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Annotation of src/lib/libc/gen/times.3, Revision 1.11

1.11    ! ross        1: .\"    $NetBSD: times.3,v 1.10 2001/09/16 02:30:25 wiz Exp $
1.4       cgd         2: .\"
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1.4       cgd        34: .\"     @(#)times.3    8.1 (Berkeley) 6/4/93
1.1       cgd        35: .\"
1.4       cgd        36: .Dd June 4, 1993
1.1       cgd        37: .Dt TIMES 3
1.9       garbled    38: .Os
1.1       cgd        39: .Sh NAME
                     40: .Nm times
                     41: .Nd process times
1.6       perry      42: .Sh LIBRARY
                     43: .Lb libc
1.1       cgd        44: .Sh SYNOPSIS
1.11    ! ross       45: .Fd #include \*[Lt]sys/times.h\*[Gt]
1.10      wiz        46: .Ft clock_t
1.1       cgd        47: .Fn times "struct tms *tp"
                     48: .Sh DESCRIPTION
                     49: .Bf -symbolic
1.7       fair       50: This interface is obsoleted by
                     51: .Xr getrusage 2
                     52: and
1.8       fair       53: .Xr gettimeofday 2 .
1.1       cgd        54: .Ef
                     55: .Pp
                     56: The
                     57: .Fn times
                     58: function returns the value of time in
                     59: .Dv CLK_TCK Ns 's
                     60: of a second since
                     61: 0 hours, 0 minutes, 0 seconds, January 1, 1970, Coordinated Universal
1.8       fair       62: Time (UTC).
1.1       cgd        63: .Pp
                     64: It also fills in the structure pointed to by
                     65: .Fa tp
                     66: with time-accounting information.
                     67: .Pp
                     68: The
                     69: .Fa tms
                     70: structure is defined as follows:
                     71: .Bd -literal -offset indent
                     72: typedef struct {
                     73:        clock_t tms_utime;
                     74:        clock_t tms_stime;
                     75:        clock_t tms_cutime;
                     76:        clock_t tms_cstime;
                     77: }
                     78: .Ed
                     79: .Pp
                     80: The elements of this structure are defined as follows:
                     81: .Bl -tag -width tms_cutime
                     82: .It Fa tms_utime
                     83: The
                     84: .Tn CPU
                     85: time charged for the execution of user instructions.
                     86: .It Fa tms_stime
                     87: The
                     88: .Tn CPU
                     89: time charged for execution by the system on behalf of
                     90: the process.
                     91: .It Fa tms_cutime
                     92: The sum of the
                     93: .Fa tms_utime  s
                     94: and
                     95: .Fa tms_cutime  s
                     96: of the child processes.
                     97: .It Fa tms_cstime
                     98: The sum of the
                     99: .Fa tms_stime Ns s
                    100: and
                    101: .Fa tms_cstime Ns s
                    102: of the child processes.
                    103: .El
                    104: .Pp
                    105: All times are in
                    106: .Dv CLK_TCK Ns 's
                    107: of a second.
                    108: .Pp
                    109: The times of a terminated child process are included in the
                    110: .Fa tms_cutime
                    111: and
                    112: .Fa tms_cstime
                    113: elements of the parent when one of the
                    114: .Xr wait 2
                    115: functions returns the process ID of the terminated child to the parent.
                    116: If an error occurs,
                    117: .Fn times
                    118: returns the value
                    119: .Pq (clock_t)\-1 ,
1.10      wiz       120: and sets
1.3       jtc       121: .Va errno
                    122: to indicate the error.
1.1       cgd       123: .Sh ERRORS
                    124: The
                    125: .Fn times
                    126: function
                    127: may fail and set the global variable
                    128: .Va errno
                    129: for any of the errors specified for the library
                    130: routines
                    131: .Xr getrusage 2
                    132: and
                    133: .Xr gettimeofday 2 .
                    134: .Sh SEE ALSO
                    135: .Xr time 1 ,
                    136: .Xr getrusage 2 ,
                    137: .Xr gettimeofday 2 ,
                    138: .Xr wait 2
                    139: .Sh STANDARDS
                    140: The
                    141: .Fn times
1.5       kleink    142: function conforms to
                    143: .St -p1003.1-90 .

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