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

       The Base Definitions volume of POSIX.1‐2017, <sys_resource.h>

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 .