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-rw-r--r--include/errno.h3
-rw-r--r--include/netdb.h3
-rw-r--r--include/pthread.h3
3 files changed, 9 insertions, 0 deletions
diff --git a/include/errno.h b/include/errno.h
index 93f5f6ec..0361b33a 100644
--- a/include/errno.h
+++ b/include/errno.h
@@ -9,6 +9,9 @@ extern "C" {
#include <bits/errno.h>
+#ifdef __GNUC__
+__attribute__((const))
+#endif
int *__errno_location(void);
#define errno (*__errno_location())
diff --git a/include/netdb.h b/include/netdb.h
index adde2c5e..d096c781 100644
--- a/include/netdb.h
+++ b/include/netdb.h
@@ -115,6 +115,9 @@ struct protoent *getprotobynumber (int);
|| (defined(_XOPEN_SOURCE) && _XOPEN_SOURCE+0 < 700)
struct hostent *gethostbyname (const char *);
struct hostent *gethostbyaddr (const void *, socklen_t, int);
+#ifdef __GNUC__
+__attribute__((const))
+#endif
int *__h_errno_location(void);
#define h_errno (*__h_errno_location())
#define HOST_NOT_FOUND 1
diff --git a/include/pthread.h b/include/pthread.h
index bba9587e..e238321b 100644
--- a/include/pthread.h
+++ b/include/pthread.h
@@ -79,6 +79,9 @@ int pthread_detach(pthread_t);
_Noreturn void pthread_exit(void *);
int pthread_join(pthread_t, void **);
+#ifdef __GNUC__
+__attribute__((const))
+#endif
pthread_t pthread_self(void);
int pthread_equal(pthread_t, pthread_t);