec) { |
| 64 | t.tv_sec = t1.tv_sec - t0.tv_sec - 1; |
| 65 | t.tv_usec = t1.tv_usec + 1000000 - t0.tv_usec; |
| 66 | } else { |
| 67 | t.tv_sec = t1.tv_sec - t0.tv_sec; |
| 68 | t.tv_usec = t1.tv_usec - t0.tv_usec; |
| 69 | } |
| 70 | |
| 71 | for (i = 1; i < argc; i++) { |
| 72 | if (i > 1) fputc(' ', stderr); |
| 73 | fputs(argv[i], stderr); |
| 74 | } |
| 75 | fprintf(stderr, ": elapsed = %.4fs; user = %.4fs; system = %.4fs\n", |
| 76 | timeval_to_float(&t), |
| 77 | timeval_to_float(&ru.ru_utime), |
| 78 | timeval_to_float(&ru.ru_stime)); |
| 79 | return (0); |
| 80 | } |