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TIMES(2) Linux Programmer's Manual TIMES(2)
NAME
times - get process times
SYNOPSIS
#include <sys/times.h>
clock_t times(struct tms *buf);
DESCRIPTION
times() stores the current process times in the struct tms that buf
points to. The struct tms is as defined in <sys/times.h>:
struct tms {
clock_t tms_utime; /* user time */
clock_t tms_stime; /* system time */
clock_t tms_cutime; /* user time of children */
clock_t tms_cstime; /* system time of children */
};
The tms_utime field contains the CPU time spent executing instructions
of the calling process. The tms_stime field contains the CPU time
spent in the system while executing tasks on behalf of the calling pro-
cess. The tms_cutime field contains the sum of the tms_utime and
tms_cutime values for all waited-for terminated children. The
tms_cstime field contains the sum of the tms_stime and tms_cstime val-
ues for all waited-for terminated children.
Times for terminated children (and their descendants) is added in at
the moment wait(2) or waitpid(2) returns their process ID. In particu-
lar, times of grandchildren that the children did not wait for are
never seen.
All times reported are in clock ticks.
RETURN VALUE
times() returns the number of clock ticks that have elapsed since an
arbitrary point in the past. For Linux 2.4 and earlier this point is
the moment the system was booted. Since Linux 2.6, this point is
(2^32/HZ) - 300 (i.e., about 429 million) seconds before system boot
time. The return value may overflow the possible range of type
clock_t. On error, (clock_t) -1 is returned, and errno is set appro-
priately.
NOTES
The number of clock ticks per second can be obtained using
sysconf(_SC_CLK_TCK);
In POSIX-1996 the symbol CLK_TCK (defined in <time.h>) is mentioned as
obsolescent. It is obsolete now.
In Linux kernel versions before 2.6.9, if the disposition of SIGCHLD is
set to SIG_IGN then the times of terminated children are automatically
included in the tms_cstime and tms_cutime fields, although POSIX.1-2001
says that this should only happen if the calling process wait()s on its
children. This non-conformance is rectified in Linux 2.6.9 and later.
On Linux, the buf argument can be specified as NULL, with the result
that times() just returns a function result. However, POSIX does not
specify this behaviour, and most other Unix implementations require a
non-NULL value for buf.
Note that clock(3) returns values of type clock_t that are not measured
in clock ticks but in CLOCKS_PER_SEC.
CONFORMING TO
SVr4, 4.3BSD, POSIX.1-2001.
HISTORICAL NOTES
SVr1-3 returns long and the struct members are of type time_t although
they store clock ticks, not seconds since the epoch. V7 used long for
the struct members, because it had no type time_t yet.
On older systems the number of clock ticks per second is given by the
variable HZ.
SEE ALSO
time(1), getrusage(2), wait(2), clock(3), sysconf(3), time(7)
Linux 2002-06-14 TIMES(2)
Man(1) output converted with
man2html and wrapped by fishsponge
This page was generated on Sat Sep 8 16:35:42 GMT 2007
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