ulimit(2)                                                         ulimit(2)

NAME
     ulimit - get and set process limits

SYNOPSIS
     #include <ulimit.h>

     long int ulimit(int cmd, ... /* newlimit */ );

DESCRIPTION
     This function provides for control over process limits. The cmd values
     available are:

     ULGETFSIZE  Return the soft 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. The return
                  value is the integer part of the soft file size limit
                  divided by 512. If the result cannot be represented as a
                  long int the result is unspecified.

     ULSETFSIZE  Set the hard and soft file size limits for output opera-
                  tions of the process to the value of the second argument,
                  taken as a long int. Any process may decrease its own hard
                  limit, but only a process with appropriate privileges may
                  increase the limit. The new file size limit is returned.
                  The hard and soft file size limits are set to the speci-
                  fied value multiplied by 512. If the result would overflow
                  an rlimitt the actual value set is unspecified.

     ULGMEMLIM   Gets the maximum possible break value [see brk(2)].

     ULGDESLIM   Gets the current value of the maximum number of open
                  files per process configured in the system.

ERRORS
     The following error code descriptions are function-specific. You will
     find a general description in introprm2(2) or in errno(5).

     The ulimit() system call fails if either of the following applies:

     EINVAL    The cmd argument is not valid.

     EPERM     A process with an effective user ID other than superuser
               attempts to increase its file size limit.

NOTES
     ulimit() is effective in limiting the growth of regular files. Pipes
     are currently limited to PIPEMAX.

     The ulimit() function will return "unlimited" if the current soft file
     size limit cannot be represented correctly in an object of type long.
     As this function is already obsolescent, the use of getrlimit() and
     setrlimit() is recommended for getting and setting process limits.



Page 1                       Reliant UNIX 5.44                Printed 11/98

ulimit(2)                                                         ulimit(2)

RESULT
     Upon successful completion, a non-negative value is returned. Other-
     wise, a value of -1 is returned and errno is set to indicate the
     error.

SEE ALSO
     brk(2), getrlimit(2), setrlimit(2), write(2), lfs(5), ulimit(5).















































Page 2                       Reliant UNIX 5.44                Printed 11/98