m + add ascii.h and exec.h

Signed-off-by: Mattias Andrée <maandree@kth.se>

1 files changed, 56 insertions, 0 deletions

diff --git a/execveat.c b/execveat.c
new file mode 100644
index 0000000..ed7b11e
--- /dev/null
+++ b/execveat.c
@@ -0,0 +1,56 @@
+/* See LICENSE file for copyright and license details. */
+#include "common.h"
+#ifndef TEST
+
+
+int
+libsimple_execveat(int dirfd, const char *pathname, char *const argv[], char *const envp[], int flags)
+{
+	struct stat st;
+	int fd, saved_errno;
+
+#if defined(__linux__)
+	execveat(dirfd, pathname, argv, envp, flags);
+	if (errno != ENOSYS)
+		return -1;
+#endif
+
+	if (flags & AT_EMPTY_PATH)
+		return fexecve(dirfd, argv, envp);
+
+#ifndef O_PATH
+# define O_PATH O_RDONLY
+#endif
+
+	fd = openat(dirfd, pathname, O_PATH | ((flags & AT_SYMLINK_NOFOLLOW) ? O_NOFOLLOW : 0));
+	if (fd < 0)
+		return -1;
+
+	if (flags & AT_SYMLINK_NOFOLLOW) {
+		if (fstat(fd, &st)) {
+			saved_errno = errno;
+			close(fd);
+			errno = saved_errno;
+			return -1;
+		}
+		if (S_ISLNK(st.st_mode)) {
+			close(fd);
+			errno = ELOOP;
+			return -1;
+		}
+	}
+
+	return fexecve(fd, argv, envp);
+}
+
+
+#else
+#include "test.h"
+
+int
+main(void)
+{
+        return 0;
+}
+
+#endif