CONFSTR(3) MachTen Programmer’s Manual CONFSTR(3)

NAME
confstr - get string-valued configurable variables

SYNOPSIS
#include <unistd.h>

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

DESCRIPTION
This interface is obsoleted by sysctl(3).

The confstr() function provides a method for applications to get configu-
ration defined string values.

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 argu-
ment 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, -1 is returned and errno is set
appropriately. Otherwise, if the variable does not have a configuration
defined value, 0 is returned and errno is not modified. Otherwise, the
buffer size needed to hold the entire configuration-defined value is re-
turned. If this size is greater than the argument len, the string in buf
was truncated.

ERRORS
The confstr function may fail and set error for any of the errors speci-
fied 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.