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PROLOG | NAME | SYNOPSIS | DESCRIPTION | APPLICATION USAGE | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT |
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sys_select.h(0P) POSIX Programmer's Manual sys_select.h(0P)
This manual page is part of the POSIX Programmer's Manual. The
Linux implementation of this interface may differ (consult the
corresponding Linux manual page for details of Linux behavior), or
the interface may not be implemented on Linux.
sys/select.h — select types
#include <sys/select.h>
The <sys/select.h> header shall define the timeval structure,
which shall include at least the following members:
time_t tv_sec Seconds.
suseconds_t tv_usec Microseconds.
The <sys/select.h> header shall define the time_t and suseconds_t
types as described in <sys/types.h>.
The <sys/select.h> header shall define the sigset_t type as
described in <signal.h>.
The <sys/select.h> header shall define the timespec structure as
described in <time.h>.
The <sys/select.h> header shall define the fd_set type as a
structure.
The <sys/select.h> header shall define the following symbolic
constant, which shall have a value suitable for use in #if
preprocessing directives:
FD_SETSIZE Maximum number of file descriptors in an fd_set
structure.
The following shall be declared as functions, defined as macros,
or both. If functions are declared, function prototypes shall be
provided.
void FD_CLR(int, fd_set *);
int FD_ISSET(int, fd_set *);
void FD_SET(int, fd_set *);
void FD_ZERO(fd_set *);
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 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> and <time.h>.
The following sections are informative.
None.
None.
None.
signal.h(0p), sys_time.h(0p), sys_types.h(0p), time.h(0p)
The System Interfaces volume of POSIX.1‐2017, pselect(3p)
Portions of this text are reprinted and reproduced in electronic
form from IEEE Std 1003.1-2017, Standard for Information
Technology -- Portable Operating System Interface (POSIX), The
Open Group Base Specifications Issue 7, 2018 Edition, Copyright
(C) 2018 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 .
Any typographical or formatting errors that appear in this page
are most likely to have been introduced during the conversion of
the source files to man page format. To report such errors, see
https://www.kernel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group 2017 sys_select.h(0P)
Pages that refer to this page: sys_time.h(0p), pselect(3p)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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