This manual page is part of the POSIX Programmer's Manual. The Linux
implementation of this interface may differ (consult the corresponding Linux
manual page for details of Linux behavior), or the interface may not be
implemented on Linux.
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
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:
- 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
exit(), sigaction(), time(),
int who = RUSAGE_SELF;
struct rusage usage;
ret = getrusage(who, &usage);
The Base Definitions volume of POSIX.1‐2017,
Portions of this text are reprinted and reproduced in electronic form from IEEE
Std 1003.1-2017, Standard for Information Technology -- Portable Operating
System Interface (POSIX), The Open Group Base Specifications Issue 7, 2018
Edition, Copyright (C) 2018 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 .
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