NAME
getdtablesize - get file descriptor table size
LIBRARY
Standard C library (libc, -lc)
SYNOPSIS
#include <unistd.h>int getdtablesize(void);getdtablesize():
\n
Since glibc 2.20:
\n
_DEFAULT_SOURCE || ! (_POSIX_C_SOURCE >= 200112L)
\n
glibc 2.12 to glibc 2.19:
\n
_BSD_SOURCE || ! (_POSIX_C_SOURCE >= 200112L)
\n
Before glibc 2.12:
\n
_BSD_SOURCE || _XOPEN_SOURCE >= 500DESCRIPTION
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 VERSIONS below.
ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7).
| Interface | Attribute | Value |
| getdtablesize () | Thread safety | MT-Safe |
VERSIONS
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.
STANDARDS
None.
HISTORY
SVr4, 4.4BSD (first appeared in 4.2BSD).
SEE ALSO
close(2), dup(2), getrlimit(2), open(2)