GETDTABLESIZE(2) BSD System Calls Manual GETDTABLESIZE(2)NAME
getdtablesize -- get file descriptor limit
Standard C Library (libc, -lc)
The getdtablesize() system call returns the maximum number of file descriptors that the current process may open. The maximum file descrip-
tor number that the system may assign is the return value minus one. Existing file descriptor numbers may be higher if the limit was lowered
after they were opened.
SEE ALSO close(2), closefrom(2), dup(2), getrlimit(2), sysconf(2)HISTORY
The getdtablesize() system call appeared in 4.2BSD.
BSD April 24, 2013 BSD
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GETDTABLESIZE(2) Linux Programmer's Manual GETDTABLESIZE(2)NAME
getdtablesize - get descriptor table size
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
Since glibc 2.12:
!(_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600)
Before glibc 2.12:
_BSD_SOURCE || _XOPEN_SOURCE >= 500 || _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED
getdtablesize() returns the maximum number of files a process can have open, one more than the largest possible value for a file descrip-
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 NOTES below.
SVr4, 4.4BSD (the getdtablesize() function first appeared in 4.2BSD). It is not specified in POSIX.1-2001; portable applications should
employ sysconf(_SC_OPEN_MAX) instead of this call.
getdtablesize() is implemented as a libc library function. The glibc version calls getrlimit(2) and returns the current RLIMIT_NOFILE
limit, or OPEN_MAX when that fails. The libc4 and libc5 versions return OPEN_MAX (set to 256 since Linux 0.98.4).
SEE ALSO close(2), dup(2), getrlimit(2), open(2)COLOPHON
This page is part of release 3.27 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
Linux 2010-09-20 GETDTABLESIZE(2)
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