#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <sys/stat.h>
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#include <libgen.h>
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#include <stdlib.h>
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#define FIFO_FILE1 ".fifo_chat1"
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#define FIFO_FILE2 ".fifo_chat2"
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int g_stop = 0;
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void sig_pipe(int signum)
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{
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if(SIGPIPE == signum)
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{
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printf("get pipe broken signal and let programe exit\n");
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g_stop = 1;
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}
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}
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int main(int argc, char **argv)
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{
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int fdr_fifo;
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int fdw_fifo;
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int rv;
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fd_set rdset;
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char buf[1024];
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int mode = 0;
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if( argc != 2 )
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{
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printf("Usage: %s [0/1]\n", basename(argv[0]));
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printf("This chat program need run twice, 1st time run with [0] and 2nd time with [1]\n");
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return -1;
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}
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mode = atoi(argv[1]);
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if( access(FIFO_FILE1 , F_OK) )
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{
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printf("FIFO file \"%s\" not exist and create it now\n", FIFO_FILE1);
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mkfifo(FIFO_FILE1, 0666);
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}
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if( access(FIFO_FILE2 , F_OK) )
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{
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printf("FIFO file \"%s\" not exist and create it now\n", FIFO_FILE2);
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mkfifo(FIFO_FILE2, 0666);
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}
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signal(SIGPIPE, sig_pipe);
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if( 0 == mode )
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{
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printf("start open '%s' for read and it will blocked untill write endpoint opened...\n", FIFO_FILE1);
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if( (fdr_fifo=open(FIFO_FILE1, O_RDONLY)) < 0 )
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{
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printf("Open fifo[%s] for chat read endpoint failure: %s\n", FIFO_FILE1, strerror(errno));
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return -1;
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}
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printf("start open '%s' for write...\n", FIFO_FILE2);
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if( (fdw_fifo=open(FIFO_FILE2, O_WRONLY)) < 0 )
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{
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printf("Open fifo[%s] for chat write endpoint failure: %s\n", FIFO_FILE2, strerror(errno));
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return -1;
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}
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}
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else
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{
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printf("start open '%s' for write and it will blocked untill read endpoint opened...\n", FIFO_FILE1);
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if( (fdw_fifo=open(FIFO_FILE1, O_WRONLY)) < 0 )
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{
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printf("Open fifo[%s] for chat write endpoint failure: %s\n", FIFO_FILE1, strerror(errno));
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return -1;
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}
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printf("start open '%s' for read...\n", FIFO_FILE2);
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if( (fdr_fifo=open(FIFO_FILE2, O_RDONLY)) < 0 )
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{
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printf("Open fifo[%s] for chat read endpoint failure: %s\n", FIFO_FILE2, strerror(errno));
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return -1;
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}
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}
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printf("start chating with another program now, please input message now: \n");
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while( !g_stop )
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{
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FD_ZERO(&rdset);
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FD_SET(STDIN_FILENO, &rdset);
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FD_SET(fdr_fifo, &rdset);
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rv = select(fdr_fifo+1, &rdset, NULL, NULL, NULL);
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if( rv <= 0 )
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{
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printf("Select get timeout or error: %s\n", strerror(errno));
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continue;
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}
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/* get data arrive from FIFO */
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if( FD_ISSET(fdr_fifo, &rdset) )
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{
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memset(buf, 0, sizeof(buf));
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rv=read(fdr_fifo, buf, sizeof(buf));
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if( rv < 0)
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{
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printf("read data from FIFO get errorr: %s\n", strerror(errno));
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break;
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}
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else if( 0==rv )
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{
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printf("Another side of FIFO get closed and program will exit now\n");
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break;
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}
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printf("<-- %s", buf);
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}
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if( FD_ISSET(STDIN_FILENO, &rdset) )
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{
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memset(buf, 0, sizeof(buf));
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fgets(buf, sizeof(buf), stdin);
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write(fdw_fifo, buf, strlen(buf));
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}
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}
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}
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