license: LGPL-2.1+ -> LGPL-2.1-or-later

[thirdparty/systemd.git] / src / basic / fd-util.h

diff --git a/src/basic/fd-util.h b/src/basic/fd-util.h
index 284856ae6defa0c403d94738ca6094dd3f992cdb..2162537b80889e2776a9018b93b728565a110b8f 100644 (file)
--- a/src/basic/fd-util.h
+++ b/src/basic/fd-util.h
@@ -1,25 +1,6 @@
-/* SPDX-License-Identifier: LGPL-2.1+ */
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
 #pragma once
 
-/***
-  This file is part of systemd.
-
-  Copyright 2010 Lennart Poettering
-
-  systemd is free software; you can redistribute it and/or modify it
-  under the terms of the GNU Lesser General Public License as published by
-  the Free Software Foundation; either version 2.1 of the License, or
-  (at your option) any later version.
-
-  systemd is distributed in the hope that it will be useful, but
-  WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-  Lesser General Public License for more details.
-
-  You should have received a copy of the GNU Lesser General Public License
-  along with systemd; If not, see <http://www.gnu.org/licenses/>.
-***/
-
 #include <dirent.h>
 #include <stdbool.h>
 #include <stdio.h>
@@ -33,9 +14,16 @@
 
 int close_nointr(int fd);
 int safe_close(int fd);
-void safe_close_pair(int p[]);
+void safe_close_pair(int p[static 2]);
+
+static inline int safe_close_above_stdio(int fd) {
+        if (fd < 3) /* Don't close stdin/stdout/stderr, but still invalidate the fd by returning -1 */
+                return -1;
+
+        return safe_close(fd);
+}
 
-void close_many(const int fds[], unsigned n_fd);
+void close_many(const int fds[], size_t n_fd);
 
 int fclose_nointr(FILE *f);
 FILE* safe_fclose(FILE *f);
@@ -64,9 +52,8 @@ DEFINE_TRIVIAL_CLEANUP_FUNC(DIR*, closedir);
 
 int fd_nonblock(int fd, bool nonblock);
 int fd_cloexec(int fd, bool cloexec);
-void stdio_unset_cloexec(void);
 
-int close_all_fds(const int except[], unsigned n_except);
+int close_all_fds(const int except[], size_t n_except);
 
 int same_fd(int a, int b);
 
@@ -88,8 +75,34 @@ enum {
 
 int acquire_data_fd(const void *data, size_t size, unsigned flags);
 
-/* Hint: ENETUNREACH happens if we try to connect to "non-existing" special IP addresses, such as ::5 */
-#define ERRNO_IS_DISCONNECT(r) \
-        IN_SET(r, ENOTCONN, ECONNRESET, ECONNREFUSED, ECONNABORTED, EPIPE, ENETUNREACH)
+int fd_duplicate_data_fd(int fd);
 
 int fd_move_above_stdio(int fd);
+
+int rearrange_stdio(int original_input_fd, int original_output_fd, int original_error_fd);
+
+static inline int make_null_stdio(void) {
+        return rearrange_stdio(-1, -1, -1);
+}
+
+/* Like TAKE_PTR() but for file descriptors, resetting them to -1 */
+#define TAKE_FD(fd)                             \
+        ({                                      \
+                int _fd_ = (fd);                \
+                (fd) = -1;                      \
+                _fd_;                           \
+        })
+
+/* Like free_and_replace(), but for file descriptors */
+#define CLOSE_AND_REPLACE(a, b)                 \
+        ({                                      \
+                int *_fdp_ = &(a);              \
+                safe_close(*_fdp_);             \
+                *_fdp_ = TAKE_FD(b);            \
+                0;                              \
+        })
+
+
+int fd_reopen(int fd, int flags);
+
+int read_nr_open(void);