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runtime/debug: add SetCrashOutput(...CrashOptions) parameter

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This is a placeholder for future options (e.g. JSON).

The parameter is temporarily variadic to avoid breaking
x/telemetry (see CL 585378), but I plan to remove
the "..." later this week.

Updates #67182

Change-Id: I3f6f39455d852f92902f8e3f007d3093cbe555db
Reviewed-on: https://go-review.googlesource.com/c/go/+/585557
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Austin Clements <austin@google.com>
This commit is contained in:
Alan Donovan 2024-05-15 14:55:19 -04:00
parent 3d80761531
commit 3f7a030e02
3 changed files with 17 additions and 2 deletions
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3
api/next/42888.txt
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@ -1 +1,2 @@
pkg runtime/debug, func SetCrashOutput(*os.File) error #42888
pkg runtime/debug, type CrashOptions struct #67182
pkg runtime/debug, func SetCrashOutput(*os.File, ...CrashOptions) error #42888

1
doc/next/6-stdlib/99-minor/runtime/debug/67182.md Normal file
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@ -0,0 +1 @@
<!-- pacify TestCheckAPIFragments -->

15
src/runtime/debug/stack.go
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@ -31,6 +31,12 @@ func Stack() []byte {
}
}
// CrashOptions provides options that control the formatting of the
// fatal crash message.
type CrashOptions struct {
/* for future expansion */
}
// SetCrashOutput configures a single additional file where unhandled
// panics and other fatal errors are printed, in addition to standard error.
// There is only one additional file: calling SetCrashOutput again overrides
@ -40,7 +46,14 @@ func Stack() []byte {
// To disable this additional crash output, call SetCrashOutput(nil).
// If called concurrently with a crash, some in-progress output may be written
// to the old file even after an overriding SetCrashOutput returns.
func SetCrashOutput(f *os.File) error {
//
// TODO(adonovan): the variadic ... is a short-term measure to avoid
// breaking the call in x/telemetry; it will be removed before the
// go1.23 freeze.
func SetCrashOutput(f *os.File, opts ...CrashOptions) error {
if len(opts) > 1 {
panic("supply at most 1 CrashOptions")
}
fd := ^uintptr(0)
if f != nil {
// The runtime will write to this file descriptor from