43 lines
782 B
C
43 lines
782 B
C
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//
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// Written for Computer Networks and Systems lab classes
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// AUTHOR : Sergiusz Warga
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/wait.h>
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#include <unistd.h>
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int main() {
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int pipefd[2];
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if (pipe(pipefd) < 0){
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fprintf(stderr,"Something went wrong!\n");
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return -1;
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}
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int in = 42;
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int out = 0;
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int status;
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pid_t pid;
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pid = fork();
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if (pid == -1) { // If something went wrong.
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perror("Fork: ");
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exit(EXIT_FAILURE);
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}
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if (pid == 0) { // If this is a child process.
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read(pipefd[0], &out, sizeof(out));
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printf("%d\n", out);
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close(pipefd[0]);
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exit(EXIT_SUCCESS);
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}
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write(pipefd[1], &in, sizeof(in));
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wait(&status);
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close(pipefd[1]);
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return 0;
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}
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