commit d9d178bc13c63767a7adc6acda4c158bea3a24d5
author Lorenz Bauer <i@lmb.io> Tue Sep 27 09:39:37 2022 +0000
committer Gopher Robot <gobot@golang.org> Tue Sep 27 17:03:52 2022 +0000
tree 7941e6da7fec95e9e5b05cd3cec58de66f612d29
parent 8cfa568d3c25ac0ef41047a62ff55955949726ed

unix: add PthreadSigmask for Linux

Add a syscall wrapper for SYS_RT_SIGPROCMASK and export it as
PthreadSigmask. The latter is defined by POSIX and can therefore
be implemented by Darwin, etc. later on.

Follow the approach used by Signalfd of passing _C__NSIG/8 as
sigsetsize. This avoids exporting _C__NSIG and allows the syscall
to work with the current definition of Sigset_t, which doesn't
match the kernel definition of Sigset_t.

Updates golang/go#55349

Change-Id: I49dc93366a7d316d820b0c25ecdef2ebb584634b
Reviewed-on: https://go-review.googlesource.com/c/sys/+/435095
Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Auto-Submit: Tobias Klauser <tobias.klauser@gmail.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
Run-TryBot: Ian Lance Taylor <iant@google.com>

unix/syscall_linux.go

diff --git a/unix/syscall_linux.go b/unix/syscall_linux.go
index 4714691..583ff00 100644
--- a/unix/syscall_linux.go
+++ b/unix/syscall_linux.go
@@ -2368,6 +2368,16 @@
 	return prev, nil
 }
 
+//sysnb	rtSigprocmask(how int, set *Sigset_t, oldset *Sigset_t, sigsetsize uintptr) (err error) = SYS_RT_SIGPROCMASK
+
+func PthreadSigmask(how int, set, oldset *Sigset_t) error {
+	if oldset != nil {
+		// Explicitly clear in case Sigset_t is larger than _C__NSIG.
+		*oldset = Sigset_t{}
+	}
+	return rtSigprocmask(how, set, oldset, _C__NSIG/8)
+}
+
 /*
  * Unimplemented
  */
@@ -2426,7 +2436,6 @@
 // RestartSyscall
 // RtSigaction
 // RtSigpending
-// RtSigprocmask
 // RtSigqueueinfo
 // RtSigreturn
 // RtSigsuspend

unix/zsyscall_linux.go

diff --git a/unix/zsyscall_linux.go b/unix/zsyscall_linux.go
index bc4a275..293cf36 100644
--- a/unix/zsyscall_linux.go
+++ b/unix/zsyscall_linux.go
@@ -2151,3 +2151,13 @@
 	}
 	return
 }
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func rtSigprocmask(how int, set *Sigset_t, oldset *Sigset_t, sigsetsize uintptr) (err error) {
+	_, _, e1 := RawSyscall6(SYS_RT_SIGPROCMASK, uintptr(how), uintptr(unsafe.Pointer(set)), uintptr(unsafe.Pointer(oldset)), uintptr(sigsetsize), 0, 0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}