karchnu
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some-usable-scripts
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master
Philippe Pittoli 2011-02-08 01:07:30 +01:00
parent c4269272ad
commit 6a52773b91
1 changed files with 93 additions and 12 deletions
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105
mini_shell.c
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@ -1,3 +1,6 @@
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h> #include <stdio.h>
#include <assert.h> #include <assert.h>
#include <unistd.h> #include <unistd.h>
@ -9,26 +12,78 @@ char * lireChaine3();
void changeDirectory(char * path); void changeDirectory(char * path);
int subString (const char *chaine, int debut, int fin, char *result); int subString (const char *chaine, int debut, int fin, char *result);
void erreur(char *s); void erreur(char *s);
void executionArrierePlan(char *arg1);
void execution(char *arg1, char *arg2, char *arg3);
int main(int argc, char **argv) int main(int argc, char **argv)
{ {
char **arg1, **arg2, **arg3; int commandeInterne;
lire(arg1, arg2, arg3); char *arg1, *arg2, *arg3;
// Boucle principale qui attend les commandes
if(strcmp(*arg1, "cd") == 0) while(1)
{ {
// On change de répertoire printf("[ %s ] %s $ ",(char *) getenv("USER"), (char *) getenv("PWD"));
changeDirectory(*arg2); arg1 = arg2 = arg3 = NULL;
} commandeInterne = 0;
lire(&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);
}
}
}
void execution(char *arg1, char *arg2, char *arg3)
{
int pid;
if(arg2 != NULL)
{
if(strcmp(arg2, "&") == 0)
executionArrierePlan(arg1);
if(strcmp(arg2, "<") == 0)
{
printf("Commande avec <\n");
}
}
else // exécution basique
{
if((pid = fork()) == 0)
{
execv(arg1, NULL);
erreur("Soucis au niveau du exec");
exit(-2);
}
else
waitpid(pid);
}
} }
void changeDirectory(char * path) void changeDirectory(char * path)
{ {
if(strcmp(path, "") == 0) if(path == NULL || strcmp(path, "") == 0)
{
chdir(getenv("HOME")); chdir(getenv("HOME"));
else if(chdir(path) != 0 ) setenv("PWD", (char *) getenv("HOME"), 1);
erreur("Impossible de changer de répertoire"); }
else
{
if(chdir(path) != 0)
erreur("Impossible de changer de répertoire");
else
setenv("PWD", path, 1);
}
} }
void lire(char** arg1, char** arg2, char** arg3) void lire(char** arg1, char** arg2, char** arg3)
{ {
@ -82,7 +137,6 @@ char *lireChaine3()
void erreur(char *s) void erreur(char *s)
{ {
perror(s); perror(s);
exit(-2);
} }
int subString (const char *chaine, int debut, int fin, char *result) int subString (const char *chaine, int debut, int fin, char *result)
{ {
@ -90,3 +144,30 @@ int subString (const char *chaine, int debut, int fin, char *result)
memcpy (result, (char *)chaine+debut, fin+1-debut); memcpy (result, (char *)chaine+debut, fin+1-debut);
return (fin+1-debut); return (fin+1-debut);
} }
void executionArrierePlan(char *arg1)
{
int pid;
int pipefd[2];
pipe(pipefd);
if((pid = fork()) == 0)
{
if((pid = fork()) == 0)
{
close(pipefd[1]);
int temp, fd0, fd1, fd2, pid;
if((fd0 = open("/dev/null", O_RDONLY)) == -1)
{
erreur("Ouverture fichier null");
exit(-2);
}
exit(0);
}
else
{
close(pipefd[0]);
}
}
else
{
}
}