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Get time-accounting information
#include <sys/times.h>
clock_t times( struct tms* buffer );
- buffer
- A pointer to a tms structure where the function can
store the time-accounting information.
For information about the tms structure, see below.
libc
Use the -l c option to
qcc
to link against this library.
This library is usually included automatically.
The times() function stores time-accounting information in the
structure pointed to by buffer. The type clock_t
and the tms structure are defined in the
<sys/times.h> header file.
The tms structure contains at least the following members:
- clock_t tms_utime
- The CPU time charged for the execution of user instructions of the
calling process.
- clock_t tms_stime
- The CPU time charged for execution by the system on behalf of the
calling process.
- clock_t tms_cutime
- The sum of the tms_utime and tms_cutime values of
the child processes.
- clock_t tms_cstime
- The sum of the tms_stime and tms_cstime values of
the child processes.
All times are in CLK_TCK'ths of a second.
CLK_TCK is defined in the <time.h> header file.
A CLK_TCK is the equivalent of:
#define sysconf( _SC_CLK_TCK )
The times of a terminated child process are included in the
tms_cutime and tms_cstime elements of the parent when a
wait()
or
waitpid()
function returns the process ID of this terminated child.
If a child process hasn't waited for its terminated children, their
times aren't included in its times.
The elapsed real time,
in clock ticks, of kernel uptime.
|
The value returned may overflow the possible range of type
clock_t. |
/*
* The following program executes the program
* specified by argv[1]. After the child program
* is finished, the cpu statistics of the child are
* printed.
*/
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/times.h>
int main( int argc, char **argv )
{
struct tms childtim;
system( argv[1] );
times( &childtim );
printf( "system time = %d\n", childtim.tms_cstime );
printf( "user time = %d\n", childtim.tms_cutime );
return EXIT_SUCCESS;
}
POSIX 1003.1
Safety: | |
Cancellation point |
No |
Interrupt handler |
No |
Signal handler |
Yes |
Thread |
Yes |
clock_gettime()
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