nptl: Implement raise in terms of pthread_kill

Now that pthread_kill is provided by libc.so it is possible to
implement the generic POSIX implementation as
'pthread_kill(pthread_self(), sig)'.

For Linux implementation, pthread_kill read the targeting TID from
the TCB.  For raise, this it not possible because it would make raise
fail when issue after vfork (where creates the resulting process
has a different TID from the parent, but its TCB is not updated as
for pthread_create).  To make raise use pthread_kill, it is make
usable from vfork by getting the target thread id through gettid
syscall.

Checked on x86_64-linux-gnu and aarch64-linux-gnu.

3 files changed, 9 insertions, 56 deletions

diff --git a/sysdeps/htl/pthreadP.h b/sysdeps/htl/pthreadP.h
index 8e2cf2ce65..3b357b7bdc 100644
--- a/sysdeps/htl/pthreadP.h
+++ b/sysdeps/htl/pthreadP.h
@@ -31,8 +31,6 @@ extern void __pthread_init_static_tls (struct link_map *) attribute_hidden;
 
 /* These represent the interface used by glibc itself.  */
 
-extern pthread_t __pthread_self (void);
-extern int __pthread_kill (pthread_t threadid, int signo);
 extern struct __pthread **__pthread_threads;
 
 extern int __pthread_mutex_init (pthread_mutex_t *__mutex, const pthread_mutexattr_t *__attr);
diff --git a/sysdeps/posix/raise.c b/sysdeps/posix/raise.c
index 9fdb4d538b..4806c0cc63 100644
--- a/sysdeps/posix/raise.c
+++ b/sysdeps/posix/raise.c
@@ -16,13 +16,20 @@
    <https://www.gnu.org/licenses/>.  */
 
 #include <signal.h>
-#include <unistd.h>
+#include <errno.h>
+#include <pthread.h>
 
 /* Raise the signal SIG.  */
 int
 raise (int sig)
 {
-  return __kill (__getpid (), sig);
+  int ret = __pthread_kill (__pthread_self (), sig);
+  if (ret != 0)
+    {
+      __set_errno (ret);
+      ret = -1;
+    }
+  return ret;
 }
 libc_hidden_def (raise)
 weak_alias (raise, gsignal)
diff --git a/sysdeps/unix/sysv/linux/raise.c b/sysdeps/unix/sysv/linux/raise.c
deleted file mode 100644
index 9be3b37f53..0000000000
--- a/sysdeps/unix/sysv/linux/raise.c
+++ /dev/null
@@ -1,52 +0,0 @@
-/* Copyright (C) 2002-2021 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-   Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
-
-   The GNU C Library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Lesser General Public
-   License as published by the Free Software Foundation; either
-   version 2.1 of the License, or (at your option) any later version.
-
-   The GNU C Library is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library; if not, see
-   <https://www.gnu.org/licenses/>.  */
-
-#include <signal.h>
-#include <sysdep.h>
-#include <errno.h>
-#include <sys/types.h>
-#include <unistd.h>
-#include <internal-signals.h>
-
-int
-raise (int sig)
-{
-  /* rt_sigprocmask may fail if:
-
-     1. sigsetsize != sizeof (sigset_t) (EINVAL)
-     2. a failure in copy from/to user space (EFAULT)
-     3. an invalid 'how' operation (EINVAL)
-
-     The first case is already handle in glibc syscall call by using the arch
-     defined _NSIG.  Second case is handled by using a stack allocated mask.
-     The last one should be handled by the block/unblock functions.  */
-
-  sigset_t set;
-  __libc_signal_block_app (&set);
-
-  pid_t pid = INTERNAL_SYSCALL_CALL (getpid);
-  pid_t tid = INTERNAL_SYSCALL_CALL (gettid);
-
-  int ret = INLINE_SYSCALL_CALL (tgkill, pid, tid, sig);
-
-  __libc_signal_restore_set (&set);
-
-  return ret;
-}
-libc_hidden_def (raise)
-weak_alias (raise, gsignal)