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    The following form allows you to view linux man pages.

    Command:

    getrusage

    
    
    

    SYNOPSIS

           #include <sys/time.h>
           #include <sys/resource.h>
    
           int getrusage(int who, struct rusage *usage);
    
    
    

    DESCRIPTION

           getrusage()  returns  resource usage measures for who, which can be one
           of the following:
    
           RUSAGE_SELF
                  Return resource usage statistics for the calling process,  which
                  is the sum of resources used by all threads in the process.
    
           RUSAGE_CHILDREN
                  Return resource usage statistics for all children of the calling
                  process that have terminated and been waited for.  These statis-
                  tics  will include the resources used by grandchildren, and fur-
                  ther removed descendants, if all of the intervening  descendants
                  waited on their terminated children.
    
           RUSAGE_THREAD (since Linux 2.6.26)
                  Return resource usage statistics for the calling thread.
    
           The  resource usages are returned in the structure pointed to by usage,
           which has the following form:
    
               struct rusage {
                   struct timeval ru_utime; /* user CPU time used */
                   struct timeval ru_stime; /* system CPU time used */
                   long   ru_maxrss;        /* maximum resident set size */
                   long   ru_ixrss;         /* integral shared memory size */
                   long   ru_idrss;         /* integral unshared data size */
                   long   ru_isrss;         /* integral unshared stack size */
                   long   ru_minflt;        /* page reclaims (soft page faults) */
                   long   ru_majflt;        /* page faults (hard page faults) */
                   long   ru_nswap;         /* swaps */
                   long   ru_inblock;       /* block input operations */
                   long   ru_oublock;       /* block output operations */
                   long   ru_msgsnd;        /* IPC messages sent */
                   long   ru_msgrcv;        /* IPC messages received */
                   long   ru_nsignals;      /* signals received */
                   long   ru_nvcsw;         /* voluntary context switches */
                   long   ru_nivcsw;        /* involuntary context switches */
               };
    
           Not all fields are completed; unmaintained fields are set  to  zero  by
           the  kernel.   (The  unmaintained fields are provided for compatibility
           with other systems, and because  they  may  one  day  be  supported  on
           Linux.)  The fields are interpreted as follows:
    
           ru_utime
    
           ru_idrss (unmaintained)
                  This field is currently unused on Linux.
    
           ru_isrss (unmaintained)
                  This field is currently unused on Linux.
    
           ru_minflt
                  The  number  of  page  faults serviced without any I/O activity;
                  here I/O activity is avoided by "reclaiming" a page  frame  from
                  the list of pages awaiting reallocation.
    
           ru_majflt
                  The number of page faults serviced that required I/O activity.
    
           ru_nswap (unmaintained)
                  This field is currently unused on Linux.
    
           ru_inblock (since Linux 2.6.22)
                  The number of times the filesystem had to perform input.
    
           ru_oublock (since Linux 2.6.22)
                  The number of times the filesystem had to perform output.
    
           ru_msgsnd (unmaintained)
                  This field is currently unused on Linux.
    
           ru_msgrcv (unmaintained)
                  This field is currently unused on Linux.
    
           ru_nsignals (unmaintained)
                  This field is currently unused on Linux.
    
           ru_nvcsw (since Linux 2.6)
                  The  number  of times a context switch resulted due to a process
                  voluntarily giving up the processor before its  time  slice  was
                  completed (usually to await availability of a resource).
    
           ru_nivcsw (since Linux 2.6)
                  The  number  of  times a context switch resulted due to a higher
                  priority process becoming runnable or because the  current  pro-
                  cess exceeded its time slice.
    
    
    

    RETURN VALUE

           On  success,  zero is returned.  On error, -1 is returned, and errno is
           set appropriately.
    
    
    

    ERRORS

           EFAULT usage points outside the accessible address space.
    
           EINVAL who is invalid.
           set to SIG_IGN then the resource usages of child processes are automat-
           ically included in the  value  returned  by  RUSAGE_CHILDREN,  although
           POSIX.1-2001  explicitly prohibits this.  This nonconformance is recti-
           fied in Linux 2.6.9 and later.
    
           The structure definition shown at the start of this page was taken from
           4.3BSD Reno.
    
           Ancient  systems provided a vtimes() function with a similar purpose to
           getrusage().  For backward compatibility, glibc also provides vtimes().
           All new applications should be written using getrusage().
    
           See also the description of /proc/PID/stat in proc(5).
    
    
    

    SEE ALSO

           clock_gettime(2), getrlimit(2), times(2), wait(2), wait4(2), clock(3)
    
    
    

    Linux 2010-09-26 GETRUSAGE(2)

    
    
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