use restrict everywhere it's required by c99 and/or posix 2008
to deal with the fact that the public headers may be used with pre-c99
compilers, __restrict is used in place of restrict, and defined
appropriately for any supported compiler. we also avoid the form
[restrict] since older versions of gcc rejected it due to a bug in the
original c99 standard, and instead use the form *restrict.
diff --git a/src/process/posix_spawnattr_getsigdefault.c b/src/process/posix_spawnattr_getsigdefault.c
index 5f0dfb5..a49050a 100644
--- a/src/process/posix_spawnattr_getsigdefault.c
+++ b/src/process/posix_spawnattr_getsigdefault.c
@@ -1,6 +1,6 @@
#include <spawn.h>
-int posix_spawnattr_getsigdefault(const posix_spawnattr_t *attr, sigset_t *def)
+int posix_spawnattr_getsigdefault(const posix_spawnattr_t *restrict attr, sigset_t *restrict def)
{
*def = attr->__def;
return 0;