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NAME

       sys/select.h - select types

SYNOPSIS

       #include <sys/select.h>

DESCRIPTION

       The  <sys/select.h>  header  shall  define  the  timeval structure that
       includes at least the following members:

              time_t         tv_sec      Seconds.
              suseconds_t    tv_usec     Microseconds.

       The time_t and suseconds_t types  shall  be  defined  as  described  in
       <sys/types.h> .

       The sigset_t type shall be defined as described in <signal.h> .

       The timespec structure shall be defined as described in <time.h> .

       The  <sys/select.h> header shall define the fd_set type as a structure.

       Each of the following may be declared as a function, or  defined  as  a
       macro, or both:

       void FD_CLR(int fd, fd_set *fdset)

              Clears the bit for the file descriptor fd in the file descriptor
              set fdset.

       int FD_ISSET(int fd, fd_set *fdset)

              Returns a non-zero value if the bit for the file  descriptor  fd
              is set in the file descriptor set by fdset, and 0 otherwise.

       void FD_SET(int fd, fd_set *fdset)

              Sets  the  bit for the file descriptor fd in the file descriptor
              set fdset.

       void FD_ZERO(fd_set *fdset)

              Initializes the file descriptor set fdset to have zero bits  for
              all file descriptors.

       If  implemented as macros, these may evaluate their arguments more than
       once, so applications should ensure that the arguments they supply  are
       never expressions with side effects.

       The following shall be defined as a macro:

       FD_SETSIZE

              Maximum number of file descriptors in an fd_set structure.

       The following shall be declared as functions and may also be defined as
       macros. Function prototypes shall be provided.

              int  pselect(int, fd_set *restrict, fd_set *restrict, fd_set *restrict,
                       const struct timespec *restrict, const sigset_t *restrict);
              int  select(int, fd_set *restrict, fd_set *restrict, fd_set *restrict,
                       struct timeval *restrict);

       Inclusion of the <sys/select.h> header may  make  visible  all  symbols
       from the headers <signal.h>, <sys/time.h>, and <time.h>.

       The following sections are informative.

APPLICATION USAGE

       None.

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       <signal.h>  ,  <sys/time.h>  ,  <sys/types.h>  ,  <time.h> , the System
       Interfaces volume of IEEE Std 1003.1-2001, pselect(), select()

COPYRIGHT

       Portions of this text are reprinted and reproduced in  electronic  form
       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
       -- Portable Operating System Interface (POSIX),  The  Open  Group  Base
       Specifications  Issue  6,  Copyright  (C) 2001-2003 by the Institute of
       Electrical and Electronics Engineers, Inc and The Open  Group.  In  the
       event of any discrepancy between this version and the original IEEE and
       The Open Group Standard, the original IEEE and The Open Group  Standard
       is  the  referee document. The original Standard can be obtained online
       at http://www.opengroup.org/unix/online.html .