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From: K-mart Cashier on 7 Feb 2010 11:43
I have a program that continuously reads in a text file. What I want
to do is have the program exit when I press either ctrl-z or ctrl-c.
Here what I've attempt so far.

[cdalten(a)localhost oakland]$ more feed.c
#include <stdio.h>
#include <stdlib.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>

#include <signal.h>

int
do_loop(void)
{
FILE *fp;
char line[BUFSIZ];
int status;

if ((fp = popen("cat test.txt", "r")) == NULL ) {
fprintf(stderr, "pipe error\n");
exit(1);
}

if ((fgets(line, BUFSIZ, fp)) == NULL) {
fprintf(stderr, "can't open file\n");
}

status = pclose(fp);

printf("Process exited? %s\n", WIFEXITED(status) ? "yes" : "no");
printf("Process status: %d\n", WEXITSTATUS(status));

if (WIFSIGNALED(status) &&
(WTERMSIG(status) == SIGINT || WTERMSIG(status) == SIGQUIT)) {
printf("caught signal %d \n", status);
}

return status;
}

int
main(void) {
fd_set wfds;
struct timeval tv;
int retval;

FD_ZERO(&wfds);
FD_SET(0, &wfds);

tv.tv_sec = 5;
tv.tv_usec = 0;

retval = select(1, NULL, &wfds, NULL, &tv);
while(1) {
if (retval) {
if (do_loop() > 0)
exit(1);
retval = select(1, NULL, &wfds, NULL, &tv);
}
} /*end retval*/

return 0;
}
[cdalten(a)localhost oakland]$ gcc -Wall -Wextra feed.c -o feed

And here is what happens when I run it and then press ctrl-c.

[cdalten(a)localhost oakland]$ ./feed
Process exited? yes
Process status: 0
Process exited? yes
Process status: 0
Process exited? yes
Process status: 0
Process exited? yes
Process status: 0
Process exited? yes
Process status: 0
Process exited? yes
Process status: 0
Process exited? yes
Process status: 0
Process exited? yes
Process status: 0
Process exited? yes
Process status: 0
Process exited? yes
Process status: 0
Process exited? yes
Process status: 0
Process exited? yes
Process status: 0

[cdalten(a)localhost oakland]$

How would I go about trapping ctrl-c/ctrl-z in this case?

Chad
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