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NetBSD 6.1.5 - man page for ulimit (netbsd section 3)

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ULIMIT(3)			   BSD Library Functions Manual 			ULIMIT(3)

NAME
     ulimit -- get and set process limits

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <ulimit.h>

     long int
     ulimit(int cmd, ...);

DESCRIPTION
     The ulimit() function provides a method to query or alter resource limits of the calling
     process.  The method to be performed is specified by the cmd argument; possible values are:

     UL_GETFSIZE    Return the soft file size limit of the process.  The value returned is in
		    units of 512-byte blocks.  If the result cannot be represented in an object
		    of type long int, the result is unspecified.

     UL_SETFSIZE    Set the hard and soft file size limits of the process to the value of the
		    second argument passed, which is in units of 512-byte blocks, and which is
		    expected to be of type long int.  The new file size limit of the process is
		    returned.  Any process may decrease the limit, but raising it is only permit-
		    ted if the caller is the super-user.

     If successful, the ulimit() function will not change the setting of errno.

RETURN VALUES
     If successful, the ulimit() function returns the value of the requested limit.  Otherwise,
     it returns -1, sets errno to indicate an error, and the limit is not changed.  Therefore, to
     detect an error condition applications should set errno to 0, call ulimit(), and check if -1
     is returned and errno is non-zero.

ERRORS
     The ulimit() function will fail if:

     [EINVAL]		The cmd argument is not valid.

     [EPERM]		It was attempted to increase a limit, and the caller is not the super-
			user.

SEE ALSO
     getrlimit(2), setrlimit(2)

STANDARDS
     The ulimit() function conforms to X/Open System Interfaces and Headers Issue 5 (``XSH5'')
     and IEEE Std 1003.1-2001 (``POSIX.1'').  It was marked as obsolete in the IEEE Std
     1003.1-2008 (``POSIX.1'') revision, which recommended the use of getrlimit(2) and
     setrlimit(2) instead, noting that because ulimit() uses the type long rather than rlim_t, it
     may not be sufficient for file sizes on many current systems.

BSD					  April 30, 2010				      BSD
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