ulimit(3) — Linux manual page

ulimit(3)               Library Functions Manual               ulimit(3)

NAME

       ulimit - get and set user limits

LIBRARY

       Standard C library (libc, -lc)

SYNOPSIS

       #include <ulimit.h>

       [[deprecated]] 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       Warning: this routine is obsolete.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 to indicate the error.

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 │
       └─────────────────────────────────────┴───────────────┴─────────┘

STANDARDS

       POSIX.1-2008.

HISTORY

       SVr4, POSIX.1-2001.  POSIX.1-2008 marks it as obsolete.

SEE ALSO

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

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Linux man-pages 6.9.1          2024-05-02                      ulimit(3)

Pages that refer to this page: getrlimit(2), syscalls(2), unimplemented(2), lttng-relayd(8)

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