75 lines
1.6 KiB
C
Executable File
75 lines
1.6 KiB
C
Executable File
#include <stdio.h>
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#include <unistd.h>
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#include <wait.h>
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#include <time.h>
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#include <sys/types.h>
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enum
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{
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YEAR_OFFSET = 1900
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};
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int
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main(void)
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{
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int fd[2];
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pipe(fd);
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time_t delta;
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struct tm *dt;
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pid_t pid = fork();
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if (pid == 0) {
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pid = fork();
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if (pid == 0) {
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pid = fork();
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if (pid == 0) {
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close(fd[0]);
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delta = time(NULL);
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if (write(fd[1], &delta, sizeof(delta)) == -1 || write(fd[1], &delta, sizeof(delta)) == -1 ||
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write(fd[1], &delta, sizeof(delta)) == -1) {
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_exit(1);
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}
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} else if (pid == -1) {
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_exit(1);
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}
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close(fd[1]);
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wait(NULL);
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if (read(fd[0], &delta, sizeof(delta)) == -1) {
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_exit(1);
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}
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dt = localtime(&delta);
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printf("D:%02d\n", dt->tm_mday);
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fflush(stdout);
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_exit(0);
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} else if (pid == -1) {
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_exit(1);
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}
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close(fd[1]);
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wait(NULL);
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if (read(fd[0], &delta, sizeof(delta)) == -1) {
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_exit(1);
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}
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dt = localtime(&delta);
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printf("M:%02d\n", dt->tm_mon + 1);
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fflush(stdout);
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_exit(0);
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} else if (pid == -1) {
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_exit(1);
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}
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close(fd[1]);
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wait(NULL);
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if (read(fd[0], &delta, sizeof(delta)) == -1) {
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_exit(1);
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}
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dt = localtime(&delta);
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printf("Y:%04d\n", dt->tm_year + YEAR_OFFSET);
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fflush(stdout);
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return 0;
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}
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