source: web/old/remctl-2.14/tests/data/cmd-closed.c @ f6f3e91

web
Last change on this file since f6f3e91 was f6f3e91, checked in by Jessica B. Hamrick <jhamrick@…>, 15 years ago

Preserve directory hierarchy (not sure what happened to it)

  • Property mode set to 100644
File size: 1.1 KB
Line 
1/*
2 * Small C program to verify that standard input is not closed but returns EOF
3 * on any read and that all file descriptors higher than 2 are closed.
4 *
5 * Written by Russ Allbery <rra@stanford.edu>
6 * Copyright 2007, 2008 Board of Trustees, Leland Stanford Jr. University
7 *
8 * See LICENSE for licensing terms.
9 */
10
11#include <config.h>
12#include <portable/system.h>
13
14#include <errno.h>
15
16int
17main(void)
18{
19    char buffer;
20    ssize_t count;
21    int i;
22
23    /* First check that standard input is not closed but returns EOF. */
24    count = read(0, &buffer, 1);
25    if (count > 0) {
26        printf("Read %d bytes\n", (int) count);
27        exit(1);
28    } else if (count < 0) {
29        printf("Failed with error: %s\n", strerror(errno));
30        exit(2);
31    }
32
33    /*
34     * Now, check that all higher file descriptors are closed.  (We only go up
35     * to 31; it's very unlikely that there will be problems higher than
36     * that.)
37     */
38    for (i = 3; i < 32; i++)
39        if (close(i) >= 0 || errno != EBADF) {
40            printf("File descriptor %d was open\n", i);
41            exit(3);
42        }
43    printf("Okay");
44    exit(0);
45}
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