epoll_create: fail with EINVAL if size is non-positive

[musl] / src / mman / mmap.c

diff --git a/src/mman/mmap.c b/src/mman/mmap.c
index fd2bb07..eff88d8 100644 (file)
--- a/src/mman/mmap.c
+++ b/src/mman/mmap.c
@@ -1,31 +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 dummy1(int x) { }
-static void dummy0(void) { }
-weak_alias(dummy1, __vm_lock);
-weak_alias(dummy0, __vm_unlock);
+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)
 {
-       void *ret;
-       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;
-       if (flags & MAP_FIXED) __vm_lock(-1);
+       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 = (void *)syscall(SYS_mmap2, start, len, prot, flags, fd, off>>12);
+       ret = __syscall(SYS_mmap2, start, len, prot, flags, fd, off/UNIT);
 #else
-       ret = (void *)syscall(SYS_mmap, start, len, prot, flags, fd, off);
+       ret = __syscall(SYS_mmap, start, len, prot, flags, fd, off);
 #endif
-       if (flags & MAP_FIXED) __vm_unlock();
-       return ret;
+       /* 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);