ulimit(3)

1ulimit(3)                  Library Functions Manual                  ulimit(3)
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NAME

6       ulimit - get and set user limits
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LIBRARY

9       Standard C library (libc, -lc)
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SYNOPSIS

12       #include <ulimit.h>
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14       [[deprecated]] long ulimit(int cmd, long newlimit);
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DESCRIPTION

17       Warning: this routine is obsolete.  Use getrlimit(2), setrlimit(2), and
18       sysconf(3) instead.  For the shell command ulimit, see bash(1).
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20       The ulimit() call will get or set some limit for the  calling  process.
21       The cmd argument can have one of the following values.
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23       UL_GETFSIZE
24              Return the limit on the size of a file, in units of 512 bytes.
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26       UL_SETFSIZE
27              Set the limit on the size of a file.
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29       3      (Not  implemented  for  Linux.)  Return the maximum possible ad‐
30              dress of the data segment.
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32       4      (Implemented but no symbolic  constant  provided.)   Return  the
33              maximum number of files that the calling process can open.
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RETURN VALUE

36       On  success, ulimit() returns a nonnegative value.  On error, -1 is re‐
37       turned, and errno is set to indicate the error.
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ERRORS

40       EPERM  An unprivileged process tried to increase a limit.
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ATTRIBUTES

43       For an  explanation  of  the  terms  used  in  this  section,  see  at‐
44       tributes(7).
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46       ┌────────────────────────────────────────────┬───────────────┬─────────┐
47       │Interface                                   │ Attribute     │ Value   │
48       ├────────────────────────────────────────────┼───────────────┼─────────┤
49       │ulimit()                                    │ Thread safety │ MT-Safe │
50       └────────────────────────────────────────────┴───────────────┴─────────┘
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STANDARDS

53       POSIX.1-2008.
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HISTORY

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