fbt/sbase
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

Audit time(1)

Browse Source 
1) fix usage().
2) sort includes and comment properly. rename rbeg and rend to r0 and r1.
3) argc style and usage fixes.
4) make error-messages clearer.
5) BUGFIX: It was ignored when fork() failed.
6) Don't call enprintf() after execvp and use _exit instead.
This commit is contained in:
FRIGN 2015-03-05 00:23:09 +01:00
parent a443014e94
commit 1250a8962f
1 changed files with 22 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

37
time.c
View File

@ -11,17 +11,17 @@
static void
usage(void)
{
eprintf("usage: %s [-p] utility [argument ...]\n", argv0);
eprintf("usage: %s [-p] cmd [arg ...]\n", argv0);
}
int
main(int argc, char *argv[])
{
pid_t pid;
struct tms tms; /* hold user and sys times */
clock_t rbeg, rend; /* real time */
long ticks; /* per second */
int status;
struct tms tms; /* user and sys times */
clock_t r0, r1; /* real time */
long ticks; /* per second */
int status, savederrno;
ARGBEGIN {
case 'p':
@ -30,26 +30,33 @@ main(int argc, char *argv[])
usage();
} ARGEND;
if (!*argv)
if (!argc)
usage();
if ((ticks = sysconf(_SC_CLK_TCK)) <= 0)
eprintf("sysconf() failed to retrieve clock ticks per second\n");
eprintf("sysconf _SC_CLK_TCK:");
if ((rbeg = times(&tms)) < 0)
eprintf("times() failed to retrieve start times:");
if ((r0 = times(&tms)) < 0)
eprintf("times:");
if (!(pid = fork())) { /* child */
execvp(*argv, argv);
enprintf(errno == ENOENT ? 127 : 126, "failed to exec %s:", *argv);
switch ((pid = fork())) {
case -1:
eprintf("fork:");
case 0:
execvp(argv[0], argv);
savederrno = errno;
weprintf("exec %s:", argv[0]);
_exit(126 + (savederrno == ENOENT));
default:
break;
}
waitpid(pid, &status, 0);
if ((rend = times(&tms)) < 0)
eprintf("times() failed to retrieve end times:");
if ((r1 = times(&tms)) < 0)
eprintf("times:");
fprintf(stderr, "real %f\nuser %f\nsys %f\n",
(rend - rbeg) / (double)ticks,
(r1 - r0) / (double)ticks,
tms.tms_cutime / (double)ticks,
tms.tms_cstime / (double)ticks);