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-'\" t
-.\" Copyright (c) 1993 by Thomas Koenig (ig25@rz.uni-karlsruhe.de)
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.\" Modified Sat Jul 24 19:53:02 1993 by Rik Faith (faith@cs.unc.edu)
-.\"
-.\" FIXME Many more values for 'name' are supported, some of which
-.\" are documented under 'info libc confstr'.
-.\" See <bits/confname.h> for the rest.
-.\" These should all be added to this page.
-.\" See also the POSIX.1-2001 specification of confstr()
-.\"
-.TH confstr 3 (date) "Linux man-pages (unreleased)"
-.SH NAME
-confstr \- get configuration dependent string variables
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <unistd.h>
-.P
-.BI "size_t confstr(int " "name" ", char " buf [. size "], size_t " size );
-.fi
-.P
-.RS -4
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.RE
-.P
-.BR confstr ():
-.nf
-    _POSIX_C_SOURCE >= 2 || _XOPEN_SOURCE
-.fi
-.SH DESCRIPTION
-.BR confstr ()
-gets the value of configuration-dependent string variables.
-.P
-The
-.I name
-argument is the system variable to be queried.
-The following variables are supported:
-.TP
-.BR _CS_GNU_LIBC_VERSION " (GNU C library only; since glibc 2.3.2)"
-A string which identifies the GNU C library version on this system
-(e.g., "glibc 2.3.4").
-.TP
-.BR _CS_GNU_LIBPTHREAD_VERSION " (GNU C library only; since glibc 2.3.2)"
-A string which identifies the POSIX implementation supplied by this
-C library (e.g., "NPTL 2.3.4" or "linuxthreads\-0.10").
-.TP
-.B _CS_PATH
-A value for the
-.B PATH
-variable which indicates where all the POSIX.2 standard utilities can
-be found.
-.P
-If
-.I buf
-is not NULL and
-.I size
-is not zero,
-.BR confstr ()
-copies the value of the string to
-.I buf
-truncated to
-.I size \- 1
-bytes if necessary, with a null byte (\[aq]\e0\[aq]) as terminator.
-This can be detected by comparing the return value of
-.BR confstr ()
-against
-.IR size .
-.P
-If
-.I size
-is zero and
-.I buf
-is NULL,
-.BR confstr ()
-just returns the value as defined below.
-.SH RETURN VALUE
-If
-.I name
-is a valid configuration variable,
-.BR confstr ()
-returns the number of bytes (including the terminating null byte)
-that would be required to hold the entire value of that variable.
-This value may be greater than
-.IR size ,
-which means that the value in
-.I buf
-is truncated.
-.P
-If
-.I name
-is a valid configuration variable,
-but that variable does not have a value, then
-.BR confstr ()
-returns 0.
-If
-.I name
-does not correspond to a valid configuration variable,
-.BR confstr ()
-returns 0, and
-.I errno
-is set to
-.BR EINVAL .
-.SH ERRORS
-.TP
-.B EINVAL
-The value of
-.I name
-is invalid.
-.SH ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.TS
-allbox;
-lbx lb lb
-l l l.
-Interface	Attribute	Value
-T{
-.na
-.nh
-.BR confstr ()
-T}	Thread safety	MT-Safe
-.TE
-.SH STANDARDS
-POSIX.1-2008.
-.SH HISTORY
-POSIX.1-2001.
-.SH EXAMPLES
-The following code fragment determines the path where to find
-the POSIX.2 system utilities:
-.P
-.in +4n
-.EX
-char *pathbuf;
-size_t n;
-\&
-n = confstr(_CS_PATH, NULL, (size_t) 0);
-pathbuf = malloc(n);
-if (pathbuf == NULL)
-    abort();
-confstr(_CS_PATH, pathbuf, n);
-.EE
-.in
-.SH SEE ALSO
-.BR getconf (1),
-.BR sh (1),
-.BR exec (3),
-.BR fpathconf (3),
-.BR pathconf (3),
-.BR sysconf (3),
-.BR system (3)