определения для операций с ресурсами XSI (definitions for XSI resource operations)
Пролог (Prolog)
This manual page is part of the POSIX Programmer's Manual. The
Linux implementation of this interface may differ (consult the
corresponding Linux manual page for details of Linux behavior),
or the interface may not be implemented on Linux.
Имя (Name)
sys/resource.h — definitions for XSI resource operations
Синопсис (Synopsis)
#include <sys/resource.h>
Описание (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 <sys/resource.h> header shall define the following type
through typedef:
rlim_t Unsigned integer type used for limit values.
The <sys/resource.h> header shall define the following symbolic
constants, which shall have values suitable for use in #if
preprocessing directives:
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 <sys/resource.h> header shall define the following symbolic
constants 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,
which shall include 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,
which shall include at least the following members:
struct timeval ru_utime User time used.
struct timeval ru_stime System time used.
The <sys/resource.h> header shall define the timeval structure as
described in <sys/time.h>.
The <sys/resource.h> header shall define the following symbolic
constants 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 <sys/resource.h> header shall define the id_t type 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.
Использование в приложениях (Application usage)
None.
Обоснование (Rationale)
None.
Будущие направления (Future directions)
None.
Смотри также (See also)
sys_time.h(0p), sys_types.h(0p)
The System Interfaces volume of POSIX.1‐2017, getpriority(3p),
getrlimit(3p), getrusage(3p)
