/usr/include/asterisk/select.h is in asterisk-dev 1:1.8.10.1~dfsg-1ubuntu1.
This file is owned by root:root, with mode 0o644.
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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 | /*
* Asterisk -- An open source telephony toolkit.
*
* Copyright (C) 2010, Digium, Inc.
*
* Tilghman Lesher <tlesher AT digium DOT com>
*
* See http://www.asterisk.org for more information about
* the Asterisk project. Please do not directly contact
* any of the maintainers of this project for assistance;
* the project provides a web site, mailing lists and IRC
* channels for your use.
*
* This program is free software, distributed under the terms of
* the GNU General Public License Version 2. See the LICENSE file
* at the top of the source tree.
*/
/*!\file
* \brief Bitfield expansions for ast_select
*/
#ifndef __AST_SELECT_H
#define __AST_SELECT_H
#include <sys/time.h>
#include <sys/select.h>
#include <errno.h>
#include "asterisk/compat.h"
#ifdef __cplusplus
extern "C" {
#endif
extern unsigned int ast_FD_SETSIZE;
#if !defined(HAVE_VARIABLE_FDSET) && defined(CONFIGURE_RAN_AS_ROOT)
#define ast_fdset fd_set
#else
#define ast_FDMAX 32768
typedef struct {
TYPEOF_FD_SET_FDS_BITS fds_bits[ast_FDMAX / 8 / SIZEOF_FD_SET_FDS_BITS]; /* 32768 bits */
} ast_fdset;
#define _bitsize(a) (sizeof(a) * 8)
#undef FD_ZERO
#define FD_ZERO(a) \
do { \
TYPEOF_FD_SET_FDS_BITS *bytes = (TYPEOF_FD_SET_FDS_BITS *) a; \
int i; \
for (i = 0; i < ast_FDMAX / _bitsize(TYPEOF_FD_SET_FDS_BITS); i++) { \
bytes[i] = 0; \
} \
} while (0)
#undef FD_SET
#define FD_SET(fd, fds) \
do { \
TYPEOF_FD_SET_FDS_BITS *bytes = (TYPEOF_FD_SET_FDS_BITS *) fds; \
/* 32bit: FD / 32 + ((FD + 1) % 32 ? 1 : 0) < 1024 */ \
/* 64bit: FD / 64 + ((FD + 1) % 64 ? 1 : 0) < 512 */ \
if (fd / _bitsize(*bytes) + ((fd + 1) % _bitsize(*bytes) ? 1 : 0) < sizeof(*(fds)) / SIZEOF_FD_SET_FDS_BITS) { \
bytes[fd / _bitsize(*bytes)] |= ((TYPEOF_FD_SET_FDS_BITS) 1) << (fd % _bitsize(*bytes)); \
} else { \
fprintf(stderr, "FD %d exceeds the maximum size of ast_fdset!\n", fd); \
} \
} while (0)
#endif /* HAVE_VARIABLE_FDSET */
/*! \brief Waits for activity on a group of channels
* \param nfds the maximum number of file descriptors in the sets
* \param rfds file descriptors to check for read availability
* \param wfds file descriptors to check for write availability
* \param efds file descriptors to check for exceptions (OOB data)
* \param tvp timeout while waiting for events
* This is the same as a standard select(), except it guarantees the
* behaviour where the passed struct timeval is updated with how much
* time was not slept while waiting for the specified events
*/
static inline int ast_select(int nfds, ast_fdset *rfds, ast_fdset *wfds, ast_fdset *efds, struct timeval *tvp)
{
#ifdef __linux__
return select(nfds, (fd_set *) rfds, (fd_set *) wfds, (fd_set *) efds, tvp);
#else
int save_errno = 0;
if (tvp) {
struct timeval tv, tvstart, tvend, tvlen;
int res;
tv = *tvp;
gettimeofday(&tvstart, NULL);
res = select(nfds, (fd_set *) rfds, (fd_set *) wfds, (fd_set *) efds, tvp);
save_errno = errno;
gettimeofday(&tvend, NULL);
timersub(&tvend, &tvstart, &tvlen);
timersub(&tv, &tvlen, tvp);
if (tvp->tv_sec < 0 || (tvp->tv_sec == 0 && tvp->tv_usec < 0)) {
tvp->tv_sec = 0;
tvp->tv_usec = 0;
}
errno = save_errno;
return res;
}
else
return select(nfds, (fd_set *) rfds, (fd_set *) wfds, (fd_set *) efds, NULL);
#endif
}
#ifdef __cplusplus
}
#endif
#endif /* __AST_SELECT_H */
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