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/* Test of <errno.h> substitute.
Copyright (C) 2008-2025 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
/* Written by Bruno Haible <bruno@clisp.org>, 2008. */
#include <config.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/* Check all POSIX-defined errno values, using M (v) to check value v. */
#define CHECK_POSIX_ERRNOS(m) \
m (E2BIG) \
m (EACCES) \
m (EADDRINUSE) \
m (EADDRNOTAVAIL) \
m (EAFNOSUPPORT) \
m (EAGAIN) \
m (EALREADY) \
m (EBADF) \
m (EBADMSG) \
m (EBUSY) \
m (ECANCELED) \
m (ECHILD) \
m (ECONNABORTED) \
m (ECONNREFUSED) \
m (ECONNRESET) \
m (EDEADLK) \
m (EDESTADDRREQ) \
m (EDOM) \
m (EDQUOT) \
m (EEXIST) \
m (EFAULT) \
m (EFBIG) \
m (EHOSTUNREACH) \
m (EIDRM) \
m (EILSEQ) \
m (EINPROGRESS) \
m (EINTR) \
m (EINVAL) \
m (EIO) \
m (EISCONN) \
m (EISDIR) \
m (ELOOP) \
m (EMFILE) \
m (EMLINK) \
m (EMSGSIZE) \
m (EMULTIHOP) \
m (ENAMETOOLONG) \
m (ENETDOWN) \
m (ENETRESET) \
m (ENETUNREACH) \
m (ENFILE) \
m (ENOBUFS) \
m (ENODEV) \
m (ENOENT) \
m (ENOEXEC) \
m (ENOLCK) \
m (ENOLINK) \
m (ENOMEM) \
m (ENOMSG) \
m (ENOPROTOOPT) \
m (ENOSPC) \
m (ENOSYS) \
m (ENOTCONN) \
m (ENOTDIR) \
m (ENOTEMPTY) \
m (ENOTRECOVERABLE) \
m (ENOTSOCK) \
m (ENOTSUP) \
m (ENOTTY) \
m (ENXIO) \
m (EOPNOTSUPP) \
m (EOVERFLOW) \
m (EOWNERDEAD) \
m (EPERM) \
m (EPIPE) \
m (EPROTO) \
m (EPROTONOSUPPORT) \
m (EPROTOTYPE) \
m (ERANGE) \
m (EROFS) \
m (ESOCKTNOSUPPORT) \
m (ESPIPE) \
m (ESRCH) \
m (ESTALE) \
m (ETIMEDOUT) \
m (ETXTBSY) \
m (EWOULDBLOCK) \
m (EXDEV) \
/* end of CHECK_POSIX_ERRNOS */
/* Verify that the POSIX mandated errno values can be used as integer
constant expressions and are all positive (except on Haiku). */
#if defined __HAIKU__
# define NONZERO_INTEGER_CONSTANT_EXPRESSION(e) static_assert (0 != (e) << 0);
CHECK_POSIX_ERRNOS (NONZERO_INTEGER_CONSTANT_EXPRESSION)
#else
# define POSITIVE_INTEGER_CONSTANT_EXPRESSION(e) static_assert (0 < (e) << 0);
CHECK_POSIX_ERRNOS (POSITIVE_INTEGER_CONSTANT_EXPRESSION)
#endif
/* Verify that errno values can all be used in #if. */
#define USABLE_IN_IF(e) ^ e
#if 0 CHECK_POSIX_ERRNOS (USABLE_IN_IF)
#endif
/* Check that errno values all differ, except possibly for
EWOULDBLOCK == EAGAIN and ENOTSUP == EOPNOTSUPP. */
#define ERRTAB(e) { #e, e },
static struct nameval { char const *name; int value; }
errtab[] = { CHECK_POSIX_ERRNOS (ERRTAB) };
static int
errtab_cmp (void const *va, void const *vb)
{
struct nameval const *a = va, *b = vb;
/* Sort by value first, then by name (to simplify later tests).
Subtraction cannot overflow as both are positive. */
int diff = a->value - b->value;
return diff ? diff : strcmp (a->name, b->name);
}
int
main ()
{
int test_exit_status = EXIT_SUCCESS;
/* Verify that errno can be assigned. */
errno = EOVERFLOW;
/* Check that errno values all differ, except possibly for
EAGAIN == EWOULDBLOCK and ENOTSUP == EOPNOTSUPP. */
int nerrtab = sizeof errtab / sizeof *errtab;
qsort (errtab, nerrtab, sizeof *errtab, errtab_cmp);
for (int i = 1; i < nerrtab; i++)
if (errtab[i - 1].value == errtab[i].value)
{
fprintf (stderr, "%s == %s == %d\n",
errtab[i - 1].name, errtab[i].name, errtab[i].value);
if (! ((strcmp ("EAGAIN", errtab[i - 1].name) == 0
&& strcmp ("EWOULDBLOCK", errtab[i].name) == 0)
|| (strcmp ("ENOTSUP", errtab[i - 1].name) == 0
&& strcmp ("EOPNOTSUPP", errtab[i].name) == 0)))
test_exit_status = EXIT_FAILURE;
}
return test_exit_status;
}
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