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man pages section 3: Library Interfaces and Headers

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Updated: Thursday, June 13, 2019
 
 

resource.h(3HEAD)

Name

resource.h, resource - definitions for resource operations

Synopsis

#include <sys/resource.h> 

Description

The <sys/resource.h> header defines the symbolic constants listed below as possible values of the which argument of getpriority() and setpriority(). See getpriority(3C).

PRIO_PROCESS

identifies the who argument as a process ID

PRIO_PGRP

identifies the who argument as a process group ID

PRIO_USER

identifies the who argument as a user ID

The following type is defined through typedef:

rlim_t

unsigned integer type used for limit values

The following symbolic constants are defined:

RLIM_INFINITY

a value of rlim_t indicating no limit

RLIM_SAVED_MAX

a value of type rlim_t indicating an unrepresentable saved hard limit

RLIM_SAVED_CUR

a value of type rlim_t indicating an unrepresentable saved soft limit

The symbolic constants listed below are defined as possible values of the who parameter of getrusage(). See getrusage(3C).

RUSAGE_SELF

returns information about the current process

RUSAGE_CHILDREN

returns information about children of the current process

The <sys/resource.h> header defines the rlimit structure, which includes the following members:

rlim_t rlim_cur     /* the current (soft) limit */
rlim_t rlim_max     /* the hard limit */

The <sys/resource.h> header defines the rusage structure, which includes the following members:


struct timeval ru_utime     /* user time used */
struct timeval ru_stime     /* system time used */

The timeval structure is defined as described in <sys/time.h>.

The symbolic constants listed below are defined as possible values for the resource argument of getrlimit() and setrlimit(). See getrlimit(2).

RLIMIT_CORE

limit on size of core dump file

RLIMIT_CPU

limit on CPU time per process

RLIMIT_DATA

limit on data segment size

RLIMIT_FSIZE

limit on file size

RLIMIT_NOFILE

limit on number of open files

RLIMIT_STACK

limit on stack size

RLIMIT_AS

limit on address space size

The id_t type is defined through typedef as described in <sys/types.h>. See types.h(3HEAD).

Inclusion of the <sys/resource.h> header can also make visible all symbols from <sys/time.h>. See time.h(3HEAD).

Attributes

See attributes(7) for descriptions of the following attributes:

ATTRIBUTE TYPE
ATTRIBUTE VALUE
Interface Stability
Committed
Standard

See Also

getrlimit(2), getpriority(3C), time.h(3HEAD), types.h(3HEAD), attributes(7), standards(7)