the big time handling overhaul

[musl] / src / time / __map_file.c

diff --git a/src/time/__map_file.c b/src/time/__map_file.c
new file mode 100644 (file)
index 0000000..b6bf272
--- /dev/null
+++ b/src/time/__map_file.c
@@ -0,0 +1,20 @@
+#include <sys/mman.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+#include "syscall.h"
+
+void *__mmap(void *, size_t, int, int, int, off_t);
+
+const char unsigned *__map_file(const char *pathname, size_t *size)
+{
+       struct stat st;
+       const unsigned char *map = MAP_FAILED;
+       int flags = O_RDONLY|O_LARGEFILE|O_CLOEXEC|O_NOFOLLOW|O_NONBLOCK;
+       int fd = __syscall(SYS_open, pathname, flags);
+       if (fd < 0) return 0;
+       if (!__syscall(SYS_fstat, fd, &st))
+               map = __mmap(0, st.st_size, PROT_READ, MAP_SHARED, fd, 0);
+       __syscall(SYS_close);
+       *size = st.st_size;
+       return map == MAP_FAILED ? 0 : map;
+}