выбрать типы (select types)
Пролог (Prolog)
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.
Имя (Name)
sys/select.h — select types
Синопсис (Synopsis)
#include <sys/select.h>
Описание (Description)
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.
Использование в приложениях (Application usage)
None.
Обоснование (Rationale)
None.
Будущие направления (Future directions)
None.
Смотри также (See also)
signal.h(0p), sys_time.h(0p), sys_types.h(0p), time.h(0p)
The System Interfaces volume of POSIX.1‐2017, pselect(3p)
