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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)						   BSD Library Functions Manual 						 ULIMIT(3)

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 permitted 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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