getrusage(3p) — Linux manual page

GETRUSAGE(3P)           POSIX Programmer's Manual          GETRUSAGE(3P)

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.

SEE ALSO

       exit(3p), sigaction(3p), time(3p), times(3p), wait(3p)

       The Base Definitions volume of POSIX.1‐2017, sys_resource.h(0p)

COPYRIGHT

       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 .

       Any typographical or formatting errors that appear in this page
       are most likely to have been introduced during the conversion of
       the source files to man page format. To report such errors, see
       https://www.kernel.org/doc/man-pages/reporting_bugs.html .

IEEE/The Open Group               2017                     GETRUSAGE(3P)

Pages that refer to this page: sys_resource.h(0p)

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