projects / thirdparty / man-pages.git / blame
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1 | .\" Hey Emacs! This file is -*- nroff -*- source. |
| 2 | .\" | |
| 3 | .\" Copyright 1993 Rickard E. Faith (faith@cs.unc.edu) | |
| 4 | .\" | |
| 5 | .\" Permission is granted to make and distribute verbatim copies of this | |
| 6 | .\" manual provided the copyright notice and this permission notice are | |
| 7 | .\" preserved on all copies. | |
| 8 | .\" | |
| 9 | .\" Permission is granted to copy and distribute modified versions of this | |
| 10 | .\" manual under the conditions for verbatim copying, provided that the | |
| 11 | .\" entire resulting derived work is distributed under the terms of a | |
| 12 | .\" permission notice identical to this one. | |
| c13182ef | 13 | .\" |
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14 | .\" Since the Linux kernel and libraries are constantly changing, this |
| 15 | .\" manual page may be incorrect or out-of-date. The author(s) assume no | |
| 16 | .\" responsibility for errors or omissions, or for damages resulting from | |
| 17 | .\" the use of the information contained herein. The author(s) may not | |
| 18 | .\" have taken the same level of care in the production of this manual, | |
| 19 | .\" which is licensed free of charge, as they might when working | |
| 20 | .\" professionally. | |
| c13182ef | 21 | .\" |
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22 | .\" Formatted or processed versions of this manual, if unaccompanied by |
| 23 | .\" the source, must acknowledge the copyright and authors of this work. | |
| 24 | .\" | |
| 25 | .\" Modified 2002-04-15 by Roger Luethi <rl@hellgate.ch> and aeb | |
| 26 | .\" | |
| cc4615cc | 27 | .TH GETDTABLESIZE 2 2007-07-26 "Linux" "Linux Programmer's Manual" |
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28 | .SH NAME |
| 29 | getdtablesize \- get descriptor table size | |
| 30 | .SH SYNOPSIS | |
| 31 | .B #include <unistd.h> | |
| 32 | .sp | |
| 33 | .B int getdtablesize(void); | |
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34 | .sp |
| 35 | .in -4n | |
| 36 | Feature Test Macro Requirements for glibc (see | |
| 37 | .BR feature_test_macros (7)): | |
| 38 | .in | |
| 39 | .sp | |
| 40 | .BR getdtablesize (): | |
| 41 | _BSD_SOURCE || _XOPEN_SOURCE\ >=\ 500 | |
| fea681da | 42 | .SH DESCRIPTION |
| e511ffb6 | 43 | .BR getdtablesize () |
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44 | returns the maximum number of files a process can have open, |
| 45 | one more than the largest possible value for a file descriptor. | |
| 46 | .SH "RETURN VALUE" | |
| 47 | The current limit on the number of open files per process. | |
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48 | .SH ERRORS |
| 49 | On Linux, | |
| 50 | .BR getdtablesize () | |
| 51 | can return any of the errors described for | |
| 52 | .BR getrlimit (2); | |
| 53 | see NOTES below. | |
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54 | .SH "CONFORMING TO" |
| 55 | SVr4, 4.4BSD (the | |
| 56 | .BR getdtablesize () | |
| 57 | function first appeared in 4.2BSD). | |
| 58 | It is not specified in POSIX.1-2001; | |
| 59 | portable applications should employ | |
| 60 | .I sysconf(_SC_OPEN_MAX) | |
| 61 | instead of this call. | |
| fea681da | 62 | .SH NOTES |
| e511ffb6 | 63 | .BR getdtablesize () |
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64 | is implemented as a libc library function. |
| 65 | The glibc version calls | |
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66 | .BR getrlimit (2) |
| 67 | and returns the current | |
| 68 | .B RLIMIT_NOFILE | |
| 69 | limit, or | |
| 70 | .B OPEN_MAX | |
| 71 | when that fails. | |
| 72 | The libc4 and libc5 versions return | |
| 73 | .B OPEN_MAX | |
| 74 | (set to 256 since Linux 0.98.4). | |
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75 | .SH "SEE ALSO" |
| 76 | .BR close (2), | |
| 77 | .BR dup (2), | |
| 78 | .BR getrlimit (2), | |
| 79 | .BR open (2) |