In particular glibc's crypt will return NULL / errno == ENOSYS and other implementations might do that in future too. --- customize/crypt-c.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/customize/crypt-c.c b/customize/crypt-c.c index d5425cfaa..e358018cd 100644 --- a/customize/crypt-c.c +++ b/customize/crypt-c.c @@ -21,6 +21,7 @@ #include <stdio.h> #include <stdlib.h> #include <unistd.h> +#include <errno.h> #if HAVE_CRYPT_H #include <crypt.h> @@ -29,6 +30,7 @@ #include <caml/alloc.h> #include <caml/memory.h> #include <caml/mlvalues.h> +#include <caml/unixsupport.h> #pragma GCC diagnostic ignored "-Wmissing-prototypes" @@ -44,6 +46,8 @@ virt_customize_crypt (value keyv, value saltv) * is not thread safe. */ r = crypt (String_val (keyv), String_val (saltv)); + if (r == NULL) + unix_error (errno, (char *) "crypt", Nothing); rv = caml_copy_string (r); CAMLreturn (rv); -- 2.13.2