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// SPDX-License-Identifier: GPL-2.0
/*
* Write in a pipe and wait.
*
* Used by layout1.umount_sandboxer from fs_test.c
*
* Copyright © 2024-2025 Microsoft Corporation
*/
#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
int main(int argc, char *argv[])
{
int pipe_child, pipe_parent;
char buf;
/* The first argument must be the file descriptor number of a pipe. */
if (argc != 3) {
fprintf(stderr, "Wrong number of arguments (not two)\n");
return 1;
}
pipe_child = atoi(argv[1]);
pipe_parent = atoi(argv[2]);
/* Signals that we are waiting. */
if (write(pipe_child, ".", 1) != 1) {
perror("Failed to write to first argument");
return 1;
}
/* Waits for the parent do its test. */
if (read(pipe_parent, &buf, 1) != 1) {
perror("Failed to write to the second argument");
return 1;
}
return 0;
}
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