mirror of
https://gitlab.freedesktop.org/pipewire/pipewire.git
synced 2026-07-04 00:06:43 -04:00
d3368ee0d5
Unknown preprocessor symbols are replaced with 0 in preprocessor
conditionals, so if `__has_attribute()` is not supported, then
the condition will be the following:
if 0 && 0(__cleanup__)
which is syntactically incorrect.
So split the condition and only check `__has_attribute()` if
it exists.
Fixes: 65d949558b ("spa: utils: add scope based resource cleanup")
Fixes #4962
128 lines
3.1 KiB
C
128 lines
3.1 KiB
C
/* Simple Plugin API */
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/* SPDX-FileCopyrightText: Copyright © 2023 PipeWire authors */
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/* SPDX-License-Identifier: MIT */
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#ifndef SPA_UTILS_CLEANUP_H
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#define SPA_UTILS_CLEANUP_H
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#define spa_exchange(var, new_value) \
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__extension__ ({ \
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__typeof__(var) *_ptr_ = &(var); \
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__typeof__(var) _old_value_ = *_ptr_; \
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*_ptr_ = (new_value); \
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_old_value_; \
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})
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/* ========================================================================== */
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#if __GNUC__ >= 10 || defined(__clang__)
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#define spa_steal_ptr(ptr) ((__typeof__(*(ptr)) *) spa_exchange((ptr), NULL))
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#else
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#define spa_steal_ptr(ptr) spa_exchange((ptr), NULL)
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#endif
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#define spa_clear_ptr(ptr, destructor) \
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__extension__ ({ \
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__typeof__(ptr) _old_value = spa_steal_ptr(ptr); \
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if (_old_value) \
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destructor(_old_value); \
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(void) 0; \
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})
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/* ========================================================================== */
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#include <errno.h>
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#include <unistd.h>
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#define spa_steal_fd(fd) spa_exchange((fd), -1)
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#define spa_clear_fd(fd) \
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__extension__ ({ \
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int _old_value = spa_steal_fd(fd), _res = 0; \
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if (_old_value >= 0) \
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_res = close(_old_value); \
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_res; \
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})
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/* ========================================================================== */
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#ifdef __has_attribute
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#if __has_attribute(__cleanup__)
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#define spa_cleanup(func) __attribute__((__cleanup__(func)))
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#endif
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#endif
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#ifdef spa_cleanup
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#define SPA_DEFINE_AUTO_CLEANUP(name, type, ...) \
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typedef __typeof__(type) _spa_auto_cleanup_type_ ## name; \
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static inline void _spa_auto_cleanup_func_ ## name (__typeof__(type) *thing) \
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{ \
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int _save_errno = errno; \
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__VA_ARGS__ \
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errno = _save_errno; \
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}
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#define spa_auto(name) \
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spa_cleanup(_spa_auto_cleanup_func_ ## name) \
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_spa_auto_cleanup_type_ ## name
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#define SPA_DEFINE_AUTOPTR_CLEANUP(name, type, ...) \
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typedef __typeof__(type) * _spa_autoptr_cleanup_type_ ## name; \
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static inline void _spa_autoptr_cleanup_func_ ## name (__typeof__(type) **thing) \
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{ \
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int _save_errno = errno; \
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__VA_ARGS__ \
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errno = _save_errno; \
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}
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#define spa_autoptr(name) \
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spa_cleanup(_spa_autoptr_cleanup_func_ ## name) \
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_spa_autoptr_cleanup_type_ ## name
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/* ========================================================================== */
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#include <stdlib.h>
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static inline void _spa_autofree_cleanup_func(void *p)
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{
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int save_errno = errno;
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free(*(void **) p);
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errno = save_errno;
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}
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#define spa_autofree spa_cleanup(_spa_autofree_cleanup_func)
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/* ========================================================================== */
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static inline void _spa_autoclose_cleanup_func(int *fd)
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{
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int save_errno = errno;
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spa_clear_fd(*fd);
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errno = save_errno;
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}
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#define spa_autoclose spa_cleanup(_spa_autoclose_cleanup_func)
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/* ========================================================================== */
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#include <stdio.h>
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SPA_DEFINE_AUTOPTR_CLEANUP(FILE, FILE, {
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spa_clear_ptr(*thing, fclose);
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})
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/* ========================================================================== */
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#include <dirent.h>
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SPA_DEFINE_AUTOPTR_CLEANUP(DIR, DIR, {
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spa_clear_ptr(*thing, closedir);
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})
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#else
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#define SPA_DEFINE_AUTO_CLEANUP(name, type, ...)
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#define SPA_DEFINE_AUTOPTR_CLEANUP(name, type, ...)
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#endif
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#endif /* SPA_UTILS_CLEANUP_H */
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