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support/support_shared_allocate.c
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Paul Eggert
Update copyright dates with scripts/update-copyrights
02 янв 2026, 00:42
02 янв 2026, 00:42
66f3e92
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/* Allocate a memory region shared across processes. Copyright (C) 2017-2026 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 <https://www.gnu.org/licenses/>. */ #include <errno.h> #include <stddef.h> #include <support/support.h> #include <support/xunistd.h> #include <sys/mman.h> /* Header for the allocation. It contains the size of the allocation for subsequent unmapping. */ struct header { size_t total_size; char data[] __attribute__ ((aligned (__alignof__ (max_align_t)))); }; void * support_shared_allocate (size_t size) { size_t total_size = size + offsetof (struct header, data); if (total_size < size) { errno = ENOMEM; oom_error (__func__, size); return NULL; } else { struct header *result = xmmap (NULL, total_size, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_SHARED, -1); result->total_size = total_size; return &result->data; } } void support_shared_free (void *data) { struct header *header = data - offsetof (struct header, data); xmunmap (header, header->total_size); }