[Bug 191906] New: pthread_cancel(NULL) on FreeBSD returns EINVAL, not ESRCH according to manpage

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=191906

            Bug ID: 191906
           Summary: pthread_cancel(NULL) on FreeBSD returns EINVAL, not
                    ESRCH according to manpage
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: Needs Triage
          Severity: Affects Only Me
          Priority: ---
         Component: standards
          Assignee: freebsd-standards at FreeBSD.org
          Reporter: yaneurabeya at gmail.com

According to pthread_cancel(3) and opengroup, pthread_cancel should only return
ESRCH, not EINVAL (but it apparently returns EINVAL for thread=NULL).

Found with the NetBSD libthr ATF testcases.

% cc -lpthread -Wall -o /root/test_pthread_cancel /root/test_pthread_cancel.c
% /root/test_pthread_cancel
Invalid argument
% cat /root/test_pthread_cancel.c
#include <pthread.h>
#include <stdio.h>
#include <string.h>

int
main(void)
{
        int rv = pthread_cancel(NULL);

        printf("%s\n", strerror(rv));
        return (0);
}

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