Shulou(Shulou.com)06/02 Report--

Named pipes are designed for communication between unrelated processes

Open (".. / share_fifo", O_RDONLY, 777); this opens a named pipe as read-only, which causes blocking and does not continue to execute open (".. / share_fifo", O_RDONLY | O_NONBLOCK, 777) until other processes are opened for writing. This is opened as read-only and marked as non-blocking, open will not cause blocking, causing the read () function to leave open (fifo,O_WRONLY, 777) after reading the data and then block to other read to open the pipe open (fifo,O_WRONLY | O_NONBLOCK, 777) without blocking, if there is no other read to open the pipe will immediately return an error-1 ENXIO to write a read-free open pipe will produce a signal SIGPIPE You can capture the signal for subsequent processing of this routine, and the function for the communication program between a service process and multiple client processes needs to be perfected one step.

Server.c

# include # define MAXLINE 100pid_t str_handler (char*); void handler_client_corrupt (int); static char* itoa (int); / / because itoa is a non-standard C function, you need to define void del_fifo (void) yourself; / / delete int main () {int fd;int count = 10int BUF_SIZE;pid_t client_id when exiting / / delete the pipeline if (atexit (del_fifo)) {perror ("atexit\ n"); exit (1);} # if 1Take / create a client-to-server shared live pipeline that must not have if (0! = mkfifo (".. / share_fifo", 0777)) {perror ("mkfifo\ n"); exit (1);} fputs ("share_fifo has been created\ n", stdout) # endif// open the pipe and set read-only fd = open (".. / share_fifo", O_RDONLY, S_IRUSR | S_IRGRP | S_IROTH); if (fd PIPE_BUF)? (BUF_SIZE = PIPE_BUF): (BUF_SIZE = MAXLINE); / / the maximum amount of data written into fifo by atomic operations, which will lead to competitive MAXLINE.

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