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2017-09-01 Paul Pluzhnikov <ppluzhnikov@google.com>

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* stdlib/tst-atexit-common.c (do_test): Test support for at least
	32 atexit handlers.
This commit is contained in:
Paul Pluzhnikov 2017-09-01 09:31:13 -07:00
parent a617bd119f
commit 50c66c7acd
2 changed files with 29 additions and 17 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
2017-09-01 Paul Pluzhnikov <ppluzhnikov@google.com>
* stdlib/tst-atexit-common.c (do_test): Test support for at least
32 atexit handlers.
2017-09-01 Zack Weinberg <zackw@panix.com>
* math/math.h (HUGE_VAL): Improve commentary.

41
stdlib/tst-atexit-common.c
View File

@ -23,7 +23,13 @@
#include <unistd.h>
#include <sys/wait.h>
#define MAX_ATEXIT 20 /* Large enough for current set of invocations. */
/* http://pubs.opengroup.org/onlinepubs/000095399/functions/atexit.html
requires that we support at least 32 atexit handlers.
The number we actually support is limited by memory. Here we simply
check that we support at least the minimum required. */
#define MAX_ATEXIT 32
static char crumbs[MAX_ATEXIT];
static int next_slot = 0;
@ -66,7 +72,7 @@ static void
fn_final (void)
{
/* Arbitrary sequence matching current registrations. */
const char expected[] = "3021121130211";
const char expected[] = "00000000000000000000000003021121130211";
if (strcmp (crumbs, expected) == 0)
_exit_with_flush (0);
@ -76,25 +82,26 @@ fn_final (void)
_exit_with_flush (1);
}
/* This is currently just a basic test to verify that exit handlers execute
in LIFO order, even when the handlers register additional new handlers.
TODO: Additional tests that we should do:
1. POSIX says we need to support at least ATEXIT_MAX
2. ... */
static int
do_test (void)
{
/* Register this first so it can verify expected order of the rest. */
ATEXIT (fn_final);
int slots_remaining = MAX_ATEXIT;
ATEXIT (fn1);
ATEXIT (fn3);
ATEXIT (fn1);
ATEXIT (fn2);
ATEXIT (fn1);
ATEXIT (fn3);
/* Register this first so it can verify expected order of the rest. */
ATEXIT (fn_final); --slots_remaining;
ATEXIT (fn1); --slots_remaining;
ATEXIT (fn3); --slots_remaining;
ATEXIT (fn1); --slots_remaining;
ATEXIT (fn2); --slots_remaining;
ATEXIT (fn1); --slots_remaining;
ATEXIT (fn3); --slots_remaining;
/* Fill the rest of available slots with fn0. */
while (slots_remaining > 0)
{
ATEXIT (fn0); --slots_remaining;
}
/* Verify that handlers registered above are inherited across fork. */
const pid_t child = fork ();