getdtablesize - Online Linux Manual PageSection : 3
Updated : 2023-02-05
Source : Linux man-pages 6.03

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NAMEgetdtablesize − get file descriptor table size

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LIBRARYStandard C library (libc, −lc)

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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

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DESCRIPTIONgetdtablesize() returns the maximum number of files a process can have open, one more than the largest possible value for a file descriptor.

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RETURN VALUEThe current limit on the number of open files per process.

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ERRORSOn Linux, getdtablesize() can return any of the errors described for getrlimit(2); see NOTES below.

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ATTRIBUTESFor an explanation of the terms used in this section, see attributes(7). InterfaceAttributeValue getdtablesize() Thread safetyMT-Safe

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STANDARDSSVr4, 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.

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NOTESThe glibc version of getdtablesize() calls getrlimit(2) and returns the current RLIMIT_NOFILE limit, or OPEN_MAX when that fails.

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SEE ALSOclose(2), dup(2), getrlimit(2), open(2) 0

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