#include <stdlib.h>
int unsetenv(const char *name);
Partially implemented
IEEE Std 1003.1-2017
The unsetenv() function shall remove an environment variable from the environment of the calling process. The name
argument points to a string, which is the name of the variable to be removed. The named argument shall not contain
a '=' character. If the named variable does not exist in the current environment, the environment shall be
unchanged and the function is considered to have completed successfully.
The unsetenv() function shall update the list of pointers to which environ points.
Upon successful completion, zero shall be returned. Otherwise, -1 shall be returned, errno set to indicate the
error, and the environment shall be unchanged.
The function shall fail if:
EINVAL- The name argument points to an empty string, or points to a string containing a'='character.
Tested
None