getrusage(2)

DESCRIPTION

The getrusage() function provides measures of the resources used by the current process or its terminated and waited-for child processes. If the value of the who argument is RUSAGE_SELF, information is returned about resources used by the current process. If the value of the who argument is RUSAGE_CHILDREN, information is returned about resources used by the terminated and waited-for children of the current process. If the child is never waited for (for instance, if the parent has SA_NOCLDWAIT set or sets SIGCHLD to SIG_IGN), the resource information for the child process is discarded and not included in the resource information provided by getrusage(). The r_usage argument is a pointer to an object of type struct rusage in which the returned information is stored.

If the current process is multi-threaded, getrusage() returns the information about the resources used by all the active and the reaped threads/light-weight processes in the current process if the value of the who argument is RUSAGE_SELF. If the value of the who argument is RUSAGE_CHILDREN in a multi-threaded process, information returned is the same as it would be for a single-threaded process.

RETURN VALUE

Upon successful completion, getrusage() returns 0. Otherwise, -1 is returned, and errno is set to indicate the error.

ERRORS

The getrusage() function will fail if:

SEE ALSO

exit(2), sigaction(2), time(1), times(2), wait(1), <sys/resource.h>.