ulimit - get and set user limits
Standard C library (
libc,
-lc)
#include <ulimit.h>
[[deprecated]] long ulimit(int cmd, long newlimit);
Warning: this routine is obsolete.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.
On success,
ulimit() returns a nonnegative value. On error, -1 is
returned, and
errno is set to indicate the error.
- EPERM
- An unprivileged process tried to increase a limit.
For an explanation of the terms used in this section, see
attributes(7).
Interface |
Attribute |
Value |
ulimit () |
Thread safety |
MT-Safe |
SVr4, POSIX.1-2001. POSIX.1-2008 marks
ulimit() as obsolete.
bash(1),
getrlimit(2),
setrlimit(2),
sysconf(3)