confstr - get configuration dependent string variables
confstr() gets the value of configuration-dependent string variables.
name argument is the system variable to be queried. The following variables are supported:
A string which identifies the GNU C library version on this system (e.g., "glibc 2.3.4").
A string which identifies the POSIX implementation supplied by this C library (e.g., "NPTL 2.3.4" or "linuxthreads-0.10").
A value for the PATH variable which indicates where all the POSIX.2 standard utilities can be found.
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 is zero and
buf is NULL, confstr() just returns the value as defined below.
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.
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.
The value of
name is invalid.
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