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FreeBSD 11.0 - man page for confstr (freebsd section 3)

CONFSTR(3)						   BSD Library Functions Manual 						CONFSTR(3)

NAME
confstr -- get string-valued configurable variables
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <unistd.h> size_t confstr(int name, char *buf, size_t len);
DESCRIPTION
This interface is specified by IEEE Std 1003.1-2001 (``POSIX.1''). A more flexible (but non-portable) interface is provided by sysctl(3). The confstr() function provides a method for applications to get configuration defined string values. Shell programmers needing access to these parameters should use the getconf(1) utility. The name argument specifies the system variable to be queried. Symbolic constants for each name value are found in the include file <unistd.h>. The len argument specifies the size of the buffer referenced by the argument buf. If len is non-zero, buf is a non-null pointer, and name has a value, up to len - 1 bytes of the value are copied into the buffer buf. The copied value is always null terminated. The available values are as follows: _CS_PATH Return a value for the PATH environment variable that finds all the standard utilities.
RETURN VALUES
If the call to confstr() is not successful, 0 is returned and errno is set appropriately. Otherwise, if the variable does not have a config- uration defined value, 0 is returned and errno is not modified. Otherwise, the buffer size needed to hold the entire configuration-defined value is returned. If this size is greater than the argument len, the string in buf was truncated.
ERRORS
The confstr() function may fail and set errno for any of the errors specified for the library functions malloc(3) and sysctl(3). In addition, the following errors may be reported: [EINVAL] The value of the name argument is invalid.
SEE ALSO
getconf(1), pathconf(2), sysconf(3), sysctl(3)
HISTORY
The confstr() function first appeared in 4.4BSD.
BSD
December 3, 2006 BSD