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 pro-
cesses. 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 Technol-
ogy -- 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 original Standard can be obtained
online at http://www.opengroup.org/unix/online.html .
IEEE/The Open Group 2003 GETRUSAGE(P)