Named Pipes (FIFO)

First, Named pipes: two unrelated processes are associated by a path name, that is, you can implement interprocess communication (first in, first out) as long as you can access the path.

Second, create the function prototype: int mkfifo (const Char*path, mode_t mode); Successful return 0, failure return-1

Third, the code implementation:

Write End

#include <stdio.h> #include <sys/types.h> #include <sys/stat.h> #include <unistd.h> #include <string.h> #include <fcntl.h> #include <stdlib.h> #define _PATH_ "/tmp/fifo.tmp" #define _size_ 1024int Main () {umask (0); int ret = Mkfifo (_path_, s_ififo|0666), if (ret = =-1) {perror ("Mkfifo"); return 1;} int fd = open (_path_, O_RDWR), if (FD < 0) {perror ("open");} Char Buf[_size_];memset (buf, ' n ', sizeof (BUF)), while (1) {scanf ("%s", buf), int ret = write (FD, buf, strlen (BUF) +1); RET < 0) {perror ("write"); if (strncmp (buf, "Quit", 4) = = 0) {break;}} Close (FD); return 0;}

Read End

#include <stdio.h> #include <sys/types.h> #include <sys/stat.h> #include <unistd.h> #include <string.h> #include <fcntl.h> #include <stdlib.h> #define _PATH_ "/tmp/fifo.tmp" #define _size_ 1024int Main () {int fd = open (_path_, O_RDWR), if (FD < 0) {perror ("open"); return 1;} Char Buf[_size_];memset (buf, ' buf ', sizeof (BUF)), while (1) {int ret = read (FD, buf, sizeof (<=)), if (ret perror 0) {(" Read "); break;} printf ("%s\n", buf); if (strncmp (buf, "Quit", 4) = = 0) {break;}} Close (FD); return 0;}

Iv. Realization of communication:

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Named Pipes (FIFO)