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-rw-r--r--compat/mmap.c42
1 files changed, 42 insertions, 0 deletions
diff --git a/compat/mmap.c b/compat/mmap.c
new file mode 100644
index 0000000000..c9d46d1742
--- /dev/null
+++ b/compat/mmap.c
@@ -0,0 +1,42 @@
+#include "../git-compat-util.h"
+
+void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset)
+{
+ size_t n = 0;
+
+ if (start != NULL || !(flags & MAP_PRIVATE))
+ die("Invalid usage of mmap when built with NO_MMAP");
+
+ start = xmalloc(length);
+ if (start == NULL) {
+ errno = ENOMEM;
+ return MAP_FAILED;
+ }
+
+ while (n < length) {
+ ssize_t count = pread(fd, (char *)start + n, length - n, offset + n);
+
+ if (count == 0) {
+ memset((char *)start+n, 0, length-n);
+ break;
+ }
+
+ if (count < 0) {
+ if (errno == EAGAIN || errno == EINTR)
+ continue;
+ free(start);
+ errno = EACCES;
+ return MAP_FAILED;
+ }
+
+ n += count;
+ }
+
+ return start;
+}
+
+int git_munmap(void *start, size_t length)
+{
+ free(start);
+ return 0;
+}