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| -rw-r--r-- | ChangeLog | 4 | ||||
| -rw-r--r-- | sysdeps/mach/hurd/msync.c | 93 |
2 files changed, 97 insertions, 0 deletions
diff --git a/ChangeLog b/ChangeLog index 497f5b721c..ef268e8337 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,3 +1,7 @@ +2018-11-03 Samuel Thibault <samuel.thibault@ens-lyon.org> + + * sysdeps/mach/hurd/msync.c: New file. + 2018-11-02 Florian Weimer <fweimer@redhat.com> * support/shell-container.c (copy_func): Call diff --git a/sysdeps/mach/hurd/msync.c b/sysdeps/mach/hurd/msync.c new file mode 100644 index 0000000000..3e41503ece --- /dev/null +++ b/sysdeps/mach/hurd/msync.c @@ -0,0 +1,93 @@ +/* msync -- Synchronize mapped memory to external storage. Mach version. + Copyright (C) 2002-2018 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 + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <http://www.gnu.org/licenses/>. */ + +#include <sys/types.h> +#include <sys/mman.h> +#include <errno.h> + +#include <hurd/hurd.h> + +/* Synchronize the region starting at ADDR and extending LEN bytes with the + file it maps. Filesystem operations on a file being mapped are + unpredictable before this is done. */ + +int +msync (void *addr, size_t length, int flags) +{ + boolean_t should_flush = flags & MS_INVALIDATE ? 1 : 0; + boolean_t should_iosync = flags & MS_ASYNC ? 0 : 1; + + vm_address_t cur = (vm_address_t) addr; + vm_address_t target = cur + length; + + vm_size_t len; + vm_prot_t prot; + vm_prot_t max_prot; + vm_inherit_t inherit; + boolean_t shared; + memory_object_name_t obj; + vm_offset_t offset; + + kern_return_t err; + + if (flags & (MS_SYNC | MS_ASYNC) == (MS_SYNC | MS_ASYNC)) + return __hurd_fail (EINVAL); + + while (cur < target) + { + vm_address_t begin = cur; + + err = __vm_region (__mach_task_self (), + &begin, &len, &prot, &max_prot, &inherit, + &shared, &obj, &offset) + + if (err != KERN_SUCCESS) + return __hurd_fail (err); + + if (begin > cur) + /* We were given an address before the first region, + or we found a hole. */ + cur = begin; + + if (cur >= target) + /* We were given an ending address within a hole. */ + break; + + if (MACH_PORT_VALID (obj)) + { + vm_size_t sync_len; + + if (begin + len > target) + sync_len = target - begin; + else + sync_len = len; + + err = __vm_object_sync (obj, cur - begin + offset, sync_len, + should_flush, 1, should_iosync); + __mach_port_deallocate (__mach_task_self (), obj); + + if (err) + return __hurd_fail (err); + + } + + cur = begin + len; + } + + return 0; +} |