getrusage (3p) - Linux Manuals

getrusage: get information about resource utilization

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.

NAME

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);

APPLICATION USAGE

None.

RATIONALE

None.

FUTURE DIRECTIONS

None.

COPYRIGHT

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 original Standard can be obtained online at http://www.opengroup.org/unix/online.html .