GETRUSAGE(P) POSIX Programmer's Manual GETRUSAGE(P)
getrusage - get information about resource utilization
int getrusage(int who, struct rusage *r_usage);
The getrusage() function shall provide 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 shall be returned about resources used by the current process.
If the value of the who argument is RUSAGE_CHILDREN, information shall be returned about
resources used by the terminated and waited-for children of the current process. If the
child is never waited for (for example, 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.
Upon successful completion, getrusage() shall return 0; otherwise, -1 shall be returned
and errno set to indicate the error.
The getrusage() function shall fail if:
EINVAL The value of the who argument is not valid.
The following sections are informative.
The following example returns information about the resources used by the current process.
int who = RUSAGE_SELF;
struct rusage usage;
ret = getrusage(who, &usage);
exit() , sigaction() , time() , times() , wait() , the Base Definitions volume of
IEEE Std 1003.1-2001, <sys/resource.h>
Portions of this text are reprinted and reproduced in electronic form from IEEE Std
1003.1, 2003 Edition, Standard for Information Technology -- Portable Operating System
Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 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 orig-
inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .
IEEE/The Open Group 2003 GETRUSAGE(P)