X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=src%2Fmman%2Fmmap.c;h=b56cff86b6da4b9265b3a1350fb4ea54c0f46015;hb=c5faf1bf09c01641e74844c4bfb0f129bc3974a1;hp=0b092ae24747b8f7c89cbc4816470a3e8dc1d5d1;hpb=aa398f56fa398f2202b04e82c67f822f3233786f;p=musl

diff --git a/src/mman/mmap.c b/src/mman/mmap.c
index 0b092ae2..b56cff86 100644
--- a/src/mman/mmap.c
+++ b/src/mman/mmap.c
@@ -1,20 +1,38 @@
 #include <unistd.h>
 #include <sys/mman.h>
 #include <errno.h>
+#include <stdint.h>
 #include <limits.h>
 #include "syscall.h"
 #include "libc.h"
 
+static void dummy1(int x) { }
+static void dummy0(void) { }
+weak_alias(dummy1, __vm_lock);
+weak_alias(dummy0, __vm_unlock);
+
+#define OFF_MASK ((-0x2000ULL << (8*sizeof(long)-1)) | 0xfff)
+
 void *__mmap(void *start, size_t len, int prot, int flags, int fd, off_t off)
 {
-	if (sizeof(off_t) > sizeof(long))
-		if (((long)off & 0xfff) | ((long)((unsigned long long)off>>(12 + 8*(sizeof(off_t)-sizeof(long))))))
-			start = (void *)-1;
-#ifdef __NR_mmap2
-	return (void *)syscall(SYS_mmap2, start, len, prot, flags, fd, off>>12);
+	void *ret;
+
+	if (off & OFF_MASK) {
+		errno = EINVAL;
+		return MAP_FAILED;
+	}
+	if (len >= PTRDIFF_MAX) {
+		errno = ENOMEM;
+		return MAP_FAILED;
+	}
+	if (flags & MAP_FIXED) __vm_lock(-1);
+#ifdef SYS_mmap2
+	ret = (void *)syscall(SYS_mmap2, start, len, prot, flags, fd, off>>12);
 #else
-	return (void *)syscall(SYS_mmap, start, len, prot, flags, fd, off);
+	ret = (void *)syscall(SYS_mmap, start, len, prot, flags, fd, off);
 #endif
+	if (flags & MAP_FIXED) __vm_unlock();
+	return ret;
 }
 
 weak_alias(__mmap, mmap);