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OpenSolaris 2009.06 - man page for ulimit (opensolaris section 2)

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ulimit(2)				   System Calls 				ulimit(2)

       ulimit - get and set process limits

       #include <ulimit.h>

       long ulimit(int cmd, /* newlimit */...);

       The  ulimit() function provides for control over process limits. It is effective in limit-
       ing the growth of regular files. Pipes are limited to PIPE_MAX bytes.

       The cmd values, defined in <ulimit.h>, include:

       UL_GETFSIZE    Return the soft file size limit of the process. The limit is  in	units  of
		      512-byte	blocks and is inherited by child processes. Files of any size can
		      be read. The return value is the integer part of the soft file  size  limit
		      divided  by  512.   If  the result cannot be represented as a long int, the
		      result is unspecified.

       UL_SETFSIZE    Set the hard and soft file size limits for output operations of the process
		      to  the  value of the second argument, taken as a long int. Any process may
		      decrease its own hard limit, but only a process with appropriate privileges
		      may  increase  the limit. The new file size limit is returned. The hard and
		      soft file size limits are set to the specified value multiplied by 512.  If
		      the result would overflow an rlimit_t, the actual value set is unspecified.

       UL_GMEMLIM     Get the maximum possible break value (see brk(2)).

       UL_GDESLIM     Get  the current value of the maximum number of open files per process con-
		      figured in the system.

       Upon successful completion, ulimit() returns the value of the requested limit.  Otherwise,
       -1 is returned, the limit is not changed, and errno is set to indicate the error.

       The ulimit() function will fail if:

       EINVAL	 The cmd argument is not valid.

       EPERM	 A process that has not asserted {PRIV_SYS_RESOURCE} in its effective set is try-
		 ing to increase its file size limit.

       Since all return values are permissible in a successful situation, an application  wishing
       to check for error situations should set errno to 0, then call ulimit(), and if it returns
       -1, check if errno is non-zero.

       The getrlimit() and setrlimit() functions provide a more general interface for controlling
       process limits, and are preferred over ulimit(). See getrlimit(2).

       See attributes(5) for descriptions of the following attributes:

       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       |Interface Stability	     |Standard			   |

       brk(2), getrlimit(2), write(2), attributes(5), privileges(5), standards(5)

SunOS 5.11				    1 Feb 2003					ulimit(2)
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