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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | ATTRIBUTES | CONFORMING TO | EXAMPLE | SEE ALSO | COLOPHON |
CONFSTR(3) Linux Programmer's Manual CONFSTR(3)
confstr - get configuration dependent string variables
#include <unistd.h>
size_t confstr(int name, char *buf, size_t len);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
confstr(): _POSIX_C_SOURCE >= 2 || _XOPEN_SOURCE
confstr() gets the value of configuration-dependent string variables.
The name argument is the system variable to be queried. The
following variables are supported:
_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").
_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").
_CS_PATH
A value for the PATH variable which indicates where all the
POSIX.2 standard utilities can be found.
If buf is not NULL and len is not zero, confstr() copies the value of
the string to buf truncated to len - 1 bytes if necessary, with a
null byte ('\0') as terminator. This can be detected by comparing
the return value of confstr() against len.
If len is zero and buf is NULL, confstr() just returns the value as
defined below.
If name is a valid configuration variable, 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 len, which means that the value in buf is truncated.
If name is a valid configuration variable, but that variable does not
have a value, then confstr() returns 0. If name does not correspond
to a valid configuration variable, confstr() returns 0, and errno is
set to EINVAL.
EINVAL The value of name is invalid.
For an explanation of the terms used in this section, see
attributes(7).
┌──────────┬───────────────┬─────────┐
│Interface │ Attribute │ Value │
├──────────┼───────────────┼─────────┤
│confstr() │ Thread safety │ MT-Safe │
└──────────┴───────────────┴─────────┘
POSIX.1-2001, POSIX.1-2008.
The following code fragment determines the path where to find the
POSIX.2 system utilities:
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);
getconf(1), sh(1), exec(3), fpathconf(3), pathconf(3), sysconf(3),
system(3)
This page is part of release 4.12 of the Linux man-pages project. A
description of the project, information about reporting bugs, and the
latest version of this page, can be found at
https://www.kernel.org/doc/man-pages/.
GNU 2015-08-08 CONFSTR(3)
Pages that refer to this page: exec(3), fpathconf(3), gnu_get_libc_version(3), sysconf(3), posixoptions(7)