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74 lines
1.6 KiB
C
74 lines
1.6 KiB
C
/*
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* This tests whether or not a dup2() of STDOUT_FILENO in a child
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* process makes STDOUT_FILENO unusable in the parent process. It should
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* not.
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*
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* Indirectly, it also tests screate(2), ssignal(2), and swait(2).
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*
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* Devin Reade, 1997
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*
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* $Id: dup2.c,v 1.1 1997/09/21 18:11:42 gdr Exp $
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*/
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#pragma optimize 72
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#pragma debug 0
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#include <sys/types.h>
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#include <gno/gno.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#define TEST_MSG "this is the test message\r"
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#define PARENT_MSG_1 "doing fork\r"
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#define PARENT_MSG_2 "parent waking up\r"
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#define CHILD_MSG_1 "child sleeping\r"
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#define CHILD_MSG_2 "child doing sema up\r"
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#define CHILD_FAIL_1 "dup2() failed in child\r"
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#if 1
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#define LENGTH(str) (sizeof(str) -1)
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#else
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#include <string.h>
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#define LENGTH(str) strlen(str)
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#endif
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int sema;
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static void
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_child (void) {
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write(STDOUT_FILENO, CHILD_MSG_1, LENGTH(CHILD_MSG_1));
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sleep(1);
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if (dup2(STDERR_FILENO, STDOUT_FILENO) == -1) {
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write(STDOUT_FILENO, CHILD_FAIL_1, LENGTH(CHILD_FAIL_1));
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} else {
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write(STDOUT_FILENO, CHILD_MSG_2, LENGTH(CHILD_MSG_2));
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}
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ssignal(sema);
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_exit(0);
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}
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int
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main (int argc, char **argv) {
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if ((sema = screate(0)) == -1) {
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perror("couldn't create semaphore");
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exit(1);
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}
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write(STDOUT_FILENO, PARENT_MSG_1, LENGTH(PARENT_MSG_1));
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sleep(1);
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switch(fork(_child)) {
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case -1:
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perror("fork failed");
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exit(1);
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default:
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swait(sema);
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write(STDOUT_FILENO, PARENT_MSG_2, LENGTH(PARENT_MSG_2));
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write(STDOUT_FILENO, TEST_MSG, LENGTH(TEST_MSG));
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}
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return 0;
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}
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