Johan Herland <johan@xxxxxxxxxxx> writes:
> Maybe I need to do something to the close() call as well? What happens
> on close() after EPIPE?
You should be OK (you could try this).
-- >8 --
#include <stdio.h>
#include <errno.h>
#include <stdlib.h>
#include <signal.h>
#include <string.h>
int main(int ac, char **av)
{
int pipefd[2];
int child;
if (pipe(pipefd) < 0) {
fprintf(stderr, "pipe failed: %s\n", strerror(errno));
exit(1);
}
child = fork();
if (child < 0) {
fprintf(stderr, "fork failed: %s\n", strerror(errno));
exit(1);
} else if (child == 0) {
char buf[1024];
ssize_t sz;
/* the child reads from the parent but does not talk back */
close(pipefd[1]);
/* emulate reading a bit, then dying without cleaning up */
sz = read(pipefd[0], buf, sizeof(buf));
fprintf(stderr, "read %lu bytes, and will die\n",
(unsigned long) sz);
exit(1);
} else {
const char data[] = "abcdefg";
size_t len = sizeof(data);
size_t written = 0;
/* the parent writes to the child but does not listen */
close(pipefd[0]);
/* we will rite to the pipe even after the child is gone */
signal(SIGPIPE, SIG_IGN);
/* write, write, write, ... */
while (1) {
ssize_t sz = write(pipefd[1], data, len);
if (sz < 0) {
/* error */
fprintf(stderr,
"write failed (%s) after writing"
" %lu bytes\n",
strerror(errno),
(unsigned long) written);
break;
}
written += sz;
}
errno = 0;
if (close(pipefd[1]))
fprintf(stderr, "close failed: %s\n", strerror(errno));
else
fprintf(stderr, "close ok\n");
}
exit(0);
}
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