ulimit(2)ulimit(2)NAMEulimit - get and set user limits
SYNOPSIS
#include <ulimit.h>
long ulimit(int cmd, ... /* newlimit */ );
DESCRIPTION
This function provides for control over process limits. The cmd values
available are:
UL_GETFSIZE Get the regular file size limit of the process. The limit
is in units of 512-byte blocks and is inherited by child
processes. Files of any size can be read.
UL_SETFSIZE Set the regular file size limit of the process to the
value of newlimit , taken as a long. newlimit is
interpreted in units of 512-byte blocks. If, when
converted to bytes, newlimit exceeds RLIM_INFINITY, the
new file size limit is set to RLIM_INFINITY bytes. No
error is returned. Any process may decrease this limit,
but only a process with an effective user ID of super-user
may increase the limit.
UL_GMEMLIM Get the maximum possible break value [see brk(2)].
UL_GDESLIM Get the current value of the maximum number of open files
per process configured in the system.
The getrlimit system call provides a more general interface for
controlling process limits.
ulimit fails if the following is true:
EINVAL The cmd argument is not valid.
EPERM An attempt was made to increase the process's file size
limit and the calling process does not have the super-user
privilege.
SEE ALSObrk(2), getrlimit(2), write(2)NOTESulimit is effective in limiting the growth of regular files. Pipes are
currently limited to {PIPE_MAX}.
DIAGNOSTICS
Upon successful completion, a non-negative value is returned. Otherwise,
a value of -1 is returned and errno is set to indicate the error.
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