ulimit(3)ulimit(3)Nameulimit - get and set user limits
Syntax
long ulimit (cmd, newlimit)
int cmd;
long newlimit;
Description
This function provides control over process limits. An explanation of
the cmd values follow.
Value Explanation
1 Get the process's file size limit. The limit is in units of
512-byte blocks and is inherited by child processes. Files of
any size can be read.
2 Set the process's file size limit to the value of newlimit.
Any process can decrease this limit, but only a process with an
effective user ID of superuser can increase the limit. The
system call fails and the limit remains unchanged, if a process
with an effective user ID other than superuser attempts to
increase its file size limit.
3 Get the maximum possible break value. For further information,
see
Return Values
Upon successful completion, a nonnegative value is returned. Other‐
wise, a value of -1 is returned, and errno is set to indicate the
error.
Diagnostics
[EINVAL] Bad value for cmd.
[EPERM] The effective user ID of the calling process is not
superuser.
See Alsobrk(2), write(2)ulimit(3)
