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CONFSTR(3) BSD Library Functions Manual CONFSTR(3)
confstr -- get string-valued configurable variables
Standard C Library (libc, -lc)
confstr(int name, char *buf, size_t len);
This interface is obsoleted by sysctl(3).
The confstr() function provides a method for applications to get configuration defined
The name argument specifies the system variable to be queried. Symbolic constants for each
name value are found in the <unistd.h> header. 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:
Return a value for the PATH environment variable that finds all the standard utili-
If the call to confstr is not successful, 0 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 returned. If this size is greater than the argument len, the string in buf
The confstr function may fail and set error 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.
The confstr function conforms to IEEE Std 1003.2-1992 (``POSIX.2'').
The confstr function first appeared in 4.4BSD.
The standards require us to return 0 both on errors, and when the value is not set.
BSD April 22, 2010 BSD
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