/usr/include/xenomai/nucleus/select.h is in libxenomai-dev 2.6.4+dfsg-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 | /*!\file nucleus/select.h
* \brief file descriptors events multiplexing header.
* \author Gilles Chanteperdrix
*
* Copyright (C) 2008 Efixo <gilles.chanteperdrix@xenomai.org>
*
* Xenomai is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published
* by the Free Software Foundation; either version 2 of the License,
* or (at your option) any later version.
*
* Xenomai 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
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Xenomai; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, USA.
*
* \ingroup select
*/
#ifndef XNSELECT_H
#define XNSELECT_H
/*! \addtogroup select
*@{*/
#include <nucleus/thread.h>
#define XNSELECT_READ 0
#define XNSELECT_WRITE 1
#define XNSELECT_EXCEPT 2
#define XNSELECT_MAX_TYPES 3
struct xnselector {
xnsynch_t synchbase;
struct fds {
fd_set expected;
fd_set pending;
} fds [XNSELECT_MAX_TYPES];
xnholder_t destroy_link;
xnqueue_t bindings; /* only used by xnselector_destroy */
};
#define __NFDBITS__ (8 * sizeof(unsigned long))
#define __FDSET_LONGS__ (__FD_SETSIZE/__NFDBITS__)
#define __FDELT__(d) ((d) / __NFDBITS__)
#define __FDMASK__(d) (1UL << ((d) % __NFDBITS__))
static inline void __FD_SET__(unsigned long __fd, __kernel_fd_set *__fdsetp)
{
unsigned long __tmp = __fd / __NFDBITS__;
unsigned long __rem = __fd % __NFDBITS__;
__fdsetp->fds_bits[__tmp] |= (1UL<<__rem);
}
static inline void __FD_CLR__(unsigned long __fd, __kernel_fd_set *__fdsetp)
{
unsigned long __tmp = __fd / __NFDBITS__;
unsigned long __rem = __fd % __NFDBITS__;
__fdsetp->fds_bits[__tmp] &= ~(1UL<<__rem);
}
static inline int __FD_ISSET__(unsigned long __fd, const __kernel_fd_set *__p)
{
unsigned long __tmp = __fd / __NFDBITS__;
unsigned long __rem = __fd % __NFDBITS__;
return (__p->fds_bits[__tmp] & (1UL<<__rem)) != 0;
}
static inline void __FD_ZERO__(__kernel_fd_set *__p)
{
unsigned long *__tmp = __p->fds_bits;
int __i;
__i = __FDSET_LONGS__;
while (__i) {
__i--;
*__tmp = 0;
__tmp++;
}
}
#ifdef CONFIG_XENO_OPT_SELECT
struct xnselect {
xnqueue_t bindings;
};
#define DECLARE_XNSELECT(name) struct xnselect name
struct xnselect_binding {
struct xnselector *selector;
struct xnselect *fd;
unsigned type;
unsigned bit_index;
xnholder_t link; /* link in selected fds list. */
xnholder_t slink; /* link in selector list */
};
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
void xnselect_init(struct xnselect *select_block);
int xnselect_bind(struct xnselect *select_block,
struct xnselect_binding *binding,
struct xnselector *selector,
unsigned type,
unsigned bit_index,
unsigned state);
int __xnselect_signal(struct xnselect *select_block, unsigned state);
/**
* Signal a file descriptor state change.
*
* @param select_block pointer to an @a xnselect structure representing the file
* descriptor whose state changed;
* @param state new value of the state.
*
* @retval 1 if rescheduling is needed;
* @retval 0 otherwise.
*/
static inline int
xnselect_signal(struct xnselect *select_block, unsigned state)
{
if (!emptyq_p(&select_block->bindings))
return __xnselect_signal(select_block, state);
return 0;
}
void xnselect_destroy(struct xnselect *select_block);
int xnselector_init(struct xnselector *selector);
int xnselect(struct xnselector *selector,
fd_set *out_fds[XNSELECT_MAX_TYPES],
fd_set *in_fds[XNSELECT_MAX_TYPES],
int nfds,
xnticks_t timeout, xntmode_t timeout_mode);
void xnselector_destroy(struct xnselector *selector);
int xnselect_mount(void);
int xnselect_umount(void);
#ifdef __cplusplus
}
#endif /* __cplusplus */
#else /* !CONFIG_XENO_OPT_SELECT */
struct xnselector;
#define DECLARE_XNSELECT(name)
#define xnselect_init(block)
#define xnselect_bind(select_block,binding,selector,type,bit_index,state) \
({ -EBADF; })
#define xnselect_signal(block, state) ({ int __ret = 0; __ret; })
#define xnselect_destroy(block)
#endif /* !CONFIG_XENO_OPT_SELECT */
/*@}*/
#endif /* XNSELECT_H */
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