09-12-2009
file size limit?
hi,
how can I find out what the limit of a file size is on unix?
thanks
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LEARN ABOUT CENTOS
ulimit
ULIMIT(3P) POSIX Programmer's Manual ULIMIT(3P)
PROLOG
This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the correspond-
ing Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.
NAME
ulimit - get and set process limits
SYNOPSIS
#include <ulimit.h>
long ulimit(int cmd, ...);
DESCRIPTION
The ulimit() function shall control process limits. The process limits that can be controlled by this function include the maximum size of
a single file that can be written (this is equivalent to using setrlimit() with RLIMIT_FSIZE). The cmd values, defined in <ulimit.h>,
include:
UL_GETFSIZE
Return the file size limit (RLIMIT_FSIZE) of the process. The limit shall be in units of 512-byte blocks and shall be inherited by
child processes. Files of any size can be read. The return value shall be the integer part of the soft file size limit divided by
512. If the result cannot be represented as a long, the result is unspecified.
UL_SETFSIZE
Set the file size limit for output operations of the process to the value of the second argument, taken as a long, multiplied by
512. If the result would overflow an rlim_t, the actual value set is unspecified. Any process may decrease its own limit, but only a
process with appropriate privileges may increase the limit. The return value shall be the integer part of the new file size limit
divided by 512.
The ulimit() function shall not change the setting of errno if successful.
As 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 to see if errno is non-zero.
RETURN VALUE
Upon successful completion, ulimit() shall return the value of the requested limit. Otherwise, -1 shall be returned and errno set to indi-
cate the error.
ERRORS
The ulimit() function shall fail and the limit shall be unchanged if:
EINVAL The cmd argument is not valid.
EPERM A process not having appropriate privileges attempts to increase its file size limit.
The following sections are informative.
EXAMPLES
None.
APPLICATION USAGE
None.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
getrlimit(), setrlimit(), write(), the Base Definitions volume of IEEE Std 1003.1-2001, <ulimit.h>
COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol-
ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE
and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained
online at http://www.opengroup.org/unix/online.html .
IEEE
/The Open Group 2003 ULIMIT(3P)