pipe - 創建管道

內容簡介

#include

int pipe(intfiledes[2]);

描述

pipe() creates a pair of file descriptors, yiibaiing to a pipe inode, and places them in the array yiibaied to byfiledes.filedes[0]is for reading,filedes[1]is for writing.

返回值

On success, zero is returned. On error, -1 is returned, anderrnois set appropriately.

錯誤

標簽

描述

EFAULT

filedes?is not valid.

EMFILE

Too many file descriptors are in use by the process.

ENFILE

The system limit on the total number of open files has been reached.

遵循于

POSIX.1-2001.

實例

The following program creates a pipe, and thenfork(2)s to create a child process. After thefork(2), each process closes the descriptors that it doesn’t need for the pipe (seepipe(7)). The parent then writes the string contained in the program’s command-line argument to the pipe, and the child reads this string a byte at a time from the pipe and echoes it on standard output.

#include

#include

#include

#include

#include

#include

int

main(int argc, char *argv[])

{

int pfd[2];

pid_t cpid;

char buf;

assert(argc == 2);

if (pipe(pfd) == -1) { perror("pipe"); exit(EXIT_FAILURE); }

cpid = fork();

if (cpid == -1) { perror("fork"); exit(EXIT_FAILURE); }

if (cpid == 0) { /* Child reads from pipe */

close(pfd[1]); /* Close unused write end */

while (read(pfd[0], &buf, 1) > 0)

write(STDOUT_FILENO, &buf, 1);

write(STDOUT_FILENO, "

", 1);

close(pfd[0]);

_exit(EXIT_SUCCESS);

} else { /* Parent writes argv[1] to pipe */

close(pfd[0]); /* Close unused read end */

write(pfd[1], argv[1], strlen(argv[1]));

close(pfd[1]); /* Reader will see EOF */

wait(NULL); /* Wait for child */

exit(EXIT_SUCCESS);

}

}

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