os: document that Exit does not run deferred calls

Fixes #4101.

R=dsymonds, rsc
CC=golang-dev
https://golang.org/cl/7065048

diff --git a/src/pkg/os/proc.go b/src/pkg/os/proc.go
index 61545f4456a316aa8abec19d2571d299409a2a01..38c436ec54d2450e6125be36d4ae243d602d1153 100644 (file)
--- a/src/pkg/os/proc.go
+++ b/src/pkg/os/proc.go
@@ -31,4 +31,6 @@ func Getgroups() ([]int, error) {
 
 // Exit causes the current program to exit with the given status code.
 // Conventionally, code zero indicates success, non-zero an error.
+// The program terminates immediately; deferred functions are
+// not run.
 func Exit(code int) { syscall.Exit(code) }