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atrun.c
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C/C++ Source or Header
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1990-07-23
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2KB
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54 lines
/* atrun - perform the work 'at' has squirreled away Author: Jan Looyen */
/*-------------------------------------------------------------------------*
* atrun scans directory /usr/spool/at for 'at' jobs to be executed. *
* Finished jobs have been moved to directory /usr/spool/at/past. *
*-------------------------------------------------------------------------*/
#include <sys/types.h>
#include <sys/dir.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <limits.h>
#include <time.h>
#include <stdio.h>
main()
{
int fd, nr;
char realtime[15], procname[35], procpast[35];
struct direct dirbuf;
struct tm *p, *localtime();
struct stat sbuf;
time_t clock;
/*-------------------------------------------------------------------------*
* Compute real time, move 'at' jobs whose filenames < real time to *
* /usr/spool/at/past and start a sh for each job. *
*-------------------------------------------------------------------------*/
time(&clock);
p = localtime(&clock);
sprintf(realtime, "%02d.%03d.%02d%02d.00",
p->tm_year % 100, p->tm_yday, p->tm_hour, p->tm_min);
if ((fd = open("/usr/spool/at", O_RDONLY)) > 0)
while (read(fd, (char *) &dirbuf, sizeof(dirbuf)) > 0)
if (dirbuf.d_ino > 0 &&
dirbuf.d_name[0] != '.' &&
dirbuf.d_name[0] != 'p' &&
strncmp(dirbuf.d_name, realtime, 11) <= 0) {
sprintf(procname, "/usr/spool/at/%.14s", dirbuf.d_name);
sprintf(procpast, "/usr/spool/at/past/%.14s", dirbuf.d_name);
if (fork() == 0) /* code for child */
if (link(procname, procpast) == 0) { /* link ok? */
unlink(procname);
stat(procpast, &sbuf);
setgid(sbuf.st_uid);
setuid(sbuf.st_gid);
execl("/bin/sh", "sh", procpast, (char *) 0);
fprintf(stderr, "proc %s can't start\n", procpast);
exit(1);
}
}
}