/* `fd_set' type and related macros, and `select'/`pselect' declarations.

[0] Fix | Delete

Copyright (C) 1996-2018 Free Software Foundation, Inc.

[1] Fix | Delete

This file is part of the GNU C Library.

[2] Fix | Delete

[3] Fix | Delete

The GNU C Library is free software; you can redistribute it and/or

[4] Fix | Delete

modify it under the terms of the GNU Lesser General Public

[5] Fix | Delete

License as published by the Free Software Foundation; either

[6] Fix | Delete

version 2.1 of the License, or (at your option) any later version.

[7] Fix | Delete

[8] Fix | Delete

The GNU C Library is distributed in the hope that it will be useful,

[9] Fix | Delete

but WITHOUT ANY WARRANTY; without even the implied warranty of

[10] Fix | Delete

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

[11] Fix | Delete

Lesser General Public License for more details.

[12] Fix | Delete

[13] Fix | Delete

You should have received a copy of the GNU Lesser General Public

[14] Fix | Delete

License along with the GNU C Library; if not, see

[15] Fix | Delete

<http://www.gnu.org/licenses/>. */

[16] Fix | Delete

[17] Fix | Delete

/* POSIX 1003.1g: 6.2 Select from File Descriptor Sets <sys/select.h> */

[18] Fix | Delete

[19] Fix | Delete

#ifndef _SYS_SELECT_H

[20] Fix | Delete

#define _SYS_SELECT_H 1

[21] Fix | Delete

[22] Fix | Delete

#include <features.h>

[23] Fix | Delete

[24] Fix | Delete

/* Get definition of needed basic types. */

[25] Fix | Delete

#include <bits/types.h>

[26] Fix | Delete

[27] Fix | Delete

/* Get __FD_* definitions. */

[28] Fix | Delete

#include <bits/select.h>

[29] Fix | Delete

[30] Fix | Delete

/* Get sigset_t. */

[31] Fix | Delete

#include <bits/types/sigset_t.h>

[32] Fix | Delete

[33] Fix | Delete

/* Get definition of timer specification structures. */

[34] Fix | Delete

#include <bits/types/time_t.h>

[35] Fix | Delete

#include <bits/types/struct_timeval.h>

[36] Fix | Delete

#ifdef __USE_XOPEN2K

[37] Fix | Delete

# include <bits/types/struct_timespec.h>

[38] Fix | Delete

#endif

[39] Fix | Delete

[40] Fix | Delete

#ifndef __suseconds_t_defined

[41] Fix | Delete

typedef __suseconds_t suseconds_t;

[42] Fix | Delete

# define __suseconds_t_defined

[43] Fix | Delete

#endif

[44] Fix | Delete

[45] Fix | Delete

[46] Fix | Delete

/* The fd_set member is required to be an array of longs. */

[47] Fix | Delete

typedef long int __fd_mask;

[48] Fix | Delete

[49] Fix | Delete

/* Some versions of <linux/posix_types.h> define this macros. */

[50] Fix | Delete

#undef __NFDBITS

[51] Fix | Delete

/* It's easier to assume 8-bit bytes than to get CHAR_BIT. */

[52] Fix | Delete

#define __NFDBITS (8 * (int) sizeof (__fd_mask))

[53] Fix | Delete

#define __FD_ELT(d) ((d) / __NFDBITS)

[54] Fix | Delete

#define __FD_MASK(d) ((__fd_mask) (1UL << ((d) % __NFDBITS)))

[55] Fix | Delete

[56] Fix | Delete

/* fd_set for select and pselect. */

[57] Fix | Delete

typedef struct

[58] Fix | Delete

{

[59] Fix | Delete

/* XPG4.2 requires this member name. Otherwise avoid the name

[60] Fix | Delete

from the global namespace. */

[61] Fix | Delete

#ifdef __USE_XOPEN

[62] Fix | Delete

__fd_mask fds_bits[__FD_SETSIZE / __NFDBITS];

[63] Fix | Delete

# define __FDS_BITS(set) ((set)->fds_bits)

[64] Fix | Delete

#else

[65] Fix | Delete

__fd_mask __fds_bits[__FD_SETSIZE / __NFDBITS];

[66] Fix | Delete

# define __FDS_BITS(set) ((set)->__fds_bits)

[67] Fix | Delete

#endif

[68] Fix | Delete

} fd_set;

