getdtablesize
Section: C Library Functions (3)
Updated: 2023-02-05
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NAME
getdtablesize - get file descriptor table size
LIBRARY
Standard C library
(libc, -lc)
SYNOPSIS
#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
DESCRIPTION
getdtablesize()
returns the maximum number of files a process can have open,
one more than the largest possible value for a file descriptor.
RETURN VALUE
The current limit on the number of open files per process.
ERRORS
On Linux,
getdtablesize()
can return any of the errors described for
getrlimit(2);
see NOTES below.
ATTRIBUTES
For an explanation of the terms used in this section, see
attributes(7).
| Interface | Attribute | Value
|
|
getdtablesize()
| Thread safety | MT-Safe
|
STANDARDS
SVr4, 4.4BSD (the
getdtablesize()
function first appeared in 4.2BSD).
It is not specified in POSIX.1;
portable applications should employ
sysconf(_SC_OPEN_MAX)
instead of this call.
NOTES
The glibc version of
getdtablesize()
calls
getrlimit(2)
and returns the current
RLIMIT_NOFILE
limit, or
OPEN_MAX
when that fails.
SEE ALSO
close(2),
dup(2),
getrlimit(2),
open(2)
Index
- NAME
-
- LIBRARY
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ERRORS
-
- ATTRIBUTES
-
- STANDARDS
-
- NOTES
-
- SEE ALSO
-
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