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some-usable-scripts
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mini_shell understand pipe command

master
Philippe Pittoli 2011-02-13 04:02:10 +01:00
parent 822d1ecd3e
commit 894f44e4ca
1 changed files with 27 additions and 32 deletions
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59
mini_shell.c
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@ -14,7 +14,7 @@ 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, char **env); void executionPipe(char *arg1, char * arg3, char **env);
void execution(char *arg1, char *arg2, char *arg3, char **env); void execution(char *arg1, char *arg2, char *arg3, char **env);
void quitter(int signal); void quitter(int signal);
@ -66,8 +66,8 @@ void execution(char *arg1, char *arg2, char *arg3, char **env)
if(arg2 != NULL) if(arg2 != NULL)
{ {
if(strcmp(arg2, "&") == 0) if(strcmp(arg2, "|") == 0)
executionArrierePlan(arg1, env); executionPipe(arg1, arg3, env);
else else
{ {
if((pid = fork()) == 0) if((pid = fork()) == 0)
@ -132,7 +132,7 @@ void changeDirectory(char * path)
if(chdir(path) != 0) if(chdir(path) != 0)
erreur("Impossible de changer de répertoire"); erreur("Impossible de changer de répertoire");
else else
setenv("PWD", path, 1); setenv("PWD",path, 1);
} }
} }
void lire(char** arg1, char** arg2, char** arg3) void lire(char** arg1, char** arg2, char** arg3)
@ -194,47 +194,42 @@ 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, char **env) void executionPipe(char *arg1, char *arg3, char **env)
{ {
int pid; int pid, status;
if((pid = fork()) == 0) if((pid = fork()) == 0)
{ {
int pipefd[2]; int pipefd[2];
pipe(pipefd); pipe(pipefd);
int fd0, fd2; int fd0, fd2, pid;
FILE * fd00, *fd01, *fd02;
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); char ** options = malloc(sizeof(char *)*3);
close(2); dup(fd2); options[0] = arg1;
options[1] = NULL;
if((pid = fork()) == 0) if((pid = fork()) == 0) // Dans le fils : exécution de la première commande
{
close(pipefd[1]);
int temp, fd00, fd01, fd02, pid;
if((fd00 = open("/dev/null", O_RDONLY)) == -1)
{
erreur("Ouverture fichier null");
exit(EXIT_FAILURE);
}
exit(EXIT_SUCCESS);
}
else
{ {
close(pipefd[0]); close(pipefd[0]);
close(1); dup(pipefd[1]);
execvpe(arg1, options, env);
erreur("Soucis avec le exec, option 'PIPE'");
exit(EXIT_FAILURE);
}
else // Le père récupère en entrée la sortie du fils
{
close(pipefd[1]);
close(0); dup(pipefd[0]);
execvpe(arg3, options, env);
erreur("Soucis avec le exec, option 'PIPE'");
exit(EXIT_FAILURE);
} }
} }
else else
{ {
waitpid(pid, &status, 0);
} }
} }
void quitter(int signal) void quitter(int signal)