getrlimit man page on NeXTSTEP

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GETRLIMIT(2)							  GETRLIMIT(2)

NAME
       getrlimit, setrlimit - control maximum system resource consumption

SYNOPSIS
       #include <sys/time.h>
       #include <sys/resource.h>

       getrlimit(resource, rlp)
       int resource;
       struct rlimit *rlp;

       setrlimit(resource, rlp)
       int resource;
       struct rlimit *rlp;

DESCRIPTION
       Limits  on  the	consumption of system resources by the current process
       and each process it creates may be obtained with	 the  getrlimit	 call,
       and set with the setrlimit call.

       The resource parameter is one of the following:

       RLIMIT_CPU	the maximum amount of cpu time (in seconds) to be used
			by each process.

       RLIMIT_FSIZE	the largest size, in bytes, of any  single  file  that
			may be created.

       RLIMIT_DATA	the  maximum size, in bytes, of the data segment for a
			process; this defines how far a program may extend its
			break with the sbrk(2) system call.

       RLIMIT_STACK	the maximum size, in bytes, of the stack segment for a
			process;  this	defines	 how  far  a  program's	 stack
			segment may be extended.

       RLIMIT_CORE	the largest size, in bytes, of a core file that may be
			created.

       RLIMIT_RSS	the maximum size,  in  bytes,  to  which  a  process's
			resident  set  size may grow.  This imposes a limit on
			the amount  of	physical  memory  to  be  given	 to  a
			process; if memory is tight, the system will prefer to
			take memory from processes that	 are  exceeding	 their
			declared resident set size.

       A resource limit is specified as a soft limit and a hard limit.	When a
       soft limit is exceeded a process may receive a signal (for example,  if
       the cpu time is exceeded), but it will be allowed to continue execution
       until it reaches the hard limit (or modifies its resource limit).   The
       rlimit  structure  is  used  to	specify	 the hard and soft limits on a
       resource,

	      struct rlimit {
		   int	rlim_cur; /* current (soft) limit */
		   int	rlim_max; /* hard limit */
	      };

       Only the super-user may raise the maximum limits.  Other users may only
       alter  rlim_cur	within	the range from 0 to rlim_max or (irreversibly)
       lower rlim_max.

       An  “infinite”  value  for  a  limit  is	  defined   as	 RLIM_INFINITY
       (0x7fffffff).

       Because this information is stored in the per-process information, this
       system call must be executed directly by the shell if it is  to	affect
       all  future  processes  created	by the shell; limit is thus a built-in
       command to csh(1).

       The system refuses to extend the data or stack space  when  the	limits
       would  be  exceeded  in	the normal way: a break call fails if the data
       space limit is reached.	When the stack limit is reached,  the  process
       receives	 a  segmentation fault (SIGSEGV); if this signal is not caught
       by a handler using the signal stack, this signal will kill the process.

       A file I/O operation that would create a file that is  too  large  will
       cause  a	 signal	 SIGXFSZ to be generated; this normally terminates the
       process, but may be caught.  When the soft cpu time limit is  exceeded,
       a signal SIGXCPU is sent to the offending process.

RETURN VALUE
       A  0  return  value  indicates  that  the  call	succeeded, changing or
       returning the resource limit.   A return value of -1 indicates that  an
       error  occurred,	 and  an  error	 code is stored in the global location
       errno.

ERRORS
       The possible errors are:

       [EFAULT]	      The address specified for rlp is invalid.

       [EPERM]	 The limit specified to setrlimit would have
		      raised the maximum limit value, and the  caller  is  not
		      the super-user.

SEE ALSO
       csh(1), sigvec(2), sigstack(2)

BUGS
       There should be limit and unlimit commands in sh(1) as well as in csh.

4th Berkeley Distribution	 May 13, 1986			  GETRLIMIT(2)
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