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tests: Avoid generating cores in softsig-helper

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Our opr/softsig-t tests run softsig-helper to generate SIGSEGV and
SIGBUS signals (among other things), which may generate core files (if
'ulimit -c' is nonzero). The core files are useless, since we expect
those signals to be generated.

Usually the core files are generated in the build tree (where we run the
tests from), which is a minor annoyance. But some systems may be
configured to store core files in a central location (e.g.
/var/lib/systemd/coredump), which starts to build up over time after
many builds.

To avoid this, prevent core files from being generated in softsig-helper
for the SIGSEGV and SIGBUS cases by calling setrlimit().

Change-Id: Ice71e79009cf2b44d4cbe32233d3a7ee12e08d2d
Reviewed-on: https://gerrit.openafs.org/15795
Reviewed-by: Mark Vitale <mvitale@sinenomine.net>
Tested-by: Mark Vitale <mvitale@sinenomine.net>
Reviewed-by: Michael Meffie <mmeffie@sinenomine.net>
This commit is contained in:
Andrew Deason 2024-08-06 20:57:29 -05:00 committed by Michael Meffie
parent c78e2b4c64
commit 1acc612687
1 changed files with 23 additions and 0 deletions
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23
tests/opr/softsig-helper.c
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@ -32,6 +32,9 @@
#include <roken.h>
#include <pthread.h>
#include <sys/mman.h>
#ifdef HAVE_SYS_RESOURCE_H
# include <sys/resource.h>
#endif
#include <afs/opr.h>
#include <opr/softsig.h>
@ -79,8 +82,27 @@ mythread(void *arg) {
return NULL;
}
static void
disable_core(void)
{
#ifdef HAVE_GETRLIMIT
struct rlimit rlp;
memset(&rlp, 0, sizeof(rlp));
/*
* Set our core limit to 0 for SIGSEGV/SIGBUS, so we don't litter core
* files around when running the test.
*/
if (setrlimit(RLIMIT_CORE, &rlp) < 0) {
perror("setrlimit(RLIMIT_CORE)");
}
#endif
}
static void *
crashingThread(void *arg) {
disable_core();
*(char *)1 = 'a'; /* raises SIGSEGV */
return NULL; /* Ha! */
}
@ -90,6 +112,7 @@ thrownUnderTheBusThread(void *arg) {
char *path = arg;
int fd = open(path, O_CREAT | O_APPEND, 0660);
char *m = mmap(NULL, 10, PROT_WRITE, MAP_PRIVATE, fd, 0);
disable_core();
*(m + 11) = 'a'; /* raises SIGBUS */
return NULL;
}