Enrico Fraccaroli
66 lines
1.4 KiB
C
66 lines
1.4 KiB
C
/// @file t_fork.c
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/// @brief
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/// @copyright (c) 2014-2023 This file is distributed under the MIT License.
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/// See LICENSE.md for details.
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/unistd.h>
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#include <sys/wait.h>
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int main(int argc, char *argv[])
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{
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if (argc != 2) {
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return EXIT_FAILURE;
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}
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char *ptr;
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int N;
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N = strtol(argv[1], &ptr, 10);
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pid_t cpid, mypid;
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#if 0
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char buffer[256];
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N = strtol(argv[1], &ptr, 10);
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char *_argv[] = {
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"/bin/tests/t_fork",
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itoa(buffer, N - 1, 10),
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NULL
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};
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printf("N = %d\n", N);
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if (N > 1) {
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printf("Keep caling (N = %d)\n", N);
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if ((cpid = fork()) == 0) {
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printf("I'm the child (pid = %d, N = %d)!\n", getpid(), N);
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execv(_argv[0], _argv);
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}
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printf("Will wait for %d\n", N, cpid);
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while (wait(NULL) != -1) continue;
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}
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#else
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while (1) {
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mypid = getpid();
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if (N > 0) {
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if ((cpid = fork()) == 0) {
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N -= 1;
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continue;
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}
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printf("I'm %d and I will wait for %d (N = %d)!\n", mypid, cpid, N);
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while (wait(NULL) != -1) continue;
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printf("I'm %d and I waited for %d (N = %d)!\n", mypid, cpid, N);
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} else {
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printf("I'm %d and I will not wait!\n", mypid);
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}
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break;
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}
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#endif
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return EXIT_SUCCESS;
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}
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