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Full Discussion: file size limit?
Top Forums UNIX for Advanced & Expert Users file size limit? Post 302352788 by jim mcnamara on Sunday 13th of September 2009 11:12:04 AM
Old 09-13-2009
ulimit specifies the number of open files.

As Frank Rizzo said, the maximum length of a file is determined by what data type of file pointer (32 bit or 64 bit) the filesystem supports.

The other controlling factor works on a per process basis - setrlimit() can change the max allowed filesize, see man setrlimit. The kernel imposed hard limit for filesize in setrlimit is something you can see from the command line with getconf or in C with fpathconf() & pathconf()

_LFS64_STDIO for linux means largefiles is supported by stdio.h routines - as an example.

You need to read thru unistd.h and limits.h to see what your system has.

Most modern unix flavors support largefiles - i.e., 64 bit off_t variables for file pointers.
 

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

NAME
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Warning: This routine is obsolete.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 http://www.kernel.org/doc/man-pages/. Linux 2008-08-06 ULIMIT(3)
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