X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=src%2Fmman%2Fmmap.c;h=eff88d82a8fcff843247a5436f42016690daac24;hb=1ef37aa00ea830dfda76e04e3d941cafa74d8b76;hp=5be6e12de13abaaae2f3af473d6c559216e4821f;hpb=2cdfb7ca26f46f151afbc23d5d94fc68597137f5;p=musl

diff --git a/src/mman/mmap.c b/src/mman/mmap.c
index 5be6e12d..eff88d82 100644
--- a/src/mman/mmap.c
+++ b/src/mman/mmap.c
@@ -1,22 +1,41 @@
 #include <unistd.h>
 #include <sys/mman.h>
 #include <errno.h>
+#include <stdint.h>
 #include <limits.h>
 #include "syscall.h"
-#include "libc.h"
+
+static void dummy(void) { }
+weak_alias(dummy, __vm_wait);
+
+#define UNIT SYSCALL_MMAP2_UNIT
+#define OFF_MASK ((-0x2000ULL << (8*sizeof(syscall_arg_t)-1)) | (UNIT-1))
 
 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 *)syscall6(__NR_mmap2, (long)start, len, prot, flags, fd, off>>12);
+	long ret;
+	if (off & OFF_MASK) {
+		errno = EINVAL;
+		return MAP_FAILED;
+	}
+	if (len >= PTRDIFF_MAX) {
+		errno = ENOMEM;
+		return MAP_FAILED;
+	}
+	if (flags & MAP_FIXED) {
+		__vm_wait();
+	}
+#ifdef SYS_mmap2
+	ret = __syscall(SYS_mmap2, start, len, prot, flags, fd, off/UNIT);
 #else
-	return (void *)syscall6(__NR_mmap, (long)start, len, prot, flags, fd, off);
+	ret = __syscall(SYS_mmap, start, len, prot, flags, fd, off);
 #endif
+	/* Fixup incorrect EPERM from kernel. */
+	if (ret == -EPERM && !start && (flags&MAP_ANON) && !(flags&MAP_FIXED))
+		ret = -ENOMEM;
+	return (void *)__syscall_ret(ret);
 }
 
 weak_alias(__mmap, mmap);
 
-LFS64(mmap);
+weak_alias(mmap, mmap64);