From: CSRG <csrg@ucbvax.Berkeley.EDU>
Date: Fri, 2 Dec 1994 00:05:43 +0000 (-0800)
Subject: BSD 4_4_Lite2 development
X-Git-Tag: BSD-4_4_Lite2~185
X-Git-Url: https://git.subgeniuskitty.com/unix-history/.git/commitdiff_plain/31b138d3c1e521e88d0b043baa24db96cb9497a7

BSD 4_4_Lite2 development
Work on file usr/src/contrib/nvi.1.43/PORT/isc.3/local/mmap.c

Synthesized-from: CSRG/cd3/4.4BSD-Lite2
---

diff --git a/usr/src/contrib/nvi.1.43/PORT/isc.3/local/mmap.c b/usr/src/contrib/nvi.1.43/PORT/isc.3/local/mmap.c
new file mode 100644
index 0000000000..e001026f4e
--- /dev/null
+++ b/usr/src/contrib/nvi.1.43/PORT/isc.3/local/mmap.c
@@ -0,0 +1,42 @@
+#include <sys/types.h>
+
+#include <stdlib.h>
+
+#include "compat.h"
+
+/*
+ * This function emulates mmap() by reading `len' bytes from the file
+ * descriptor `fd' and returning a pointer to that memory.  The "mapped"
+ * region can later be deallocated with munmap().
+ *
+ * Note: ONLY reading is supported and only reading of the exact size
+ * of the file will work.
+ */
+char *
+mmap_hack(addr, len, prot, flags, fd, off)
+	char *addr;
+	size_t len;
+	int prot;
+	int flags;
+	int fd;
+	off_t off;
+{
+	char *ptr;
+
+	if ((ptr = (char *)malloc(len)) == 0)
+		return (-1);
+	if (read(fd, ptr, len) < 0) {
+		free(ptr);
+		return (-1);
+	}
+	return (ptr);
+}
+
+int
+munmap_hack(addr, len)
+	char *addr;
+	size_t len;
+{
+	free(addr);
+	return (0);
+}