--- /dev/null
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include <minix/config.h>
+#include <minix/com.h>
+#include <minix/const.h>
+#include <minix/type.h>
+#include <minix/ipc.h>
+#include <minix/syslib.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+
+
+/* This array defines all known requests. */
+PRIVATE char *known_requests[] = {
+ "up",
+ "down",
+ "catch for illegal requests"
+};
+#define ILLEGAL_REQUEST sizeof(known_requests)/sizeof(char *)
+
+/* Global error number set for failed system calls. */
+#define OK 0
+extern int errno;
+
+/* Define names for arguments provided to this utility. The first few
+ * arguments are required and have a known index. Thereafter, some optional
+ * argument pairs like "-args arglist" follow.
+ */
+#define ARG_NAME 0 /* own application name */
+#define ARG_REQUEST 1 /* request to perform */
+#define ARG_PATH 2 /* binary of system service */
+
+#define MIN_ARG_COUNT 3 /* minimum number of arguments */
+
+#define ARG_ARGS "-args" /* list of arguments to be passed */
+#define ARG_DEV "-dev" /* major device number for drivers */
+#define ARG_PRIV "-priv" /* required privileges */
+
+/* The function parse_arguments() verifies and parses the command line
+ * parameters passed to this utility. Request parameters that are needed
+ * are stored globally in the following variables:
+ */
+PRIVATE int req_type;
+PRIVATE char *req_path;
+PRIVATE char *req_args;
+PRIVATE int req_major;
+PRIVATE char *req_priv;
+
+/* An error occurred. Report the problem, print the usage, and exit.
+ */
+PRIVATE void print_usage(char *app_name, char *problem)
+{
+ printf("Warning, %s\n", problem);
+ printf("Usage:\n");
+ printf(" %s <request> <binary> [%s <args>] [%s <special>]\n",
+ app_name, ARG_ARGS, ARG_DEV);
+ printf("\n");
+}
+
+/* An unexpected, unrecoverable error occurred. Report and exit.
+ */
+PRIVATE void panic(char *app_name, char *mess, int num)
+{
+ printf("Panic in %s: %s", app_name, mess);
+ if (num != NO_NUM) printf(": %d", num);
+ printf("\n");
+ exit(EGENERIC);
+}
+
+
+/* Parse and verify correctness of arguments. Report problem and exit if an
+ * error is found. Store needed parameters in global variables.
+ */
+PRIVATE int parse_arguments(int argc, char **argv)
+{
+ struct stat stat_buf;
+ int i;
+
+ /* Verify argument count. */
+ if (! argc >= MIN_ARG_COUNT) {
+ print_usage(argv[ARG_NAME], "wrong number of arguments");
+ exit(EINVAL);
+ }
+
+ /* Verify request type. */
+ for (req_type=0; req_type< ILLEGAL_REQUEST; req_type++) {
+ if (strcmp(known_requests[req_type],argv[ARG_REQUEST])==0) break;
+ }
+ if (req_type == ILLEGAL_REQUEST) {
+ print_usage(argv[ARG_NAME], "illegal request type");
+ exit(ENOSYS);
+ }
+
+ /* Verify the name of the binary of the system service. */
+ req_path = argv[ARG_PATH];
+ if (req_path[0] != '/') {
+ print_usage(argv[ARG_NAME], "binary should be absolute path");
+ exit(EINVAL);
+ }
+ if (stat(req_path, &stat_buf) == -1) {
+ print_usage(argv[ARG_NAME], "couldn't get status of binary");
+ exit(errno);
+ }
+ if (! (stat_buf.st_mode & S_IFREG)) {
+ print_usage(argv[ARG_NAME], "binary is not a regular file");
+ exit(EINVAL);
+ }
+
+ /* Check optional arguments that come in pairs like "-args arglist". */
+ for (i=MIN_ARG_COUNT; i<argc; i=i+2) {
+ if (! (i+1 < argc)) {
+ print_usage(argv[ARG_NAME], "optional argument not complete");
+ exit(EINVAL);
+ }
+ if (strcmp(argv[i], ARG_ARGS)==0) {
+ req_args = argv[i+1];
+ }
+ else if (strcmp(argv[i], ARG_DEV)==0) {
+ if (stat(argv[i+1], &stat_buf) == -1) {
+ print_usage(argv[ARG_NAME], "couldn't get status of device node");
+ exit(errno);
+ }
+ if ( ! (stat_buf.st_mode & (S_IFBLK | S_IFCHR))) {
+ print_usage(argv[ARG_NAME], "special file is not a device node");
+ exit(EINVAL);
+ }
+ req_major = (stat_buf.st_rdev >> MAJOR) & BYTE;
+ }
+ else if (strcmp(argv[i], ARG_ARGS)==0) {
+ req_priv = argv[i+1];
+ }
+ else {
+ print_usage(argv[ARG_NAME], "unknown optional argument given");
+ exit(EINVAL);
+ }
+ }
+
+ /* Return the request number if no error were found. */
+ return(i);
+}
+
+
+/* Main program.
+ */
+PUBLIC int main(int argc, char **argv)
+{
+ message m;
+ int result;
+ int s;
+
+ /* Verify and parse the command line arguments. All arguments are checked
+ * here. If an error occurs, the problem is reported and exit(2) is called.
+ * all needed parameters to perform the request are extracted and stored
+ * global variables.
+ */
+ parse_arguments(argc, argv);
+
+ /* Arguments seem fine. Try to perform the request. Only valid requests
+ * should end up here. The default is used for not yet supported requests.
+ */
+ switch(req_type+SRV_RQ_BASE) {
+ case SRV_UP:
+ m.SRV_PATH_ADDR = req_path;
+ m.SRV_PATH_LEN = strlen(req_path);
+ m.SRV_ARGS_ADDR = req_args;
+ m.SRV_ARGS_LEN = strlen(req_args);
+ m.SRV_DEV_MAJOR = req_major;
+ if (OK != (s=_taskcall(SM_PROC_NR, SRV_UP, &m)))
+ panic(argv[ARG_NAME], "sendrec to manager server failed", s);
+ result = m.m_type;
+ break;
+ case SRV_DOWN:
+ case SRV_STATUS:
+ default:
+ print_usage(argv[ARG_NAME], "request is not yet supported");
+ result = EGENERIC;
+ }
+ return(result);
+}
+