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at timer - remove unused variable
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// at - by Dave Cameron 2013 | |
// A simple timer to run a job at a specific time (in the near future) | |
// compile like: gcc -Os at.c -o at -lrt | |
#include <stdio.h> | |
#include <stdlib.h> | |
#include <time.h> | |
#include <errno.h> | |
#include <err.h> | |
#include <unistd.h> | |
int | |
wait_until(time_t a) | |
{ | |
int r; | |
struct timespec req; | |
req.tv_sec = a; | |
req.tv_nsec = 0; | |
while(r = clock_nanosleep(CLOCK_REALTIME, TIMER_ABSTIME, &req, 0) && r == EINTR); | |
return r; | |
} | |
int | |
at(int h, int m, int s) | |
{ | |
struct tm lt; | |
time_t t, a; | |
time(&t); | |
localtime_r(&t, <); | |
if (h>lt.tm_hour || | |
(h==lt.tm_hour && m>lt.tm_min)) { | |
// same day | |
lt.tm_hour = h; | |
lt.tm_min = m; | |
lt.tm_sec = s; | |
a = mktime(<); | |
} else { | |
// next day | |
lt.tm_hour = h; | |
lt.tm_min = m; | |
lt.tm_sec = s; | |
lt.tm_mday++; | |
a = mktime(<); | |
} | |
return wait_until(a); | |
} | |
void usage(char *arg0) | |
{ | |
fprintf(stderr, "Usage: %s hh:mm[:ss] [action [args]]\n", arg0); | |
fprintf(stderr, "Waits until hh:mm[:ss] today or tomorrow to do action.\n"); | |
exit(1); | |
} | |
int | |
main(int argc, char **argv) | |
{ | |
int n, h, m, s; | |
if(argc<2) usage(argv[0]); | |
m=0; s=0; | |
n = sscanf(argv[1], "%d:%d:%d", &h,&m,&s); | |
if(n<2) { | |
errx(1, "invalid time"); | |
} | |
if(argc==2) { | |
return at(h,m,s); | |
} else { | |
if(!at(h,m,s)) { | |
if(execvp(argv[2], argv + 2)) | |
err(1, "couldn't exec %s", argv[2]); | |
} | |
} | |
} |
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