karchnu/some-usable-scripts
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Changement du mini_shell en ... mieux

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This commit is contained in:
Philippe Pittoli 2011-02-10 15:20:47 +01:00
parent 6a52773b91
commit 32908dae0b
1 changed files with 73 additions and 26 deletions
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99
mini_shell.c
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@ -1,5 +1,7 @@
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <dirent.h>
#include <fcntl.h>
#include <stdio.h>
#include <assert.h>
@ -12,10 +14,10 @@ char * lireChaine3();
void changeDirectory(char * path);
int subString (const char *chaine, int debut, int fin, char *result);
void erreur(char *s);
void executionArrierePlan(char *arg1);
void execution(char *arg1, char *arg2, char *arg3);
void executionArrierePlan(char *arg1, char **env);
void execution(char *arg1, char *arg2, char *arg3, char **env);
int main(int argc, char **argv)
int main(int argc, char **argv, char **env)
{
int commandeInterne;
char *arg1, *arg2, *arg3;
@ -27,34 +29,61 @@ int main(int argc, char **argv)
commandeInterne = 0;
lire(&arg1, &arg2, &arg3);
if(strcmp(arg1, "cd") == 0)
if(arg1 != NULL)
{
commandeInterne = 1;
// On change de répertoire
changeDirectory(arg2);
}
if(strcmp(arg1, "exit") == 0)
{
commandeInterne = 1;
exit(0);
}
if(commandeInterne == 0)
{
execution(arg1, arg2, arg3);
if(strcmp(arg1, "cd") == 0)
{
commandeInterne = 1;
// On change de répertoire
changeDirectory(arg2);
}
if(strcmp(arg1, "exit") == 0)
{
commandeInterne = 1;
exit(0);
}
if(commandeInterne == 0)
{
execution(arg1, arg2, arg3, env);
}
}
}
}
void execution(char *arg1, char *arg2, char *arg3)
void execution(char *arg1, char *arg2, char *arg3, char **env)
{
int pid;
char ** options = malloc(sizeof(char *)*3);
options[0] = arg1;
options[1] = NULL;
int status;
if(arg2 != NULL)
{
if(strcmp(arg2, "&") == 0)
executionArrierePlan(arg1);
executionArrierePlan(arg1, env);
if(strcmp(arg2, "<") == 0)
{
printf("Commande avec <\n");
if((pid = fork()) == 0)
{
int fd0;
if((fd0 = open(arg3, O_RDONLY)) == -1)
{
erreur("Ouverture fichier");
exit(EXIT_FAILURE);
}
close(0); dup(fd0); // Redirection de l'entrée standard
execvpe(arg1, options, env);
erreur("execvpe n'a pas fonctionné");
exit(EXIT_FAILURE);
}
else
{
waitpid(pid, &status, 0 );
if(status != 0)
erreur("Soucis avec le fils");
}
}
}
@ -62,12 +91,12 @@ void execution(char *arg1, char *arg2, char *arg3)
{
if((pid = fork()) == 0)
{
execv(arg1, NULL);
execvpe(arg1, options, env);
erreur("Soucis au niveau du exec");
exit(-2);
exit(EXIT_FAILURE);
}
else
waitpid(pid);
waitpid(pid, &status, 0);
}
}
void changeDirectory(char * path)
@ -79,6 +108,8 @@ void changeDirectory(char * path)
}
else
{
DIR * repertoire = opendir(path); // A REPRENDRE
struct dirent rep = readdir(repertoire);
if(chdir(path) != 0)
erreur("Impossible de changer de répertoire");
else
@ -144,13 +175,29 @@ int subString (const char *chaine, int debut, int fin, char *result)
memcpy (result, (char *)chaine+debut, fin+1-debut);
return (fin+1-debut);
}
void executionArrierePlan(char *arg1)
void executionArrierePlan(char *arg1, char **env)
{
int pid;
int pipefd[2];
pipe(pipefd);
if((pid = fork()) == 0)
{
int pipefd[2];
pipe(pipefd);
int fd0, fd2;
if((fd0 = open("/dev/null", O_RDONLY)) == -1)
{
erreur("Ouverture fichier null");
exit(EXIT_FAILURE);
}
if((fd2 = open("nohup.err", O_WRONLY | O_CREAT | O_TRUNC, 0666)) == -1 )
{
erreur("Ouverture fichier nohup.err");
exit(EXIT_FAILURE);
}
close(0); dup(fd0);
close(2); dup(fd2);
if((pid = fork()) == 0)
{
close(pipefd[1]);
@ -158,7 +205,7 @@ void executionArrierePlan(char *arg1)
if((fd0 = open("/dev/null", O_RDONLY)) == -1)
{
erreur("Ouverture fichier null");
exit(-2);
exit(EXIT_FAILURE);
}
exit(0);
}