From: Ardhan Madras <nightdecoder@gmail.com>
To: linux-c-programming@vger.kernel.org
Subject: Help on pipe
Date: Fri, 10 Jul 2009 13:22:54 +0700 [thread overview]
Message-ID: <34e1241d0907092322h5aea016cj437168a43ebfe50e@mail.gmail.com> (raw)
Hi,
I'm writing pipe demo:
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>
int main(void)
{
pid_t pid;
int fds[2], ret;
const char *sort = "/usr/bin/sort";
char *argv[2] = { "sort", NULL };
ret = pipe(fds);
if (ret == -1) {
perror("pipe");
return -1;
}
pid = fork();
if (pid == -1) {
perror("fork");
return -1;
}
if (pid == 0) {
int ret;
close(fds[1]);
dup2(fds[0], STDIN_FILENO);
ret = execve(sort, argv, NULL);
if (ret == -1) {
perror("execve");
}
close(fds[0]);
_exit(0);
}
else {
FILE *stream;
close(fds[0]);
stream = fdopen(fds[1], "w");
if (!stream) {
perror("fdopen");
return -1;
}
fprintf(stream, "this\n");
fprintf(stream, "means\n");
fprintf(stream, "war\n");
fflush(stream);
waitpid(pid, &ret, 0);
close(fds[1]);
}
return 0;
}
I want to send parent's data to the child as "sort" input, i don't
know why sort doesn't receive the data. Did i made mistake here?
Thanks before.
next reply other threads:[~2009-07-10 6:22 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-07-10 6:22 Ardhan Madras [this message]
2009-07-10 7:06 ` Help on pipe Michał Nazarewicz
2009-07-10 7:34 ` Ardhan Madras
2009-07-10 17:40 ` Glynn Clements
2009-07-11 3:41 ` David Lee
2009-07-13 6:45 ` Michał Nazarewicz
2009-07-10 7:27 ` David Lee
-- strict thread matches above, loose matches on Subject: below --
2009-07-10 18:21 Ardhan Madras
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