getrusage man page on Ultrix

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getrusage(2)							  getrusage(2)

Name
       getrusage - get information about resource utilization

Syntax
       #include <sys/time.h>
       #include <sys/resource.h>

       #define RUSAGE_SELF	0	  /* calling process */
       #define RUSAGE_CHILDREN	-1	  /* terminated child processes */

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

Description
       The  system  call returns information describing the resources utilized
       by the current process or all its terminated child processes.  The  who
       parameter  is  one  of  RUSAGE_SELF  and RUSAGE_CHILDREN.  If rusage is
       nonzero, the buffer it points to will be filled in with	the  following
       structure:
       struct  rusage {
	       struct timeval ru_utime;	       /* user time used */
	       struct timeval ru_stime;	       /* system time used */
	       int     ru_maxrss;
	       int     ru_ixrss;       /* integral shared text size */
	       int     ru_ismrss       /* integral shared memory size */
	       int     ru_idrss;       /* integral unshared data size */
	       int     ru_isrss;       /* integral unshared stack size */
	       int     ru_minflt;      /* page reclaims */
	       int     ru_majflt;      /* page faults */
	       int     ru_nswap;       /* swaps */
	       int     ru_inblock;     /* block input operations */
	       int     ru_oublock;     /* block output operations */
	       int     ru_msgsnd;      /* messages sent */
	       int     ru_msgrcv;      /* messages received */
	       int     ru_nsignals;    /* signals received */
	       int     ru_nvcsw;       /* voluntary context switches */
	       int     ru_nivcsw;      /* involuntary context switches */
       };

       The fields are interpreted as follows:

       ru_utime
	      The total amount of time spent executing in user mode.

       ru_stime
	      The total amount of time spent in the system executing on behalf
	      of the processes.

       ru_maxrss
	      The maximum resident set size utilized (in bytes).

       ru_ixrss
	      An “integral” value indicating the amount of  text  memory  used
	      that  was	 also  shared  among  other  processes.	 This value is
	      expressed in units of kilobytes *	 seconds-of-execution  and  is
	      calculated  by  summing the number of shared memory pages in use
	      each time the internal system clock  ticks  and  then  averaging
	      over 1-second intervals.

       ru_ismrss
	      An integral value of the amount of shared memory residing in the
	      data segment of a process (expressed in  units  of  kilobytes  *
	      seconds-of execution).

       ru_idrss
	      An  integral  value of the amount of unshared memory residing in
	      the data segment of a process (expressed in units of kilobytes *
	      seconds-of-execution).

       ru_isrss
	      An  integral  value of the amount of unshared memory residing in
	      the stack segment of a process (expressed in units of  kilobytes
	      * seconds-of-execution).

       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
	      The number of times a process was “swapped” out of main memory.

       ru_inblock
	      The number of times the file system had to perform input.

       ru_oublock
	      The number of times the file system had to perform output.

       ru_msgsnd
	      The number of ipc messages sent.

       ru_msgrcv
	      The number of ipc messages received.

       ru_nsignals
	      The number of signals delivered.

       ru_nvcsw
	      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
	      The  number  of  times a context switch resulted due to a higher
	      priority	process	 becoming  runnable  or	 because  the  current
	      process exceeded its time slice.

       The  numbers ru_inblock and ru_oublock account only for real I/O.  Data
       supplied by the cacheing mechanism is charged only to the first process
       to read or write the data.

Restrictions
       There  is  no  way to obtain information about a child process that has
       not yet terminated.

Diagnostics
       The call fails under the following conditions:

       [EINVAL]	      The who parameter is not a valid value on RUSAGE_SELF or
		      RUSAGE_CHILDREN.

       [EFAULT]	      The  address specified by the rusage parameter is not in
		      a valid part of the process address space.

See Also
       gettimeofday(2), wait(2)

								  getrusage(2)
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