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ab386f3cdb
To cut down on the boilerplate, an unref-able struct variable can now be declared as _unref_(type) *name = NULL; which is the equivalent of _cleanup_(type_unrefp) struct type *name = NULL; Let's see how that style ends up reading. This means we can get rid of the custom _cleanup_foo_ functions everywhere, no need for all the extra #defines etc. A somewhat special case is systemd which defines the various unrefp functions for us in the headers, so we can use them directly. OBJECT_IMPLEMENT_UNREF now also creates the unrefp function for this object - this of course conflicts where DECLARE_UNREF_CLEANUP_FUNC is in scope. Not a problem so far, let's see how we go. Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
82 lines
2.2 KiB
C
82 lines
2.2 KiB
C
/*
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* Copyright © 2020 Red Hat, Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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#include "config.h"
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#include <stddef.h>
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#include <unistd.h>
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#include <sys/mman.h>
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#include <fcntl.h>
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#include "util-memfile.h"
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#include "util-mem.h"
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#include "util-io.h"
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#include "util-object.h"
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struct memfile {
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struct object object;
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int fd;
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size_t size;
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};
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static void
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memfile_destroy(struct memfile *memfile)
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{
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if (memfile->fd != -1)
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close(memfile->fd);
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}
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static
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OBJECT_IMPLEMENT_CREATE(memfile);
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OBJECT_IMPLEMENT_UNREF(memfile);
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OBJECT_IMPLEMENT_REF(memfile);
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OBJECT_IMPLEMENT_GETTER(memfile, fd, int);
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OBJECT_IMPLEMENT_GETTER(memfile, size, size_t);
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struct memfile *
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memfile_new(const char *data, size_t sz) {
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_unref_(memfile) *memfile = memfile_create(NULL);
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_cleanup_close_ int fd = memfd_create("memfile", MFD_CLOEXEC|MFD_ALLOW_SEALING);
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if (fd < 0)
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return NULL;
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fcntl(fd, F_ADD_SEALS, F_SEAL_SHRINK);
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int rc = posix_fallocate(fd, 0, sz);
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if (rc < 0)
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return NULL;
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memfile->fd = fd;
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memfile->size = sz;
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fd = -1;
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void *map = mmap(NULL, sz, PROT_READ|PROT_WRITE, MAP_SHARED, memfile->fd, 0);
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if (map == MAP_FAILED)
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return NULL;
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memcpy(map, data, sz);
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munmap(map, sz);
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return steal(&memfile);
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}
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