1ULIMIT(3)                  Linux Programmer's Manual                 ULIMIT(3)
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NAME

6       ulimit - get and set user limits
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SYNOPSIS

9       #include <ulimit.h>
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11       long ulimit(int cmd, long newlimit);
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DESCRIPTION

14       Warning: this routine is obsolete.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

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

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

40       For an  explanation  of  the  terms  used  in  this  section,  see  at‐
41       tributes(7).
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43       ┌────────────────────────────────────────────┬───────────────┬─────────┐
44       │Interface                                   │ Attribute     │ Value   │
45       ├────────────────────────────────────────────┼───────────────┼─────────┤
46       │ulimit()                                    │ Thread safety │ MT-Safe │
47       └────────────────────────────────────────────┴───────────────┴─────────┘
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CONFORMING TO

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

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

56       This  page  is  part of release 5.12 of the Linux man-pages project.  A
57       description of the project, information about reporting bugs,  and  the
58       latest     version     of     this    page,    can    be    found    at
59       https://www.kernel.org/doc/man-pages/.
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63Linux                             2021-03-22                         ULIMIT(3)
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