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.TH RESOURCE.H 3HEAD "Sep 10, 2004"
.SH NAME
resource.h, resource \- definitions for resource operations
.SH SYNOPSIS
.LP
.nf
#include <\fBsys/resource.h\fR>
.fi

.SH DESCRIPTION
.sp
.LP
The <\fBsys/resource.h\fR> header defines the symbolic constants listed below
as possible values of the \fIwhich\fR argument of \fBgetpriority()\fR and
\fBsetpriority()\fR. See \fBgetpriority\fR(3C).
.sp
.ne 2
.na
\fB\fBPRIO_PROCESS\fR\fR
.ad
.RS 16n
identifies the \fIwho\fR argument as a process ID
.RE

.sp
.ne 2
.na
\fB\fBPRIO_PGRP\fR\fR
.ad
.RS 16n
identifies the \fIwho\fR argument as a process group ID
.RE

.sp
.ne 2
.na
\fB\fBPRIO_USER\fR\fR
.ad
.RS 16n
identifies the \fIwho\fR argument as a user  ID
.RE

.sp
.LP
The following type is defined through \fBtypedef\fR:
.sp
.ne 2
.na
\fB\fBrlim_t\fR\fR
.ad
.RS 10n
unsigned integer type used for limit values
.RE

.sp
.LP
The following symbolic constants are defined:
.sp
.ne 2
.na
\fB\fBRLIM_INFINITY\fR\fR
.ad
.RS 18n
a value of \fBrlim_t\fR indicating no limit
.RE

.sp
.ne 2
.na
\fB\fBRLIM_SAVED_MAX\fR\fR
.ad
.RS 18n
a value of type \fBrlim_t\fR indicating an unrepresentable saved hard limit
.RE

.sp
.ne 2
.na
\fB\fBRLIM_SAVED_CUR\fR\fR
.ad
.RS 18n
a value of type \fBrlim_t\fR indicating an unrepresentable saved soft limit
.RE

.sp
.LP
The symbolic constants listed below are defined as possible values of the
\fIwho\fR parameter of \fBgetrusage()\fR. See \fBgetrusage\fR(3C).
.sp
.ne 2
.na
\fB\fBRUSAGE_SELF\fR\fR
.ad
.RS 19n
returns information about the current process
.RE

.sp
.ne 2
.na
\fB\fBRUSAGE_CHILDREN\fR\fR
.ad
.RS 19n
returns information about children of the current process
.RE

.sp
.LP
The <\fBsys/resource.h\fR> header defines the \fBrlimit\fR structure, which
includes  the following members:
.sp
.in +2
.nf
rlim_t rlim_cur     /* the current (soft) limit */
rlim_t rlim_max     /* the hard limit */
.fi
.in -2

.sp
.LP
The <\fBsys/resource.h\fR> header defines the \fBrusage\fR structure, which
includes the following members:
.sp
.in +2
.nf
struct timeval ru_utime     /* user time used */
struct timeval ru_stime     /* system time used */
.fi
.in -2

.sp
.LP
The \fBtimeval\fR structure is defined as described in <\fBsys/time.h\fR>.
.sp
.LP
The symbolic constants listed below are defined as possible values for the
\fIresource\fR argument of \fBgetrlimit()\fR and \fBsetrlimit()\fR. See
\fBgetrlimit\fR(2).
.sp
.ne 2
.na
\fB\fBRLIMIT_CORE\fR\fR
.ad
.RS 17n
limit on size of core dump file
.RE

.sp
.ne 2
.na
\fB\fBRLIMIT_CPU\fR\fR
.ad
.RS 17n
limit on CPU time per process
.RE

.sp
.ne 2
.na
\fB\fBRLIMIT_DATA\fR\fR
.ad
.RS 17n
limit on data segment size
.RE

.sp
.ne 2
.na
\fB\fBRLIMIT_FSIZE\fR\fR
.ad
.RS 17n
limit on file size
.RE

.sp
.ne 2
.na
\fB\fBRLIMIT_NOFILE\fR\fR
.ad
.RS 17n
limit on number of open files
.RE

.sp
.ne 2
.na
\fB\fBRLIMIT_STACK\fR\fR
.ad
.RS 17n
limit on stack size
.RE

.sp
.ne 2
.na
\fB\fBRLIMIT_AS\fR\fR
.ad
.RS 17n
limit on address space size
.RE

.sp
.LP
The \fBid_t\fR type is defined through \fBtypedef\fR as described in
<\fBsys/types.h\fR>. See \fBtypes.h\fR(3HEAD).
.sp
.LP
Inclusion of the <\fBsys/resource.h\fR> header can also make visible all
symbols from <\fBsys/time.h\fR>. See \fBtime.h\fR(3HEAD).
.SH ATTRIBUTES
.sp
.LP
See \fBattributes\fR(5) for descriptions of the following attributes:
.sp

.sp
.TS
box;
c | c
l | l .
ATTRIBUTE TYPE	ATTRIBUTE VALUE
_
Interface Stability	Standard
.TE

.SH SEE ALSO
.sp
.LP
\fBgetrlimit\fR(2), \fBgetpriority\fR(3C), \fBtime.h\fR(3HEAD),
\fBtypes.h\fR(3HEAD), \fBattributes\fR(5), \fBstandards\fR(5)