librb: add rb_{set,clear}_cloexec

librb/include/rb_commio.h

@@ -118,6 +118,8 @@ void rb_note(rb_fde_t *, const char *);
 #define RB_SSL_CERTFP_LEN_SHA512	64
 
 int rb_set_nb(rb_fde_t *);
+int rb_set_cloexec(rb_fde_t *);
+int rb_clear_cloexec(rb_fde_t *);
 int rb_set_buffers(rb_fde_t *, int);
 
 int rb_get_sockerr(rb_fde_t *);

librb/src/commio.c

@@ -260,6 +260,50 @@ rb_set_nb(rb_fde_t *F)
 	return 1;
 }
 
+int
+rb_set_cloexec(rb_fde_t *F)
+{
+#ifdef _WIN32
+	SetHandleInformation((HANDLE) F->fd, HANDLE_FLAG_INHERIT, 0);
+#else
+	int res;
+	rb_platform_fd_t fd;
+	if(F == NULL)
+		return 0;
+	fd = F->fd;
+
+	res = fcntl(fd, F_GETFD, NULL);
+	if(res == -1)
+		return 0;
+	if(fcntl(fd, F_SETFD, res | FD_CLOEXEC) == -1)
+		return 0;
+
+	return 1;
+#endif
+}
+
+int
+rb_clear_cloexec(rb_fde_t *F)
+{
+#ifdef _WIN32
+	SetHandleInformation((HANDLE) F->fd, HANDLE_FLAG_INHERIT, 1);
+#else
+	int res;
+	rb_platform_fd_t fd;
+	if(F == NULL)
+		return 0;
+	fd = F->fd;
+
+	res = fcntl(fd, F_GETFD, NULL);
+	if(res == -1)
+		return 0;
+	if(fcntl(fd, F_SETFD, res & ~FD_CLOEXEC) == -1)
+		return 0;
+
+	return 1;
+#endif
+}
+
 /*
  * rb_settimeout() - set the socket timeout
  *

librb/src/export-syms.txt

@@ -13,6 +13,7 @@ rb_bh_usage
 rb_bh_usage_all
 rb_bind
 rb_checktimeouts
+rb_clear_cloexec
 rb_clear_patricia
 rb_close
 rb_connect_sockaddr
@@ -153,6 +154,7 @@ rb_sctp_bindx
 rb_select
 rb_send_fd_buf
 rb_set_buffers
+rb_set_cloexec
 rb_set_nb
 rb_set_time
 rb_set_type