ElectronixTM
5cdf8871be
Lab 2 is in fact the first lab in the set of ones we actually do. It's not particularly hard, but consumed some time for me
57 lines
1.6 KiB
C
57 lines
1.6 KiB
C
/*
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* "THE CHEESE-WARE LICENSE" (Revision 1):
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* <ElectronixTM> wrote this file. As long as you retain this notice
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* you can do whatever you want with this stuff. If we meet some day,
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* and you think this stuff is worth it, you can buy me some cheese
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* in return
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*/
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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 <sys/wait.h>
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#include <assert.h>
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#include "common.h"
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#define PROG_PREFIX "father: "
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#define log(fmt, args...) printf(PROG_PREFIX fmt "\n", ##args)
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#define CMD_SIZE 256
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int main(int argc, const char **argv)
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{
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if (argc != 2) {
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log("Wrong program usage. 1 argument shuld be passed - program mode");
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log("%d - wait for child", WAIT_FOR_CHILD);
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log("%d - father doesn't wait for child", DONT_WAIT_FOR_CHILD);
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log("%d - father doesn't wait for child, but child finishes",
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ZOMBIE_PROCESS);
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return EXIT_FAILURE;
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}
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long mode = strtol(argv[1], NULL, 10);
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if (fork() == 0) {
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execl("son", "son", argv[1], NULL);
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}
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char cmd[CMD_SIZE] = {0};
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snprintf(cmd, CMD_SIZE, "ps fx > task_dump-%ld", mode);
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if (mode == WAIT_FOR_CHILD) {
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system(cmd);
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int status = 0;
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int ret = wait(&status);
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if (ret < 0) {
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log("waiting for son ended with error code %d", ret);
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return EXIT_FAILURE;
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}
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} else if (mode == DONT_WAIT_FOR_CHILD) {
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system(cmd);
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} else if (mode == ZOMBIE_PROCESS) {
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sleep(2);
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system(cmd);
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} else {
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log("Invalid argument. No mode correspoiding to %ld", mode);
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return EXIT_FAILURE;
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}
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return EXIT_SUCCESS;
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}
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