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ulimit(2)

ulimit(2)                        System Calls                        ulimit(2)



NAME
       ulimit - get and set process limits

SYNOPSIS
       #include <ulimit.h>

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

DESCRIPTION
       The  ulimit()  function provides for control over process limits. It is
       effective in limiting the growth of regular files. Pipes are limited to
       PIPE_MAX bytes.


       The cmd values, defined in <ulimit.h>, include:

       UL_GETFSIZE    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 repre‐
                      sented as a long int, the result is unspecified.


       UL_SETFSIZE    Set the hard and soft file size limits for output opera‐
                      tions  of  the  process to the value of the second argu‐
                      ment, 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 specified value multiplied by 512. If the
                      result  would overflow an rlimit_t, the actual value set
                      is unspecified.


       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.


RETURN VALUES
       Upon successful completion, ulimit() returns the value of the requested
       limit. Otherwise, −1 is returned, the limit is not changed,  and  errno
       is set to indicate the error.

ERRORS
       The ulimit() function will fail if:

       EINVAL    The cmd argument is not valid.


       EPERM     A  process  that  has not asserted {PRIV_SYS_RESOURCE} in its
                 effective set is trying to increase its file size limit.


USAGE
       Since 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  if  errno  is  non-
       zero.


       The getrlimit() and setrlimit() functions provide a more general inter‐
       face for controlling process limits, and are preferred  over  ulimit().
       See getrlimit(2).

ATTRIBUTES
       See attributes(7) for descriptions of the following attributes:


       tab()  box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRIBUTE TYPEAT‐
       TRIBUTE  VALUE  _  Interface  StabilityCommitted  _  StandardSee  stan‐
       dards(7).


SEE ALSO
       write(2),  brk(2),  getrlimit(2),  privileges(7),  attributes(7), stan‐
       dards(7)



Oracle Solaris 11.4               1 Feb 2003                         ulimit(2)
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