modernc.org/cc@v1.0.1/v2/headers/linux_amd64/usr/include/sys/select.h (about)

     1  /* `fd_set' type and related macros, and `select'/`pselect' declarations.
     2     Copyright (C) 1996-2015 Free Software Foundation, Inc.
     3     This file is part of the GNU C Library.
     4  
     5     The GNU C Library is free software; you can redistribute it and/or
     6     modify it under the terms of the GNU Lesser General Public
     7     License as published by the Free Software Foundation; either
     8     version 2.1 of the License, or (at your option) any later version.
     9  
    10     The GNU C Library is distributed in the hope that it will be useful,
    11     but WITHOUT ANY WARRANTY; without even the implied warranty of
    12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    13     Lesser General Public License for more details.
    14  
    15     You should have received a copy of the GNU Lesser General Public
    16     License along with the GNU C Library; if not, see
    17     <http://www.gnu.org/licenses/>.  */
    18  
    19  /*	POSIX 1003.1g: 6.2 Select from File Descriptor Sets <sys/select.h>  */
    20  
    21  #ifndef _SYS_SELECT_H
    22  #define _SYS_SELECT_H	1
    23  
    24  #include <features.h>
    25  
    26  /* Get definition of needed basic types.  */
    27  #include <bits/types.h>
    28  
    29  /* Get __FD_* definitions.  */
    30  #include <bits/select.h>
    31  
    32  /* Get __sigset_t.  */
    33  #include <bits/sigset.h>
    34  
    35  #ifndef __sigset_t_defined
    36  # define __sigset_t_defined
    37  typedef __sigset_t sigset_t;
    38  #endif
    39  
    40  /* Get definition of timer specification structures.  */
    41  #define __need_time_t
    42  #define __need_timespec
    43  #include <time.h>
    44  #define __need_timeval
    45  #include <bits/time.h>
    46  
    47  #ifndef __suseconds_t_defined
    48  typedef __suseconds_t suseconds_t;
    49  # define __suseconds_t_defined
    50  #endif
    51  
    52  /* The fd_set member is required to be an array of longs.  */
    53  typedef long int __fd_mask;
    54  
    55  /* Some versions of <linux/posix_types.h> define this macros.  */
    56  #undef	__NFDBITS
    57  /* It's easier to assume 8-bit bytes than to get CHAR_BIT.  */
    58  #define __NFDBITS	(8 * (int) sizeof (__fd_mask))
    59  #define	__FD_ELT(d)	((d) / __NFDBITS)
    60  #define	__FD_MASK(d)	((__fd_mask) (1UL << ((d) % __NFDBITS)))
    61  
    62  /* fd_set for select and pselect.  */
    63  typedef struct {
    64  	/* XPG4.2 requires this member name.  Otherwise avoid the name
    65  	   from the global namespace.  */
    66  #ifdef __USE_XOPEN
    67  	__fd_mask fds_bits[__FD_SETSIZE / __NFDBITS];
    68  # define __FDS_BITS(set) ((set)->fds_bits)
    69  #else
    70  	__fd_mask __fds_bits[__FD_SETSIZE / __NFDBITS];
    71  # define __FDS_BITS(set) ((set)->__fds_bits)
    72  #endif
    73  } fd_set;
    74  
    75  /* Maximum number of file descriptors in `fd_set'.  */
    76  #define	FD_SETSIZE		__FD_SETSIZE
    77  
    78  #ifdef __USE_MISC
    79  /* Sometimes the fd_set member is assumed to have this type.  */
    80  typedef __fd_mask fd_mask;
    81  
    82  /* Number of bits per word of `fd_set' (some code assumes this is 32).  */
    83  # define NFDBITS		__NFDBITS
    84  #endif
    85  
    86  /* Access macros for `fd_set'.  */
    87  #define	FD_SET(fd, fdsetp)	__FD_SET (fd, fdsetp)
    88  #define	FD_CLR(fd, fdsetp)	__FD_CLR (fd, fdsetp)
    89  #define	FD_ISSET(fd, fdsetp)	__FD_ISSET (fd, fdsetp)
    90  #define	FD_ZERO(fdsetp)		__FD_ZERO (fdsetp)
    91  
    92  __BEGIN_DECLS
    93  /* Check the first NFDS descriptors each in READFDS (if not NULL) for read
    94     readiness, in WRITEFDS (if not NULL) for write readiness, and in EXCEPTFDS
    95     (if not NULL) for exceptional conditions.  If TIMEOUT is not NULL, time out
    96     after waiting the interval specified therein.  Returns the number of ready
    97     descriptors, or -1 for errors.
    98  
    99     This function is a cancellation point and therefore not marked with
   100     __THROW.  */
   101  extern int select(int __nfds, fd_set * __restrict __readfds, fd_set * __restrict __writefds, fd_set * __restrict __exceptfds, struct timeval *__restrict __timeout);
   102  
   103  #ifdef __USE_XOPEN2K
   104  /* Same as above only that the TIMEOUT value is given with higher
   105     resolution and a sigmask which is been set temporarily.  This version
   106     should be used.
   107  
   108     This function is a cancellation point and therefore not marked with
   109     __THROW.  */
   110  extern int pselect(int __nfds, fd_set * __restrict __readfds, fd_set * __restrict __writefds, fd_set * __restrict __exceptfds, const struct timespec *__restrict __timeout, const __sigset_t * __restrict __sigmask);
   111  #endif
   112  
   113  /* Define some inlines helping to catch common problems.  */
   114  #if __USE_FORTIFY_LEVEL > 0 && defined __GNUC__
   115  # include <bits/select2.h>
   116  #endif
   117  
   118  __END_DECLS
   119  #endif				/* sys/select.h */