66 lines
1.5 KiB
C
66 lines
1.5 KiB
C
#include <sys/types.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <stdlib.h>
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/* Reading some text from the pipe. */
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void
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read_from_pipe (int file)
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{
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FILE *stream;
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int c;
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stream = fdopen (file, "r");
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while ( (c=fgetc(stream)) != EOF)
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putchar(c);
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//while(1==1) printf("%d\n",fgetc(stream));
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fclose (stream);
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}
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/* Writing some text to the pipe. */
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void
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write_to_pipe (int file)
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{
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FILE *stream;
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stream = fdopen (file, "w");
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fprintf (stream, "hello, world!\n");
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fprintf (stream, "goodbye, world!\n");
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fclose (stream);
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}
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int
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main (void)
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{
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pid_t pid;
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int mypipe[2];
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/* Creating unnamed pipe. */
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if (pipe (mypipe))
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{
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fprintf(stderr, "Pipe failed.\n");
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return EXIT_FAILURE;
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}
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/* Creating child process because we need 2 processes to work with the pipe. */
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pid = fork ();
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if (pid == (pid_t) 0)
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{
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/* Child process opens the pipe for reading. */
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printf("child process for reading started\n");
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read_from_pipe (mypipe[0]);
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// write_to_pipe (mypipe[1]);
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close(mypipe[1]);
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printf("child process ended\n");
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return EXIT_SUCCESS;
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}
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else if (pid < (pid_t) 0)
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{
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/* If fork() failed. */
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fprintf(stderr,"Fork failed.\n");
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return EXIT_FAILURE;
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}
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else
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{
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/* Main (parent) process writes some data to the pipe. */
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printf("parent process for writing started\n");
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write_to_pipe (mypipe[1]);
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// read_from_pipe (mypipe[0]);
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printf("parent process ended\n");
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return EXIT_SUCCESS;
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}
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}
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