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ulimit(3) [freebsd man page]

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

ulimit -- get and set process limits LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <ulimit.h> long ulimit(int cmd, ...); DESCRIPTION
The ulimit() function will get and set process limits. Currently this is limited to the maximum file size. The cmd argument is one of the following: UL_GETFSIZE will return the maximum file size in units of 512 blocks of the current process. UL_SETFSIZE will attempt to set the maximum file size of the current process and its children with the second argument expressed as a long. RETURN VALUES
Upon successful completion, ulimit() returns the value requested; otherwise the value -1 is returned and the global variable errno is set to indicate the error. ERRORS
The ulimit() function will fail if: [EINVAL] The command specified was invalid. [EPERM] The limit specified to ulimit() would have raised the maximum limit value, and the caller is not the super-user. SEE ALSO
getrlimit(2) STANDARDS
The ulimit() function conforms to IEEE Std 1003.1-2001 (``POSIX.1''). HISTORY
The ulimit() function first appeared in FreeBSD 5.0. BUGS
The ulimit() function provides limited precision for setting and retrieving process limits. If there is a need for greater precision than the type long provides, the getrlimit(2) and setrlimit(2) functions should be considered. BSD
January 4, 2003 BSD

Check Out this Related Man Page

ULIMIT(3)						     Linux Programmer's Manual							 ULIMIT(3)

ulimit - get and set user limits SYNOPSIS
#include <ulimit.h> long ulimit(int cmd, long newlimit); DESCRIPTION
Warning: This routine is obsolete. Use getrlimit(2), setrlimit(2), and sysconf(3) instead. For the shell command ulimit(), see bash(1). The ulimit() call will get or set some limit for the calling process. The cmd argument can have one of the following values. UL_GETFSIZE Return the limit on the size of a file, in units of 512 bytes. UL_SETFSIZE Set the limit on the size of a file. 3 (Not implemented for Linux.) Return the maximum possible address of the data segment. 4 (Implemented but no symbolic constant provided.) Return the maximum number of files that the calling process can open. RETURN VALUE
On success, ulimit() returns a nonnegative value. On error, -1 is returned, and errno is set appropriately. ERRORS
EPERM A unprivileged process tried to increase a limit. CONFORMING TO
SVr4, POSIX.1-2001. POSIX.1-2008 marks ulimit() as obsolete. SEE ALSO
bash(1), getrlimit(2), setrlimit(2), sysconf(3) COLOPHON
This page is part of release 3.27 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at Linux 2008-08-06 ULIMIT(3)
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