ulimit - get and set user limits

       For an explanation of the terms used in this section, see attributes(7).
       ┌─────────────────────────────────────────────────────────────────────────────┬───────────────┬─────────┐
       │ Interface                                                                   │ Attribute     │ Value   │
       ├─────────────────────────────────────────────────────────────────────────────┼───────────────┼─────────┤
       │ ulimit()                                                                    │ Thread safety │ MT-Safe │
       └─────────────────────────────────────────────────────────────────────────────┴───────────────┴─────────┘

       Warning:  this  routine  is  obsolete.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.

EPERM  An unprivileged process tried to increase a limit.

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

       Standard C library (libc, -lc)

       ulimit - get and set user limits

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

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

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

       POSIX.1-2008.

#include<ulimit.h>[[deprecated]]longulimit(intcmd,longnewlimit);