diff options
Diffstat (limited to 'sysdeps/mach/hurd/mmap.c')
| -rw-r--r-- | sysdeps/mach/hurd/mmap.c | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/sysdeps/mach/hurd/mmap.c b/sysdeps/mach/hurd/mmap.c index 6ee314603b..c6ddb39765 100644 --- a/sysdeps/mach/hurd/mmap.c +++ b/sysdeps/mach/hurd/mmap.c @@ -1,4 +1,4 @@ -/* Copyright (C) 1994-2013 Free Software Foundation, Inc. +/* Copyright (C) 1994-2014 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or @@ -97,6 +97,13 @@ __mmap (__ptr_t addr, size_t len, int prot, int flags, int fd, off_t offset) } switch (prot & (PROT_READ|PROT_WRITE)) { + /* Although it apparently doesn't make sense to map a file with + protection set to PROT_NONE, it is actually sometimes done. + In particular, that's how localedef reserves some space for + the locale archive file, the rationale being that some + implementations take into account whether the mapping is + anonymous or not when selecting addresses. */ + case PROT_NONE: case PROT_READ: memobj = robj; if (wobj != MACH_PORT_NULL) @@ -126,8 +133,8 @@ __mmap (__ptr_t addr, size_t len, int prot, int flags, int fd, off_t offset) return (__ptr_t) (long int) __hurd_fail (EACCES); } break; - default: /* impossible */ - return 0; + default: + __builtin_unreachable (); } break; /* XXX handle MAP_NOEXTEND */ |