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The sys_foo() naming scheme used by the syscall wrappers may collide with application symbols. Especially as 'sys_' is an obvious naming scheme an application may choose for its own custom systemcall wrappers. Avoid these conflicts by using an leading underscore which moves the names into the implementation's namespace. This naming scheme was chosen over a '__nolibc_' prefix, as these functions are not an implementation detail but a documented interface meant to be used by applications. While this may break some existing users, adapting them should be straightforward. Given that nolibc is most-likely vendored, no unexpected breakage should happen. No in-tree users are affected. These conflicts happen when compiling some of the kernel selftests with nolibc. Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260319-nolibc-namespacing-v1-1-33c22eaddb5e@weissschuh.net
78 lines
1.7 KiB
C
78 lines
1.7 KiB
C
/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
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/*
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* mm definition for NOLIBC
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* Copyright (C) 2017-2021 Willy Tarreau <w@1wt.eu>
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*/
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/* make sure to include all global symbols */
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#include "../nolibc.h"
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#ifndef _NOLIBC_SYS_MMAN_H
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#define _NOLIBC_SYS_MMAN_H
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#include "../arch.h"
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#include "../sys.h"
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#ifndef _sys_mmap
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static __attribute__((unused))
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void *_sys_mmap(void *addr, size_t length, int prot, int flags, int fd,
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off_t offset)
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{
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int n;
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#if defined(__NR_mmap2)
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n = __NR_mmap2;
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offset >>= 12;
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#else
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n = __NR_mmap;
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#endif
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return (void *)__nolibc_syscall6(n, addr, length, prot, flags, fd, offset);
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}
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#endif
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static __attribute__((unused))
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void *mmap(void *addr, size_t length, int prot, int flags, int fd, off_t offset)
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{
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void *ret = _sys_mmap(addr, length, prot, flags, fd, offset);
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if ((unsigned long)ret >= -4095UL) {
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SET_ERRNO(-(long)ret);
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ret = MAP_FAILED;
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}
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return ret;
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}
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static __attribute__((unused))
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void *_sys_mremap(void *old_address, size_t old_size, size_t new_size, int flags, void *new_address)
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{
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return (void *)__nolibc_syscall5(__NR_mremap, old_address, old_size,
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new_size, flags, new_address);
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}
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static __attribute__((unused))
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void *mremap(void *old_address, size_t old_size, size_t new_size, int flags, void *new_address)
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{
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void *ret = _sys_mremap(old_address, old_size, new_size, flags, new_address);
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if ((unsigned long)ret >= -4095UL) {
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SET_ERRNO(-(long)ret);
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ret = MAP_FAILED;
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}
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return ret;
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}
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static __attribute__((unused))
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int _sys_munmap(void *addr, size_t length)
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{
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return __nolibc_syscall2(__NR_munmap, addr, length);
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}
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static __attribute__((unused))
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int munmap(void *addr, size_t length)
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{
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return __sysret(_sys_munmap(addr, length));
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}
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#endif /* _NOLIBC_SYS_MMAN_H */
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