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-rw-r--r--src/pkg/syscall/syscall.go2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/pkg/syscall/syscall.go b/src/pkg/syscall/syscall.go
index 372149bf2..46f5c9876 100644
--- a/src/pkg/syscall/syscall.go
+++ b/src/pkg/syscall/syscall.go
@@ -9,6 +9,8 @@
// packages rather than this one if you can.
// For details of the functions and data types in this package consult
// the manuals for the appropriate operating system.
+// These calls return errno == 0 to indicate success; otherwise
+// errno is an operating system error number describing the failure.
package syscall
func Syscall(trap, a1, a2, a3 uintptr) (r1, r2, err uintptr)