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support: Preserve errno in write_message, TEST_VERIFY and other checks

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These facilities could clobber errno, which makes it difficult to write
certain checks because a specific order has to be used.
This commit is contained in:
Florian Weimer
2018-01-12 08:18:30 +01:00
parent 63b52889c3
commit 1a51e46e4a
5 changed files with 21 additions and 0 deletions
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3
support/support_test_compare_failure.c
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@@ -16,6 +16,7 @@
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <errno.h>
#include <stdio.h>
#include <support/check.h>
@@ -44,6 +45,7 @@ support_test_compare_failure (const char *file, int line,
int right_positive,
int right_size)
{
int saved_errno = errno;
support_record_failure ();
if (left_size != right_size)
printf ("%s:%d: numeric comparison failure (widths %d and %d)\n",
@@ -52,4 +54,5 @@ support_test_compare_failure (const char *file, int line,
printf ("%s:%d: numeric comparison failure\n", file, line);
report (" left", left_expr, left_value, left_positive, left_size);
report ("right", right_expr, right_value, right_positive, right_size);
errno = saved_errno;
}