midfavila/ubase
1
0
Fork 0
Code Issues Pull Requests Projects Releases 1 Wiki Activity

Update watch(1) to handle more accurate intervals

Browse Source
This commit is contained in:
sin 2014-11-30 14:03:25 +00:00
parent 4cb108f557
commit 703e18185c
1 changed files with 10 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
watch.c
View File

@ -1,4 +1,5 @@
/* See LICENSE file for copyright and license details. */ /* See LICENSE file for copyright and license details. */
#include <errno.h>
#include <stdio.h> #include <stdio.h>
#include <stdlib.h> #include <stdlib.h>
#include <unistd.h> #include <unistd.h>
@ -15,14 +16,19 @@ int
main(int argc, char *argv[]) main(int argc, char *argv[])
{ {
char cmd[BUFSIZ]; char cmd[BUFSIZ];
int i, interval = 2; char *end;
useconds_t interval = 2 * 1E6;
float period;
int i;
ARGBEGIN { ARGBEGIN {
case 't': case 't':
break; break;
case 'n': case 'n':
/* Only whole seconds for now */ period = strtof(EARGF(usage()), &end);
interval = estrtol(EARGF(usage()), 10); if (*end != '\0' || errno != 0)
eprintf("invalid interval\n");
interval = period * 1E6;
break; break;
default: default:
usage(); usage();
@ -44,7 +50,7 @@ main(int argc, char *argv[])
printf("\x1b[2J\x1b[H"); /* clear */ printf("\x1b[2J\x1b[H"); /* clear */
fflush(NULL); fflush(NULL);
system(cmd); system(cmd);
sleep(interval); usleep(interval);
} }
return 0; return 0;
} }