mirror of
git://sourceware.org/git/glibc.git
synced 2024-12-09 04:11:27 +08:00
67 lines
1.2 KiB
C
67 lines
1.2 KiB
C
#include <sys/types.h>
|
|
#include <unistd.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
|
|
/* Read characters from the pipe and echo them to @code{stdout}. */
|
|
|
|
void
|
|
read_from_pipe (int file)
|
|
{
|
|
FILE *stream;
|
|
int c;
|
|
stream = fdopen (file, "r");
|
|
while ((c = fgetc (stream)) != EOF)
|
|
putchar (c);
|
|
fclose (stream);
|
|
}
|
|
|
|
/* Write some random text to the pipe. */
|
|
|
|
void
|
|
write_to_pipe (int file)
|
|
{
|
|
FILE *stream;
|
|
stream = fdopen (file, "w");
|
|
fprintf (stream, "hello, world!\n");
|
|
fprintf (stream, "goodbye, world!\n");
|
|
fclose (stream);
|
|
}
|
|
|
|
int
|
|
main (void)
|
|
{
|
|
pid_t pid;
|
|
int mypipe[2];
|
|
|
|
/*@group*/
|
|
/* Create the pipe. */
|
|
if (pipe (mypipe))
|
|
{
|
|
fprintf (stderr, "Pipe failed.\n");
|
|
return EXIT_FAILURE;
|
|
}
|
|
/*@end group*/
|
|
|
|
/* Create the child process. */
|
|
pid = fork ();
|
|
if (pid == (pid_t) 0)
|
|
{
|
|
/* This is the child process. */
|
|
read_from_pipe (mypipe[0]);
|
|
return EXIT_SUCCESS;
|
|
}
|
|
else if (pid < (pid_t) 0)
|
|
{
|
|
/* The fork failed. */
|
|
fprintf (stderr, "Fork failed.\n");
|
|
return EXIT_FAILURE;
|
|
}
|
|
else
|
|
{
|
|
/* This is the parent process. */
|
|
write_to_pipe (mypipe[1]);
|
|
return EXIT_SUCCESS;
|
|
}
|
|
}
|