samples: posix: uname: add toy uname cmd

Added `uname` shell cmd, basically copied from nuttx.

Signed-off-by: Yong Cong Sin <ycsin@meta.com>

samples/posix/uname/prj.conf

@@ -1 +1,3 @@
 CONFIG_POSIX_API=y
+CONFIG_SHELL=y
+CONFIG_SHELL_GETOPT=y

samples/posix/uname/src/main.c

@@ -5,7 +5,9 @@
  */
 
 #include <zephyr/kernel.h>
+#include <zephyr/shell/shell.h>
 #include <sys/utsname.h>
+#include <unistd.h>
 
 int main(void)
 {
@@ -23,6 +25,151 @@ int main(void)
  return 0;
 }
 
+#define UNAME_KERNEL (1 << 0)
+#define UNAME_NODE (1 << 1)
+#define UNAME_RELEASE (1 << 2)
+#define UNAME_VERSION (1 << 3)
+#define UNAME_MACHINE (1 << 4)
+#define UNAME_PLATFORM (1 << 5)
+#define UNAME_UNKNOWN (1 << 6)
+#define UNAME_ALL \
+ (UNAME_KERNEL | UNAME_NODE | UNAME_RELEASE | UNAME_VERSION | UNAME_MACHINE | UNAME_PLATFORM)
+void getopt_init(void);
+static int uname_cmd_handler(const struct shell *sh, size_t argc, char **argv)
+{
+ struct utsname info;
+ unsigned int set;
+ int option;
+ bool badarg;
+ bool first;
+ int ret;
+ int i;
+
+ set = 0;
+ badarg = false;
+
+ /* Get the uname options */
+
+ optind = 1;
+ while ((option = getopt(argc, argv, "asonrvmpi")) != -1) {
+ switch (option) {
+ case 'a':
+ set = UNAME_ALL;
+ break;
+
+ case 'o':
+ case 's':
+ set |= UNAME_KERNEL;
+ break;
+
+ case 'n':
+ set |= UNAME_NODE;
+ break;
+
+ case 'r':
+ set |= UNAME_RELEASE;
+ break;
+
+ case 'v':
+ set |= UNAME_VERSION;
+ break;
+
+ case 'm':
+ set |= UNAME_MACHINE;
+ break;
+
+ case 'p':
+ if (set != UNAME_ALL) {
+ set |= UNAME_UNKNOWN;
+ }
+ break;
+
+ case 'i':
+ set |= UNAME_PLATFORM;
+ break;
+
+ case '?':
+ default:
+ badarg = true;
+ break;
+ }
+ }
+
+ /* If a bad argument was encountered, then return without processing the
+ * command
+ */
+
+ if (badarg) {
+ struct getopt_state *state = getopt_state_get();
+
+ shell_error(sh, "uname: illegal option -- %c", state->optopt);
+ shell_print(sh, "usage: uname [-asonrvmpi]");
+ return -1;
+ }
+
+ /* If nothing is provided on the command line, the default is -s */
+
+ if (set == 0) {
+ set = UNAME_KERNEL;
+ }
+
+ /* Get uname data */
+
+ ret = uname(&info);
+ if (ret < 0) {
+ shell_error(sh, "uname: returned %d", ret);
+ return -1;
+ }
+
+ /* Process each option */
+
+ first = true;
+ for (i = 0; set != 0; i++) {
+ unsigned int mask = (1 << i);
+
+ if ((set & mask) != 0) {
+ set &= ~mask;
+ switch (i) {
+ case 0: /* print the kernel/operating system name */
+ shell_fprintf(sh, SHELL_NORMAL, "%s", info.sysname);
+ break;
+
+ case 1: /* Print nodename */
+ shell_fprintf(sh, SHELL_NORMAL, "%s", info.nodename);
+ break;
+
+ case 2: /* Print the kernel release */
+ shell_fprintf(sh, SHELL_NORMAL, "%s", info.release);
+ break;
+
+ case 3: /* Print the kernel version */
+ shell_fprintf(sh, SHELL_NORMAL, "%s", info.version);
+ break;
+
+ case 4: /* Print the machine hardware name */
+ shell_fprintf(sh, SHELL_NORMAL, "%s", info.machine);
+ break;
+
+ case 5: /* Print the machine platform name */
+ shell_fprintf(sh, SHELL_NORMAL, "%s", CONFIG_BOARD);
+ break;
+
+ case 6: /* Print "unknown" */
+ shell_fprintf(sh, SHELL_NORMAL, "%s", "unknown");
+ break;
+
+ default:
+ shell_error(sh, "uname: illegal option -- %d", i);
+ return -1;
+ }
+
+ shell_fprintf(sh, SHELL_NORMAL, " ");
+ }
+ }
+
+ shell_fprintf(sh, SHELL_NORMAL, "\n");
 
  return 0;
 }
+
+SHELL_CMD_REGISTER(uname, NULL, NULL, uname_cmd_handler);