SYS_TIME.H(7) Miscellaneous Information Manual SYS_TIME.H(7)

sys/time.h — time types


#include <sys/time.h>

The <sys/time.h> header shall define the type and the timeval structure, as described in <sys/select.h>.

The <sys/time.h> header shall define the and suseconds_t types as described in <sys/types.h>.

The <sys/time.h> header shall define the following as described in <sys/select.h>: FD_CLR(3) FD_ISSET(3) FD_SET(3) FD_ZERO(3) FD_SETSIZE

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

int   select(int, fd_set *restrict, fd_set *restrict, fd_set *restrict,
          struct timeval *restrict);
int   utimes(const char *, const struct timeval [2]);

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

None.

The <sys/time.h> header refers to <sys/select.h> for the definition of the timeval structure, instead of the other way round, because <sys/time.h> is an optional (XSI) header whereas <sys/select.h> is mandatory.

None.

<sys/select.h>, <sys/types.h>

XSH futimens(3), pselect(3)

First released in Issue 4, Version 2.

The type of is changed from to suseconds_t.

The keyword is added to the prototypes for (), select(3), and ().

The note is added that inclusion of this header may also make symbols visible from <sys/select.h>.

The utimes(3) function is marked LEGACY.

This reference page is clarified with respect to macros and symbolic constants.

Austin Group Defect 1171 is applied, replacing the timeval structure definition with a reference to its description in <sys/select.h>.

Austin Group Defect 1330 is applied, removing obsolescent interfaces.

June 14, 2024 posix.fail