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PROLOG | NAME | SYNOPSIS | DESCRIPTION | APPLICATION USAGE | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT |
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sys_resource.h(0P) POSIX Programmer's Manual sys_resource.h(0P)
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.
sys/resource.h — definitions for XSI resource operations
#include <sys/resource.h>
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.
None.
None.
None.
sys_time.h(0p), sys_types.h(0p)
The System Interfaces volume of POSIX.1‐2017, getpriority(3p),
getrlimit(3p), getrusage(3p)
Portions of this text are reprinted and reproduced in electronic
form from IEEE Std 1003.1-2017, Standard for Information
Technology -- Portable Operating System Interface (POSIX), The
Open Group Base Specifications Issue 7, 2018 Edition, Copyright
(C) 2018 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 .
Any typographical or formatting errors that appear in this page
are most likely to have been introduced during the conversion of
the source files to man page format. To report such errors, see
https://www.kernel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group 2017 sys_resource.h(0P)
Pages that refer to this page: sys_wait.h(0p), getpriority(3p), getrlimit(3p), getrusage(3p)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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