ULIMIT Section: Linux Programmer's Manual (3) Updated: 12 June 2025 Index   NAME ulimit - get and set user limits   SYNOPSIS #include <ulimit.h> long ulimit(int cmd, long newlimit);   DESCRIPTION Warning: This routine is obsolete. The include file is no longer instead. For the shell command ulimit, see The ulimit call will get or set some limit for the current 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 A non-root process tried to increase a limit.   CONFORMING TO SVID.   SEE ALSO   Index NAME SYNOPSIS DESCRIPTION RETURN VALUE ERRORS CONFORMING TO SEE ALSO This document was created by using the manual pages. Time: 11:58:07 GMT, March 24, 2025