Public bug reported:
The simple program:
#include <signal.h>
int
main (int arcg, char *argv[])
{
pthread_kill((pthread_t)0,0);
return 0;
}
Gets "Segmentation fault". The man page says it should return ESRCH. Looking at
the eglibc-2.19 source I found:
In ./nptl/sysdeps/unix/sysv/linux/pthread_sigqueue.c
27
29 int
30 pthread_sigqueue (threadid, signo, value)
31 pthread_t threadid;
32 int signo;
33 const union sigval value;
34 {
35 #ifdef __NR_rt_tgsigqueueinfo
36 struct pthread *pd = (struct pthread *) threadid;
37
38 /* Make sure the descriptor is valid. */
39 if (DEBUGGING_P && INVALID_TD_P (pd))
40 /* Not a valid thread handle. */
41 return ESRCH;
42
and in ./nptl/sysdeps/unix/sysv/linux/pthread_kill.c
27 int
28 __pthread_kill (threadid, signo)
29 pthread_t threadid;
30 int signo;
31 {
32 struct pthread *pd = (struct pthread *) threadid;
33
34 /* Make sure the descriptor is valid. */
35 if (DEBUGGING_P && INVALID_TD_P (pd))
36 /* Not a valid thread handle. */
37 return ESRCH;
38
and in ./ports/sysdeps/unix/bsd/bsd4.4/kfreebsd/fbtl/pthread_kill.c
27 int
28 __pthread_kill (threadid, signo)
29 pthread_t threadid;
30 int signo;
31 {
32 struct pthread *pd = (struct pthread *) threadid;
33
34 /* Make sure the descriptor is valid. */
35 if (DEBUGGING_P && INVALID_TD_P (pd))
36 /* Not a valid thread handle. */
37 return ESRCH;
38
In all of these cases, the "DEBUGGING_P &&" causes the "INVALID_TD_P
(pd)" test to not be generated, since DEBUGGING_P is #defined as 0. We
need to do the test!
The Ubuntu man page for pthread_kill says:
If sig is 0, then no signal is sent, but error checking is still
performed; this can be used to check for the existence of a thread ID.
$ lsb_release -rd
Description: Ubuntu 14.04.3 LTS
Release: 14.04
$ apt-cache policy libc6
libc6:
Installed: 2.19-0ubuntu6.6
Candidate: 2.19-0ubuntu6.6
Version table:
*** 2.19-0ubuntu6.6 0
500 http://ca.archive.ubuntu.com/ubuntu/ trusty-updates/main amd64
Packages
500 http://security.ubuntu.com/ubuntu/ trusty-security/main amd64
Packages
100 /var/lib/dpkg/status
2.19-0ubuntu6 0
500 http://ca.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages
** Affects: glibc (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1485168
Title:
pthread_kill(0,0) Segmentation fault rather than ESRCH
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