Changes between Initial Version and Version 1 of UnaShellEssenziale

Timestamp:

Mar 23, 2019, 6:23:08 PM (5 years ago)

Author:

Mattia Monga

Comment:

--

UnaShellEssenziale

@@ +1 @@
+{{{#!c
+
+int printf(char*, ...);
+int scanf(char*, ...);
+int strcmp(char*, char*);
+int fork();
+int waitpid(int, int*, int);
+void exit(int);
+int execve(char*, char**, char**);
+
+#define NULL (void*)0
+
+int main(){
+        char command[4096];
+        // Sia argv che envp DEVONO terminare con un elemento NULL
+        char* argv[] = {"/bin/ls", NULL};
+        char* envp[] = {NULL};
+
+        while (1){
+                int pid, status;
+
+                printf("MYSHELL$ ");
+                scanf("%s", command);
+                if (strcmp(command, "exit") == 0)
+                        break;
+                pid = fork();
+                if (pid != 0) {
+                        waitpid(pid, &status, 0);
+                } else {
+                        argv[0] = command; 
+                        execve(argv[0], argv, envp); 
+                        printf("Da qui in poi esegue solo se l'execve e` fallita\n");
+                        exit(0);
+                }
+        }
+        return 0;
+}
+
+}}}