Check if a file path and descriptor are indeed the same file. This function
is needed for TACTOU avoidance.
Signed-off-by: Sami Kerola <kerolasa@xxxxxx>
---
include/fileutils.h | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/include/fileutils.h b/include/fileutils.h
index be6d1f7..55df1a7 100644
--- a/include/fileutils.h
+++ b/include/fileutils.h
@@ -4,6 +4,7 @@
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
+#include <sys/stat.h>
#include "c.h"
@@ -25,6 +26,19 @@ static inline FILE *xfmkstemp(char **tmpname, const char *dir, const char *prefi
return ret;
}
+static inline int is_same_inode(const int fd, const char *path)
+{
+ struct stat f, p;
+
+ if (fstat(fd, &f) < 0)
+ return 0;
+ if (stat(path, &p) < 0)
+ return 0;
+ if (f.st_dev != p.st_dev || f.st_ino != p.st_ino)
+ return 0;
+ return 1;
+}
+
extern int dup_fd_cloexec(int oldfd, int lowfd);
extern int get_fd_tabsize(void);
--
2.6.2
--
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