diff options
Diffstat (limited to 'sysdeps/mach/hurd/mmap.c')
| -rw-r--r-- | sysdeps/mach/hurd/mmap.c | 34 |
1 files changed, 28 insertions, 6 deletions
diff --git a/sysdeps/mach/hurd/mmap.c b/sysdeps/mach/hurd/mmap.c index 0ef847f7c2..f42c4e55c3 100644 --- a/sysdeps/mach/hurd/mmap.c +++ b/sysdeps/mach/hurd/mmap.c @@ -38,6 +38,22 @@ __mmap (caddr_t addr, size_t len, int prot, int flags, int fd, off_t offset) vm_prot_t vmprot; memory_object_t memobj; vm_address_t mapaddr; + vm_size_t pageoff; + + pageoff = offset & (vm_page_size - 1); + offset &= ~(vm_page_size - 1); + + mapaddr = (vm_address_t) addr; + if (flags & MAP_FIXED) + { + /* A specific address is requested. It need not be page-aligned; + it just needs to be congruent with the object offset. */ + if ((mapaddr & (vm_page_size - 1)) != pageoff) + return (caddr_t) (long int) __hurd_fail (EINVAL); + else + /* We will add back PAGEOFF after mapping. */ + mapaddr -= pageoff; + } vmprot = VM_PROT_NONE; if (prot & PROT_READ) @@ -100,16 +116,16 @@ __mmap (caddr_t addr, size_t len, int prot, int flags, int fd, off_t offset) } } - mapaddr = (vm_address_t) addr; + /* XXX handle MAP_INHERIT */ + err = __vm_map (__mach_task_self (), &mapaddr, (vm_size_t) len, (vm_address_t) 0, ! (flags & MAP_FIXED), memobj, (vm_offset_t) offset, - flags & (MAP_COPY|MAP_PRIVATE), + ! (flags & MAP_SHARED), vmprot, VM_PROT_ALL, - (flags & MAP_INHERIT) == 0 ? VM_INHERIT_NONE : - (flags & (MAP_COPY|MAP_PRIVATE)) ? VM_INHERIT_COPY : - VM_INHERIT_SHARE); + (flags & MAP_SHARED) ? VM_INHERIT_SHARE : VM_INHERIT_COPY); + if (err == KERN_NO_SPACE && (flags & MAP_FIXED)) { /* XXX this is not atomic as it is in unix! */ @@ -129,7 +145,13 @@ __mmap (caddr_t addr, size_t len, int prot, int flags, int fd, off_t offset) if (memobj != MACH_PORT_NULL) __mach_port_deallocate (__mach_task_self (), memobj); - return err ? (caddr_t) (long int) __hurd_fail (err) : (caddr_t) mapaddr; + if (err) + return (caddr_t) (long int) __hurd_fail (err); + + /* Adjust the mapping address for the offset-within-page. */ + mapaddr += pageoff; + + return (caddr_t) mapaddr; } weak_alias (__mmap, mmap) |