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PROLOG | NAME | SYNOPSIS | DESCRIPTION | APPLICATION USAGE | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT |
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sys_time.h(0P) POSIX Programmer's Manual sys_time.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/time.h — time types
#include <sys/time.h>
The <sys/time.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/time.h> header shall define the itimerval structure,
which shall include at least the following members:
struct timeval it_interval Timer interval.
struct timeval it_value Current value.
The <sys/time.h> header shall define the time_t and suseconds_t
types as described in <sys/types.h>.
The <sys/time.h> header shall define the fd_set type as described
in <sys/select.h>.
The <sys/time.h> header shall define the following symbolic
constants for the which argument of getitimer() and setitimer():
ITIMER_REAL Decrements in real time.
ITIMER_VIRTUAL
Decrements in process virtual time.
ITIMER_PROF Decrements both in process virtual time and when
the system is running on behalf of the process.
The <sys/time.h> header shall define the following as described
in <sys/select.h>: FD_CLR() FD_ISSET() FD_SET() FD_ZERO()
FD_SETSIZE
The following shall be declared as functions and may also be
defined as macros. Function prototypes shall be provided.
int getitimer(int, struct itimerval *);
int gettimeofday(struct timeval *restrict, void *restrict);
int setitimer(int, const struct itimerval *restrict,
struct itimerval *restrict);
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.
The following sections are informative.
None.
None.
None.
sys_select.h(0p), sys_types.h(0p)
The System Interfaces volume of POSIX.1‐2017, futimens(3p),
getitimer(3p), gettimeofday(3p), 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_time.h(0P)
Pages that refer to this page: sys_resource.h(0p), sys_select.h(0p), utmpx.h(0p), futimens(3p), getitimer(3p), gettimeofday(3p), pselect(3p)
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HTML rendering created 2024-06-26 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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