gen/FreeBSD/times.3

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  28 .\"     @(#)times.3     8.1 (Berkeley) 6/4/93
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  31 .Dd December 1, 2008
  32 .Dt TIMES 3
  33 .Os
  34 .Sh NAME
  35 .Nm times
  36 .Nd process times
  37 .Sh LIBRARY
  38 .Lb libc
  39 .Sh SYNOPSIS
  40 .In sys/times.h
  41 .Ft clock_t
  42 .Fn times "struct tms *tp"
  43 .Sh DESCRIPTION
  44 .Bf -symbolic
  45 This interface is obsoleted by
  46 .Xr getrusage 2
  47 and
  48 .Xr gettimeofday 2 .
  49 .Ef
  50 .Pp
  51 The
  52 .Fn times
  53 function returns the value of time in
  54 .Dv CLK_TCK Ns 's
  55 of a second since
  56 0 hours, 0 minutes, 0 seconds, January 1, 1970, Coordinated Universal
  57 Time.
  58 .Pp
  59 It also fills in the structure pointed to by
  60 .Fa tp
  61 with time-accounting information.
  62 .Pp
  63 The
  64 .Vt tms
  65 structure is defined as follows:
  66 .Bd -literal -offset indent
  67 struct tms {
  68         clock_t tms_utime;
  69         clock_t tms_stime;
  70         clock_t tms_cutime;
  71         clock_t tms_cstime;
  72 };
  73 .Ed
  74 .Pp
  75 The elements of this structure are defined as follows:
  76 .Bl -tag -width ".Va tms_cutime"
  77 .It Va tms_utime
  78 The
  79 .Tn CPU
  80 time charged for the execution of user instructions.
  81 .It Va tms_stime
  82 The
  83 .Tn CPU
  84 time charged for execution by the system on behalf of
  85 the process.
  86 .It Va tms_cutime
  87 The sum of the
  88 .Va tms_utime Ns s
  89 and
  90 .Va tms_cutime Ns s
  91 of the child processes.
  92 .It Va tms_cstime
  93 The sum of the
  94 .Fa tms_stime Ns s
  95 and
  96 .Fa tms_cstime Ns s
  97 of the child processes.
  98 .El
  99 .Pp
 100 All times are in
 101 .Dv CLK_TCK Ns 's
 102 of a second.
 103 .Pp
 104 The times of a terminated child process are included in the
 105 .Va tms_cutime
 106 and
 107 .Va tms_cstime
 108 elements of the parent when one of the
 109 .Xr wait 2
 110 functions returns the process ID of the terminated child to the parent.
 111 If an error occurs,
 112 .Fn times
 113 returns the value
 114 .Pq Po Vt clock_t Pc Ns \-1 ,
 115 and sets
 116 .Va errno
 117 to indicate the error.
 118 .Sh ERRORS
 119 The
 120 .Fn times
 121 function
 122 may fail and set the global variable
 123 .Va errno
 124 for any of the errors specified for the library
 125 routines
 126 .Xr getrusage 2
 127 and
 128 .Xr gettimeofday 2 .
 129 .Sh SEE ALSO
 130 .Xr time 1 ,
 131 .Xr getrusage 2 ,
 132 .Xr gettimeofday 2 ,
 133 .Xr wait 2
 134 .Sh STANDARDS
 135 The
 136 .Fn times
 137 function
 138 conforms to
 139 .St -p1003.1-88 .