resource.h(3HEAD) Headers 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 set-
priority(). 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 getr-
limit(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(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Interface Stability |Standard |
+-----------------------------+-----------------------------+
SEE ALSO getrlimit(2), getpriority(3C), time.h(3HEAD), types.h(3HEAD), attributes(5), standards(5)SunOS 5.10 10 Sep 2004 resource.h(3HEAD)
Check Out this Related Man Page
<sys/resource.h>(P) POSIX Programmer's Manual <sys/resource.h>(P)
NAME
sys/resource.h - definitions for XSI resource operations
SYNOPSIS
#include <sys/resource.h>
DESCRIPTION
The <sys/resource.h> header shall define the following symbolic constants as possible values of the which argument of getpriority() and
setpriority():
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 shall be defined through typedef:
rlim_t Unsigned integer type used for limit values.
The following symbolic constants shall be 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.
On implementations where all resource limits are representable in an object of type rlim_t, RLIM_SAVED_MAX and RLIM_SAVED_CUR need not be
distinct from RLIM_INFINITY.
The following symbolic constants shall be defined as possible values of the who parameter of getrusage():
RUSAGE_SELF
Returns information about the current process.
RUSAGE_CHILDREN
Returns information about children of the current process.
The <sys/resource.h> header shall define the rlimit structure that includes at least the following members:
rlim_t rlim_cur The current (soft) limit.
rlim_t rlim_max The hard limit.
The <sys/resource.h> header shall define the rusage structure that includes at least the following members:
struct timeval ru_utime User time used.
struct timeval ru_stime System time used.
The timeval structure shall be defined as described in <sys/time.h> .
The following symbolic constants shall be defined as possible values for the resource argument of getrlimit() and setrlimit():
RLIMIT_CORE
Limit on size of core 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 following shall be declared as functions and may also be defined as macros. Function prototypes shall be provided.
int getpriority(int, id_t);
int getrlimit(int, struct rlimit *);
int getrusage(int, struct rusage *);
int setpriority(int, id_t, int);
int setrlimit(int, const struct rlimit *);
The id_t type shall be defined through typedef as described in <sys/types.h> .
Inclusion of the <sys/resource.h> header may also make visible all symbols from <sys/time.h>.
The following sections are informative.
APPLICATION USAGE
None.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
<sys/time.h> , <sys/types.h> , the System Interfaces volume of IEEE Std 1003.1-2001, getpriority(), getrusage(), getrlimit()
COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol-
ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE
and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained
online at http://www.opengroup.org/unix/online.html .
IEEE /The Open Group 2003 <sys/resource.h>(P)