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CONFSTR(3)		   Linux Programmer's Manual		    CONFSTR(3)

NAME
       confstr - get configuration dependent string variables

SYNOPSIS
       #define _POSIX_C_SOURCE 2
       or
       #define _XOPEN_SOURCE
       #include	<unistd.h>

       size_t confstr(int name,	char *buf, size_t len);

DESCRIPTION
       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_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 characters if necessary, with  a
       null  character	as termination.	 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.

RETURN VALUE
       If  name	 does  not correspond to a valid configuration variable, conf-
       str() returns 0.

EXAMPLES
       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);
	  if ((pathbuf = malloc(n)) == NULL) abort();
	  confstr(_CS_PATH, pathbuf, n);

ERRORS
       If the value of name is invalid,	errno is set to	EINVAL.

CONFORMING TO
       proposed	POSIX.2

BUGS
       POSIX.2	is  not	yet an approved	standard; the information in this man-
       page is subject to change.

SEE ALSO
       sh(1), exec(3), system(3)

GNU				  1993-04-17			    CONFSTR(3)

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | EXAMPLES | ERRORS | CONFORMING TO | BUGS | SEE ALSO

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