HI Newbi in Unix (spanish) Post: 302349988

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Top Forums Shell Programming and Scripting HI Newbi in Unix (spanish) Post 302349988 by isnhatar on Wednesday 2nd of September 2009 12:47:07 PM

09-02-2009

Registered User

HI Newbi in Unix (spanish)

Mi idea es crear un peque�a shell...lo que pasa es que cuando ejecuto el siguiente programa va todo bien hasta que me salta el error
perror("Error al ejecutar la funci�n execvp\n");
Entonces la aplicaci�n me entra en un bucle(repitiendo todo el rato el error anterio), como puedo hacer para que eso no pase.

#include <iostream>
#include <unistd.h>
#include <cstring>
#include <sys/wait.h>

using namespace std;

const int MAX_ELEMENTOS=12; //De esta manera limitamos un numero maximo de "comandos", en este caso lo limitamos a 12.

void trocear_linea(char *, char *[]); //Utilizaremos esta funcion para dividir la linea de comandos que nosotros le metemos.

int main()
{
char cadena[100];
char *lista_elementos[MAX_ELEMENTOS];

pid_t pid; //Declaramos la variable pid.

cout<<"PROMPT-MI-SHELL: "; //Este es el mensaje que aparecera al ejecutar el programa, es decir el prompt.
cin.getline(cadena,100); //Leemos el prompt, y lo introducimos en la cadena que luego trocearemos.

trocear_linea(cadena,lista_elementos); //Troceamos la linea de comandos que previamente le hemos introducido.

while (strcmp(lista_elementos[0],"salir")!=0)
{
pid=fork(); //Creamos un proceso hijo.

if(pid==0) //Evaluamos el pid del hijo y entonces ejecutamos el comando.
{
if (execvp(lista_elementos[0], lista_elementos)==-1)
{
perror("Error al ejecutar la funcion execvp\n"); //Este error aparecer� cuando introduzcamos comandos erroneos.

}
}
else
{
wait(NULL); //Si el pid es el del padre, este esperar� hasta que termine el proceso hijo.
cout<<"PROMPT-MI-SHELL: "; //Este es el mensaje que aparecera al ejecutar el programa, es decir el prompt.
cin.getline(cadena,100); //Leemos el prompt, y lo introducimos en la cadena que luego trocearemos.

trocear_linea(cadena,lista_elementos); //Troceamos la linea de comandos que previamente le hemos introducido.

}

}

cout<<"El programa ha terminado";

}

void trocear_linea(char *linea, char *lista_elementos[])
{
char *elemento;
const char DELIMITADOR[]=" \t"; //Espacio en blanco o tabulador.
int num; //N�mero de elementos.

num=0;
while (linea!=NULL && num<MAX_ELEMENTOS)
{
elemento=strsep(&linea,DELIMITADOR);
if (strcmp(elemento,"")!=0)
{
lista_elementos[num]=elemento;
num++;
}
}
lista_elementos[num]=NULL;
}

isnhatar

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truncate

TRUNCATE(1)							   User Commands						       TRUNCATE(1)

NAME

       truncate - shrink or extend the size of a file to the specified size

SYNOPSIS

       truncate OPTION... FILE...

DESCRIPTION

       Shrink or extend the size of each FILE to the specified size

       A FILE argument that does not exist is created.

       If  a  FILE  is	larger than the specified size, the extra data is lost.  If a FILE is shorter, it is extended and the extended part (hole)
       reads as zero bytes.

       Mandatory arguments to long options are mandatory for short options too.

       -c, --no-create
	      do not create any files

       -o, --io-blocks
	      treat SIZE as number of IO blocks instead of bytes

       -r, --reference=RFILE
	      base size on RFILE

       -s, --size=SIZE
	      set or adjust the file size by SIZE bytes

       --help display this help and exit

       --version
	      output version information and exit

       The SIZE argument is an integer and optional unit (example: 10K is 10*1024).  Units are K,M,G,T,P,E,Z,Y (powers of 1024) or KB,MB,... (pow-
       ers of 1000).

       SIZE  may also be prefixed by one of the following modifying characters: '+' extend by, '-' reduce by, '<' at most, '>' at least, '/' round
       down to multiple of, '%' round up to multiple of.

AUTHOR

       Written by Padraig Brady.

REPORTING BUGS

       GNU coreutils online help: <http://www.gnu.org/software/coreutils/>
       Report truncate translation bugs to <http://translationproject.org/team/>

COPYRIGHT

       Copyright (C) 2017 Free Software Foundation, Inc.  License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
       This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to the extent permitted by law.

SEE ALSO

       dd(1), truncate(2), ftruncate(2)

       Full documentation at: <http://www.gnu.org/software/coreutils/truncate>
       or available locally via: info '(coreutils) truncate invocation'

GNU coreutils 8.28						   January 2018 						       TRUNCATE(1)