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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | ATTRIBUTES | VERSIONS | STANDARDS | HISTORY | SEE ALSO | COLOPHON |
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getdtablesize(3) Library Functions Manual getdtablesize(3)
getdtablesize - get file descriptor table size
Standard C library (libc, -lc)
#include <unistd.h>
int getdtablesize(void);
Feature Test Macro Requirements for glibc (see
feature_test_macros(7)):
getdtablesize():
Since glibc 2.20:
_DEFAULT_SOURCE || ! (_POSIX_C_SOURCE >= 200112L)
glibc 2.12 to glibc 2.19:
_BSD_SOURCE || ! (_POSIX_C_SOURCE >= 200112L)
Before glibc 2.12:
_BSD_SOURCE || _XOPEN_SOURCE >= 500
getdtablesize() returns the maximum number of files a process can
have open, one more than the largest possible value for a file
descriptor.
The current limit on the number of open files per process.
On Linux, getdtablesize() can return any of the errors described
for getrlimit(2); see VERSIONS below.
For an explanation of the terms used in this section, see
attributes(7).
┌─────────────────────────────────────┬───────────────┬─────────┐
│ Interface │ Attribute │ Value │
├─────────────────────────────────────┼───────────────┼─────────┤
│ getdtablesize() │ Thread safety │ MT-Safe │
└─────────────────────────────────────┴───────────────┴─────────┘
The glibc version of getdtablesize() calls getrlimit(2) and
returns the current RLIMIT_NOFILE limit, or OPEN_MAX when that
fails.
Portable applications should employ sysconf(_SC_OPEN_MAX) instead
of this call.
None.
SVr4, 4.4BSD (first appeared in 4.2BSD).
close(2), dup(2), getrlimit(2), open(2)
This page is part of the man-pages (Linux kernel and C library
user-space interface documentation) project. Information about
the project can be found at
⟨https://www.kernel.org/doc/man-pages/⟩. If you have a bug report
for this manual page, see
⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
This page was obtained from the tarball man-pages-6.9.1.tar.gz
fetched from
⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
2024-06-26. If you discover any rendering problems in this HTML
version of the page, or you believe there is a better or more up-
to-date source for the page, or you have corrections or
improvements to the information in this COLOPHON (which is not
part of the original manual page), send a mail to
[email protected]
Linux man-pages 6.9.1 2024-06-16 getdtablesize(3)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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