qbit/go
1
0
Fork 0
mirror of https://github.com/golang/go synced 2024-11-07 15:46:23 -07:00
Code Releases Activity

runtime: ignore GNU/Linux sigaction errors for signals 32 and 33

Browse Source 
This avoids problems when running under QEMU. It seems that at least
some QEMU versions turn the sigaction implementation into a call to
the C library sigaction function. The C library function will reject
attempts to set the signal handler for signals 32 and 33. Ignore
errors in that case.

Change-Id: Id443a9a32f6fb0ceef5c59a398e7ede30bf71646
Reviewed-on: https://go-review.googlesource.com/125955
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Heschi Kreinick <heschi@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Ian Lance Taylor 2018-07-25 14:09:02 -07:00
parent 5f5402b723
commit c0e5485bd5
1 changed files with 12 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
src/runtime/os_linux.go
View File

@ -415,9 +415,18 @@ func (c *sigctxt) fixsigcode(sig uint32) {
//go:nosplit
func sysSigaction(sig uint32, new, old *sigactiont) {
if rt_sigaction(uintptr(sig), new, old, unsafe.Sizeof(sigactiont{}.sa_mask)) != 0 {
// Workaround for bug in Qemu user mode emulation. (qemu
// rejects rt_sigaction of signal 64, SIGRTMAX).
if sig != 64 {
// Workaround for bugs in QEMU user mode emulation.
//
// QEMU turns calls to the sigaction system call into
// calls to the C library sigaction call; the C
// library call rejects attempts to call sigaction for
// SIGCANCEL (32) or SIGSETXID (33).
//
// QEMU rejects calling sigaction on SIGRTMAX (64).
//
// Just ignore the error in these case. There isn't
// anything we can do about it anyhow.
if sig != 32 && sig != 33 && sig != 64 {
// Use system stack to avoid split stack overflow on ppc64/ppc64le.
systemstack(func() {
throw("sigaction failed")