You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
104 lines
3.0 KiB
104 lines
3.0 KiB
From b05795bd3d8afcdcb765639a636ada8d36a2ee79 Mon Sep 17 00:00:00 2001
|
|
From: Lennart Poettering <lennart@poettering.net>
|
|
Date: Fri, 18 Jan 2019 20:04:13 +0100
|
|
Subject: [PATCH] util.h: add new UNPROTECT_ERRNO macro
|
|
|
|
THis is inspired by #11395, but much simpler.
|
|
|
|
(cherry picked from commit 840f606d88fef2f5d240b2d759ce7b951354d5bb)
|
|
|
|
Resolves: #1691691
|
|
---
|
|
src/basic/util.h | 9 +++++++++
|
|
src/test/test-fs-util.c | 6 +++---
|
|
src/test/test-util.c | 25 +++++++++++++++++++++++++
|
|
3 files changed, 37 insertions(+), 3 deletions(-)
|
|
|
|
diff --git a/src/basic/util.h b/src/basic/util.h
|
|
index 9699d228f9..27b5a09782 100644
|
|
--- a/src/basic/util.h
|
|
+++ b/src/basic/util.h
|
|
@@ -134,11 +134,20 @@ static inline void *mempset(void *s, int c, size_t n) {
|
|
}
|
|
|
|
static inline void _reset_errno_(int *saved_errno) {
|
|
+ if (*saved_errno < 0) /* Invalidated by UNPROTECT_ERRNO? */
|
|
+ return;
|
|
+
|
|
errno = *saved_errno;
|
|
}
|
|
|
|
#define PROTECT_ERRNO _cleanup_(_reset_errno_) __attribute__((unused)) int _saved_errno_ = errno
|
|
|
|
+#define UNPROTECT_ERRNO \
|
|
+ do { \
|
|
+ errno = _saved_errno_; \
|
|
+ _saved_errno_ = -1; \
|
|
+ } while (false)
|
|
+
|
|
static inline int negative_errno(void) {
|
|
/* This helper should be used to shut up gcc if you know 'errno' is
|
|
* negative. Instead of "return -errno;", use "return negative_errno();"
|
|
diff --git a/src/test/test-fs-util.c b/src/test/test-fs-util.c
|
|
index fc650b513e..7b7990bb70 100644
|
|
--- a/src/test/test-fs-util.c
|
|
+++ b/src/test/test-fs-util.c
|
|
@@ -322,11 +322,11 @@ static void test_unlink_noerrno(void) {
|
|
|
|
{
|
|
PROTECT_ERRNO;
|
|
- errno = -42;
|
|
+ errno = 42;
|
|
assert_se(unlink_noerrno(name) >= 0);
|
|
- assert_se(errno == -42);
|
|
+ assert_se(errno == 42);
|
|
assert_se(unlink_noerrno(name) < 0);
|
|
- assert_se(errno == -42);
|
|
+ assert_se(errno == 42);
|
|
}
|
|
}
|
|
|
|
diff --git a/src/test/test-util.c b/src/test/test-util.c
|
|
index 4d3e5c5b94..df60d89115 100644
|
|
--- a/src/test/test-util.c
|
|
+++ b/src/test/test-util.c
|
|
@@ -164,6 +164,30 @@ static void test_protect_errno(void) {
|
|
assert_se(errno == 12);
|
|
}
|
|
|
|
+static void test_unprotect_errno_inner_function(void) {
|
|
+ PROTECT_ERRNO;
|
|
+
|
|
+ errno = 2222;
|
|
+}
|
|
+
|
|
+static void test_unprotect_errno(void) {
|
|
+ log_info("/* %s */", __func__);
|
|
+
|
|
+ errno = 4711;
|
|
+
|
|
+ PROTECT_ERRNO;
|
|
+
|
|
+ errno = 815;
|
|
+
|
|
+ UNPROTECT_ERRNO;
|
|
+
|
|
+ assert_se(errno == 4711);
|
|
+
|
|
+ test_unprotect_errno_inner_function();
|
|
+
|
|
+ assert_se(errno == 4711);
|
|
+}
|
|
+
|
|
static void test_in_set(void) {
|
|
assert_se(IN_SET(1, 1));
|
|
assert_se(IN_SET(1, 1, 2, 3, 4));
|
|
@@ -307,6 +331,7 @@ int main(int argc, char *argv[]) {
|
|
test_div_round_up();
|
|
test_u64log2();
|
|
test_protect_errno();
|
|
+ test_unprotect_errno();
|
|
test_in_set();
|
|
test_log2i();
|
|
test_raw_clone();
|