[69] Fix | Delete

[70] Fix | Delete

/* Maximum number of file descriptors in `fd_set'. */

[71] Fix | Delete

#define FD_SETSIZE __FD_SETSIZE

[72] Fix | Delete

[73] Fix | Delete

#ifdef __USE_MISC

[74] Fix | Delete

/* Sometimes the fd_set member is assumed to have this type. */

[75] Fix | Delete

typedef __fd_mask fd_mask;

[76] Fix | Delete

[77] Fix | Delete

/* Number of bits per word of `fd_set' (some code assumes this is 32). */

[78] Fix | Delete

# define NFDBITS __NFDBITS

[79] Fix | Delete

#endif

[80] Fix | Delete

[81] Fix | Delete

[82] Fix | Delete

/* Access macros for `fd_set'. */

[83] Fix | Delete

#define FD_SET(fd, fdsetp) __FD_SET (fd, fdsetp)

[84] Fix | Delete

#define FD_CLR(fd, fdsetp) __FD_CLR (fd, fdsetp)

[85] Fix | Delete

#define FD_ISSET(fd, fdsetp) __FD_ISSET (fd, fdsetp)

[86] Fix | Delete

#define FD_ZERO(fdsetp) __FD_ZERO (fdsetp)

[87] Fix | Delete

[88] Fix | Delete

[89] Fix | Delete

__BEGIN_DECLS

[90] Fix | Delete

[91] Fix | Delete

/* Check the first NFDS descriptors each in READFDS (if not NULL) for read

[92] Fix | Delete

readiness, in WRITEFDS (if not NULL) for write readiness, and in EXCEPTFDS

[93] Fix | Delete

(if not NULL) for exceptional conditions. If TIMEOUT is not NULL, time out

[94] Fix | Delete

after waiting the interval specified therein. Returns the number of ready

[95] Fix | Delete

descriptors, or -1 for errors.

[96] Fix | Delete

[97] Fix | Delete

This function is a cancellation point and therefore not marked with

[98] Fix | Delete

__THROW. */

[99] Fix | Delete

extern int select (int __nfds, fd_set *__restrict __readfds,

[100] Fix | Delete

fd_set *__restrict __writefds,

[101] Fix | Delete

fd_set *__restrict __exceptfds,

[102] Fix | Delete

struct timeval *__restrict __timeout);

[103] Fix | Delete

[104] Fix | Delete

#ifdef __USE_XOPEN2K

[105] Fix | Delete

/* Same as above only that the TIMEOUT value is given with higher

[106] Fix | Delete

resolution and a sigmask which is been set temporarily. This version

[107] Fix | Delete

should be used.

[108] Fix | Delete

[109] Fix | Delete

This function is a cancellation point and therefore not marked with

[110] Fix | Delete

__THROW. */

[111] Fix | Delete

extern int pselect (int __nfds, fd_set *__restrict __readfds,

[112] Fix | Delete

fd_set *__restrict __writefds,

[113] Fix | Delete

fd_set *__restrict __exceptfds,

[114] Fix | Delete

const struct timespec *__restrict __timeout,

[115] Fix | Delete

const __sigset_t *__restrict __sigmask);

[116] Fix | Delete

#endif

[117] Fix | Delete

[118] Fix | Delete

[119] Fix | Delete

/* Define some inlines helping to catch common problems. */

[120] Fix | Delete

#if __USE_FORTIFY_LEVEL > 0 && defined __GNUC__

[121] Fix | Delete

# include <bits/select2.h>

[122] Fix | Delete

#endif

[123] Fix | Delete

[124] Fix | Delete

__END_DECLS

[125] Fix | Delete

[126] Fix | Delete

#endif /* sys/select.h */

[127] Fix | Delete

[128] Fix | Delete