mirror of https://github.com/t1meshift/os_labs.git
53 lines
1.1 KiB
C
53 lines
1.1 KiB
C
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <fcntl.h>
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#include <assert.h>
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#include <sys/wait.h>
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// A macro to simplify my life
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#define FORK_TASK(IN_FORK, IN_THIS) { \
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int f = fork(); \
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switch (f) { \
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case -1: perror("fork() returned an error!"); exit(1); \
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case 0: IN_FORK; exit(0); \
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default: IN_THIS; \
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} \
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}
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int main() {
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// Task 8
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printf("\n\nTask 8\n");
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int pipefd[2];
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if (pipe(pipefd) == -1) {
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perror("Couldn't create pipe!");
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exit(1);
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}
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char buff[256];
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FORK_TASK(
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{
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close(pipefd[0]);
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printf("In fork\n");
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dup2(pipefd[1], STDOUT_FILENO);
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snprintf(buff, 256, "Written from fork, pid %d\n", getpid());
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//printf("FORK: Message = %s, Len = %lu\n", buff, strlen(buff));
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write(pipefd[1], buff, strlen(buff));
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close(pipefd[1]);
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},
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{
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wait(NULL);
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close(pipefd[1]);
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printf("Fork responded:\n");
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while (read(pipefd[0], buff, 1) > 0) {
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printf("%c", buff[0]);
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}
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close(pipefd[0]);
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}
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)
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return 0;
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}
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