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Fix #75696: posix_getgrnam fails to print details of group #3464
According to the POSIX specification of
According to the POSIX specification of `getgrnam_r()` the result of `sysconf(_SC_GETGR_R_SIZE_MAX)` is an initial value suggested for the size of the buffer, and `ERANGE` signals that insufficient storage was supplied. So if we get `ERANGE`, we try again with a buffer twice as big, and so on, instead of failing.