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System Calls times(2)
NAME
times - get process and child process times
SYNOPSIS
#include <sys/times.h>
#include <limits.h>
clock_t times(struct tms *buffer);
DESCRIPTION
The times() function fills the tms structure pointed to by
buffer with time-accounting information. The tms structure,
defined in <sys/times.h>, contains the following members:
clock_t tms_utime;
clock_t tms_stime;
clock_t tms_cutime;
clock_t tms_cstime;
All times are reported in clock ticks. The specific value
for a clock tick is defined by the variable CLK_TCK, found
in the header <limits.h>.
The times of a terminated child process are included in the
tms_cutime and tms_cstime members of the parent when
wait(3C) or waitpid(3C) returns the process ID of this ter-
minated child. If a child process has not waited for its
children, their times will not be included in its times.
The tms_utime member is the CPU time used while executing
instructions in the user space of the calling process.
The tms_stime member is the CPU time used by the system on
behalf of the calling process.
The tms_cutime member is the sum of the tms_utime and the
tms_cutime of the child processes.
The tms_cstime member is the sum of the tms_stime and the
tms_cstime of the child processes.
RETURN VALUES
Upon successful completion, times() returns the elapsed real
time, in clock ticks, since an arbitrary point in the past
(for example, system start-up time). This point does not
change from one invocation of times() within the process to
another. The return value may overflow the possible range of
type clock_t. If times() fails, (clock_t)-1 is returned and
errno is set to indicate the error.
SunOS 5.10 Last change: 14 May 1997 1
System Calls times(2)
ERRORS
The times() function will fail if:
EFAULT The buffer argument points to an illegal
address.
ATTRIBUTES
See attributes(5) for descriptions of the following attri-
butes:
____________________________________________________________
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
|_____________________________|_____________________________|
| Interface Stability | Standard |
|_____________________________|_____________________________|
| MT-Level | Async-Signal-Safe |
|_____________________________|_____________________________|
SEE ALSO
time(1), timex(1), exec(2), fork(2), time(2), waitid(2),
wait(3C), waitpid(3C), attributes(5), standards(5)
SunOS 5.10 Last change: 14 May 1997 2
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This page was generated on Wed Sep 12 11:27:11 GMT 2007
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