NAME

       ulimit - get and set user limits

SYNOPSIS

       #include <ulimit.h>

       long ulimit(int cmd, long newlimit);

DESCRIPTION

       Warning:  this  routine  is  obsolete.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.

RETURN VALUE

       On  success, ulimit() returns a nonnegative value.  On error, -1 is returned, and errno is
       set appropriately.

ERRORS

       EPERM  An unprivileged process tried to increase a limit.

ATTRIBUTES

       For an explanation of the terms used in this section, see attributes(7).

       ┌──────────┬───────────────┬─────────┐
       │Interface │ Attribute     │ Value   │
       ├──────────┼───────────────┼─────────┤
       │ulimit()  │ Thread safety │ MT-Safe │
       └──────────┴───────────────┴─────────┘

CONFORMING TO

       SVr4, POSIX.1-2001.  POSIX.1-2008 marks ulimit() as obsolete.

SEE ALSO

       bash(1), getrlimit(2), setrlimit(2), sysconf(3)

COLOPHON

       This page is part of release 5.05 of the Linux man-pages project.  A  description  of  the
       project,  information  about  reporting  bugs, and the latest version of this page, can be
       found at https://www.kernel.org/doc/man-pages/.