getrusage man page

Prolog

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

Synopsis

#include <sys/resource.h>

int getrusage(int who, struct rusage *r_usage);

Description

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.

Return Value

Upon successful completion, getrusage() shall return 0; otherwise, -1 shall be returned and errno set to indicate the error.

Errors

The getrusage() function shall fail if:

EINVAL
The value of the who argument is not valid.

The following sections are informative.

Examples

Using getrusage()

The following example returns information about the resources used by the current process.

#include <sys/resource.h>
...
int who = RUSAGE_SELF;
struct rusage usage;
int ret;

ret = getrusage(who, &usage);

See Also

exit(), sigaction(), time(), times(), wait()

The Base Definitions volume of POSIX.1‐2008, <sys_resource.h>

Info

2013 IEEE/The Open Group POSIX Programmer's Manual