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6285f0881e
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
95 lines
2.3 KiB
C
95 lines
2.3 KiB
C
/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
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#include "../nolibc.h"
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#ifndef _NOLIBC_SYS_SELECT_H
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#define _NOLIBC_SYS_SELECT_H
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#include <linux/time.h>
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#include <linux/unistd.h>
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/* commonly an fd_set represents 256 FDs */
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#ifndef FD_SETSIZE
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#define FD_SETSIZE 256
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#endif
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#define FD_SETIDXMASK (8 * sizeof(unsigned long))
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#define FD_SETBITMASK (8 * sizeof(unsigned long)-1)
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/* for select() */
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typedef struct {
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unsigned long fds[(FD_SETSIZE + FD_SETBITMASK) / FD_SETIDXMASK];
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} fd_set;
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#define FD_CLR(fd, set) do { \
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fd_set *__set = (set); \
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int __fd = (fd); \
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if (__fd >= 0) \
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__set->fds[__fd / FD_SETIDXMASK] &= \
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~(1U << (__fd & FD_SETBITMASK)); \
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} while (0)
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#define FD_SET(fd, set) do { \
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fd_set *__set = (set); \
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int __fd = (fd); \
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if (__fd >= 0) \
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__set->fds[__fd / FD_SETIDXMASK] |= \
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1 << (__fd & FD_SETBITMASK); \
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} while (0)
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#define FD_ISSET(fd, set) ({ \
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fd_set *__set = (set); \
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int __fd = (fd); \
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int __r = 0; \
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if (__fd >= 0) \
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__r = !!(__set->fds[__fd / FD_SETIDXMASK] & \
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1U << (__fd & FD_SETBITMASK)); \
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__r; \
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})
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#define FD_ZERO(set) do { \
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fd_set *__set = (set); \
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int __idx; \
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int __size = (FD_SETSIZE+FD_SETBITMASK) / FD_SETIDXMASK;\
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for (__idx = 0; __idx < __size; __idx++) \
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__set->fds[__idx] = 0; \
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} while (0)
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/*
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* int select(int nfds, fd_set *read_fds, fd_set *write_fds,
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* fd_set *except_fds, struct timeval *timeout);
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*/
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static __attribute__((unused))
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int _sys_select(int nfds, fd_set *rfds, fd_set *wfds, fd_set *efds, struct timeval *timeout)
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{
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#if defined(__NR_pselect6_time64)
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struct __kernel_timespec t;
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if (timeout) {
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t.tv_sec = timeout->tv_sec;
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t.tv_nsec = (uint32_t)timeout->tv_usec * 1000;
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}
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return __nolibc_syscall6(__NR_pselect6_time64, nfds, rfds, wfds, efds,
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timeout ? &t : NULL, NULL);
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#else
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struct __kernel_old_timespec t;
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if (timeout) {
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t.tv_sec = timeout->tv_sec;
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t.tv_nsec = (uint32_t)timeout->tv_usec * 1000;
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}
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return __nolibc_syscall6(__NR_pselect6, nfds, rfds, wfds, efds,
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timeout ? &t : NULL, NULL);
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#endif
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}
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static __attribute__((unused))
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int select(int nfds, fd_set *rfds, fd_set *wfds, fd_set *efds, struct timeval *timeout)
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{
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return __sysret(_sys_select(nfds, rfds, wfds, efds, timeout));
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}
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#endif /* _NOLIBC_SYS_SELECT_H */
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