projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 28f540f4 RM |
1 | /* Copyright (C) 1994 Free Software Foundation, Inc. |
| 2 | This file is part of the GNU C Library. | |
| 3 | ||
| 4 | The GNU C Library is free software; you can redistribute it and/or | |
| 5 | modify it under the terms of the GNU Library General Public License as | |
| 6 | published by the Free Software Foundation; either version 2 of the | |
| 7 | License, or (at your option) any later version. | |
| 8 | ||
| 9 | The GNU C Library is distributed in the hope that it will be useful, | |
| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 12 | Library General Public License for more details. | |
| 13 | ||
| 14 | You should have received a copy of the GNU Library General Public | |
| 15 | License along with the GNU C Library; see the file COPYING.LIB. If | |
| 16 | not, write to the Free Software Foundation, Inc., 675 Mass Ave, | |
| 17 | Cambridge, MA 02139, USA. */ | |
| 18 | ||
| 19 | #include <sys/types.h> | |
| 20 | #include <sys/mman.h> | |
| 21 | #include <errno.h> | |
| 22 | #include <hurd.h> | |
| 23 | #include <hurd/fd.h> | |
| 24 | ||
| 25 | /* Map addresses starting near ADDR and extending for LEN bytes. from | |
| 26 | OFFSET into the file FD describes according to PROT and FLAGS. If ADDR | |
| 27 | is nonzero, it is the desired mapping address. If the MAP_FIXED bit is | |
| 28 | set in FLAGS, the mapping will be at ADDR exactly (which must be | |
| 29 | page-aligned); otherwise the system chooses a convenient nearby address. | |
| 30 | The return value is the actual mapping address chosen or (caddr_t) -1 | |
| 31 | for errors (in which case `errno' is set). A successful `mmap' call | |
| 32 | deallocates any previous mapping for the affected region. */ | |
| 33 | ||
| 34 | caddr_t | |
| 35 | mmap (caddr_t addr, size_t len, int prot, int flags, int fd, off_t offset) | |
| 36 | { | |
| 37 | error_t err; | |
| 38 | vm_prot_t vmprot; | |
| 39 | memory_object_t memobj; | |
| 40 | vm_address_t mapaddr; | |
| 41 | ||
| 42 | vmprot = VM_PROT_NONE; | |
| 43 | if (prot & PROT_READ) | |
| 44 | vmprot |= VM_PROT_READ; | |
| 45 | if (prot & PROT_WRITE) | |
| 46 | vmprot |= VM_PROT_WRITE; | |
| 47 | if (prot & PROT_EXEC) | |
| 48 | vmprot |= VM_PROT_EXECUTE; | |
| 49 | ||
| 50 | switch (flags & MAP_TYPE) | |
| 51 | { | |
| 52 | default: | |
| 53 | return (caddr_t) (long int) __hurd_fail (EINVAL); | |
| 54 | ||
| 55 | case MAP_ANON: | |
| 56 | memobj = MACH_PORT_NULL; | |
| 57 | break; | |
| 58 | ||
| 59 | case MAP_FILE: | |
| 60 | { | |
| 61 | mach_port_t robj, wobj; | |
| 62 | if (err = HURD_DPORT_USE (fd, __io_map (port, &robj, &wobj))) | |
| 63 | return (caddr_t) (long int) __hurd_dfail (fd, err); | |
| 64 | switch (prot & (PROT_READ|PROT_WRITE)) | |
| 65 | { | |
| 66 | case PROT_READ: | |
| 67 | memobj = robj; | |
| 68 | __mach_port_deallocate (__mach_task_self (), wobj); | |
| 69 | break; | |
| 70 | case PROT_WRITE: | |
| 71 | memobj = wobj; | |
| 72 | __mach_port_deallocate (__mach_task_self (), robj); | |
| 73 | break; | |
| 74 | case PROT_READ|PROT_WRITE: | |
| 75 | __mach_port_deallocate (__mach_task_self (), robj); | |
| 76 | if (robj == wobj) | |
| 77 | memobj = wobj; | |
| 78 | else | |
| 79 | { | |
| 80 | __mach_port_deallocate (__mach_task_self (), wobj); | |
| 81 | return ((caddr_t) (long int) | |
| 82 | __hurd_fail (EGRATUITOUS)); /* XXX */ | |
| 83 | } | |
| 84 | break; | |
| 85 | } | |
| 86 | break; | |
| 87 | /* XXX handle MAP_NOEXTEND */ | |
| 88 | } | |
| 89 | } | |
| 90 | ||
| 91 | mapaddr = (vm_address_t) addr; | |
| 92 | err = __vm_map (__mach_task_self (), | |
| 93 | &mapaddr, (vm_size_t) len, (vm_address_t) 0, | |
| 94 | flags & MAP_FIXED, | |
| 95 | memobj, (vm_offset_t) offset, | |
| 96 | flags & (MAP_COPY|MAP_PRIVATE), | |
| 97 | vmprot, VM_PROT_ALL, | |
| 98 | flags & MAP_INHERIT); | |
| 99 | ||
| 100 | if (memobj != MACH_PORT_NULL) | |
| 101 | __mach_port_deallocate (__mach_task_self (), memobj); | |
| 102 | ||
| 103 | return err ? (caddr_t) (long int) __hurd_fail (err) : (caddr_t) mapaddr; | |
| 104 | } | |
| 105 |