X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=src%2Fbasic%2Futil.h;h=af5a4fc9e607fd86d4650661abaae33cb79b56bb;hb=955baa81f8239cb338f53c7707d6d2c656c32c33;hp=179505de8588482b14e13a866d46956e4eecb907;hpb=07045a1a92c839fd2af80bd0c060a595021bc3b3;p=elogind.git

diff --git a/src/basic/util.h b/src/basic/util.h
index 179505de8..af5a4fc9e 100644
--- a/src/basic/util.h
+++ b/src/basic/util.h
@@ -36,6 +36,7 @@
 #include <sys/socket.h>
 #include <sys/stat.h>
 #include <sys/statfs.h>
+#include <sys/sysmacros.h>
 #include <sys/types.h>
 #include <time.h>
 #include <unistd.h>
@@ -110,6 +111,16 @@ static inline void qsort_safe(void *base, size_t nmemb, size_t size, comparison_
         qsort(base, nmemb, size, compar);
 }
 
+/**
+ * Normal memcpy requires src to be nonnull. We do nothing if n is 0.
+ */
+static inline void memcpy_safe(void *dst, const void *src, size_t n) {
+        if (n == 0)
+                return;
+        assert(src);
+        memcpy(dst, src, n);
+}
+
 #if 0 /// UNNEEDED by elogind
 int on_ac_power(void);
 #endif // 0
@@ -128,7 +139,6 @@ static inline void _reset_errno_(int *saved_errno) {
 
 #define PROTECT_ERRNO _cleanup_(_reset_errno_) __attribute__((unused)) int _saved_errno_ = errno
 
-#if 0 /// UNNEEDED by elogind
 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();"
@@ -137,7 +147,6 @@ static inline int negative_errno(void) {
         assert_return(errno > 0, -EINVAL);
         return -errno;
 }
-#endif // 0
 
 static inline unsigned u64log2(uint64_t n) {
 #if __SIZEOF_LONG_LONG__ == 8
@@ -188,7 +197,7 @@ int namespace_enter(int pidns_fd, int mntns_fd, int netns_fd, int userns_fd, int
 uint64_t physical_memory(void);
 
 #if 0 /// UNNEEDED by elogind
-int update_reboot_param_file(const char *param);
 #endif // 0
+int update_reboot_parameter_and_warn(const char *param);
 
 int version(void);