unix/moduos: Convert module to use extmod version.

All variants now use extmod/moduos.c as their uos module implementation.
In particular this means they all have MICROPY_VFS enabled and use VfsPosix
for their filesystem.

As part of this, the available functions in uos become more consistent with
other ports:
- coverage variant gets uos.urandom
- minimal and standard variant get: unlink, chdir, getcwd, listdir

Signed-off-by: Damien George <damien@micropython.org>

1 files changed, 123 insertions, 0 deletions

diff --git a/ports/unix/moduos.c b/ports/unix/moduos.c
new file mode 100644
index 000000000..1262cd2e2
--- /dev/null
+++ b/ports/unix/moduos.c
@@ -0,0 +1,123 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2014-2018 Paul Sokolovsky
+ * Copyright (c) 2017-2022 Damien P. George
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include <fcntl.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "py/runtime.h"
+#include "py/mphal.h"
+
+#if defined(__GLIBC__) && defined(__GLIBC_PREREQ)
+#if __GLIBC_PREREQ(2, 25)
+#include <sys/random.h>
+#define _HAVE_GETRANDOM
+#endif
+#endif
+
+STATIC mp_obj_t mp_uos_getenv(mp_obj_t var_in) {
+    const char *s = getenv(mp_obj_str_get_str(var_in));
+    if (s == NULL) {
+        return mp_const_none;
+    }
+    return mp_obj_new_str(s, strlen(s));
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_1(mp_uos_getenv_obj, mp_uos_getenv);
+
+STATIC mp_obj_t mp_uos_putenv(mp_obj_t key_in, mp_obj_t value_in) {
+    const char *key = mp_obj_str_get_str(key_in);
+    const char *value = mp_obj_str_get_str(value_in);
+    int ret;
+
+    #if _WIN32
+    ret = _putenv_s(key, value);
+    #else
+    ret = setenv(key, value, 1);
+    #endif
+
+    if (ret == -1) {
+        mp_raise_OSError(errno);
+    }
+    return mp_const_none;
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_2(mp_uos_putenv_obj, mp_uos_putenv);
+
+STATIC mp_obj_t mp_uos_unsetenv(mp_obj_t key_in) {
+    const char *key = mp_obj_str_get_str(key_in);
+    int ret;
+
+    #if _WIN32
+    ret = _putenv_s(key, "");
+    #else
+    ret = unsetenv(key);
+    #endif
+
+    if (ret == -1) {
+        mp_raise_OSError(errno);
+    }
+    return mp_const_none;
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_1(mp_uos_unsetenv_obj, mp_uos_unsetenv);
+
+STATIC mp_obj_t mp_uos_system(mp_obj_t cmd_in) {
+    const char *cmd = mp_obj_str_get_str(cmd_in);
+
+    MP_THREAD_GIL_EXIT();
+    int r = system(cmd);
+    MP_THREAD_GIL_ENTER();
+
+    RAISE_ERRNO(r, errno);
+
+    return MP_OBJ_NEW_SMALL_INT(r);
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_1(mp_uos_system_obj, mp_uos_system);
+
+STATIC mp_obj_t mp_uos_urandom(mp_obj_t num) {
+    mp_int_t n = mp_obj_get_int(num);
+    vstr_t vstr;
+    vstr_init_len(&vstr, n);
+    #ifdef _HAVE_GETRANDOM
+    RAISE_ERRNO(getrandom(vstr.buf, n, 0), errno);
+    #else
+    int fd = open("/dev/urandom", O_RDONLY);
+    RAISE_ERRNO(fd, errno);
+    RAISE_ERRNO(read(fd, vstr.buf, n), errno);
+    close(fd);
+    #endif
+    return mp_obj_new_str_from_vstr(&mp_type_bytes, &vstr);
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_1(mp_uos_urandom_obj, mp_uos_urandom);
+
+STATIC mp_obj_t mp_uos_errno(size_t n_args, const mp_obj_t *args) {
+    if (n_args == 0) {
+        return MP_OBJ_NEW_SMALL_INT(errno);
+    }
+
+    errno = mp_obj_get_int(args[0]);
+    return mp_const_none;
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mp_uos_errno_obj, 0, 1, mp_uos_errno);