Originální popis anglicky:
ulimit - get and set process limits
Návod, kniha: POSIX Programmer's Manual
#include <ulimit.h>
long ulimit(int
cmd, ...);
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.
Upon successful completion,
ulimit() shall return the value of the
requested limit. Otherwise, -1 shall be returned and
errno set to
indicate the error.
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.
None.
None.
None.
None.
getrlimit() ,
setrlimit() ,
write() , the Base Definitions
volume of IEEE Std 1003.1-2001,
<ulimit.h>
Portions of this text are reprinted and reproduced in electronic form from IEEE
Std 1003.1, 2003 Edition, Standard for Information Technology -- 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
.
