kaguya
44 lines
718 B
C
44 lines
718 B
C
#include <stdio.h>
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#include <stdlib.h>
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#include <assert.h>
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#include <unistd.h>
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#include <string.h>
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#include <sys/wait.h>
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// Make sure files are flushed on process exit.
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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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perror("pipe");
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return -1;
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}
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pid_t child = fork();
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if (child < 0) {
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perror("fork");
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return -1;
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}
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// This should sit in libc's buffer and be flushed on exit.
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const char *message = "hello world";
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if (child == 0) {
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// Child
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dup2(pipefd[1], STDOUT_FILENO);
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printf("%s", message);
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return 0;
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}
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// Parent
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wait(NULL);
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char buffer[64];
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ssize_t len = read(pipefd[0], buffer, sizeof(buffer));
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assert(len > 0);
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buffer[len] = 0;
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return strcmp(buffer, message) != 0;
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}
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