I'm making a program that search files and sends it's results to other commands, like a pipe. ls | sort When I run the program nothing happens.The problem I think is that the child's waits for the parent to stop writting in the SO buffer for starting the reading. This is what it sends to stdout and what the pipe should send to the other command.
troneras@troneras-VirtualBox:~/Escritorio/busca.2012$ ./busca . -n . -print
./permisos.txt
./busca2.c
./mmap.pdf
./busca3.c~
./cuadernoso4.2011b.pdf
./busca.c~
./busca.c
./busca2.c~
./busca3.c
I don't understand what the problem is.
if(!strcmp(argv[4],"-pipe"))
{
int pipefd[2];
int pid,dummi;
if (pipe(pipefd)<0){
perror("pipe");
exit(1);
}
pid = fork();
if (pid<0){
perror("fork");
exit(1);
}
if (pid == 0){//Child process
close(pipefd[1]);//The child is only reading from the pipe
if(dup2(pipefd[0],0)!=0){perror("dup2");exit(1);}
close(pipefd[0]);
char *argumentos[argc-4];
int j;
for (j=5;j<argc;j++){
argumentos[j-5]=argv[j];
}
argumentos[j-5]= NULL;
execvp(argv[5],argumentos);
perror("execve: ");
}else{ //parent
close(pipefd[0]);
if(dup2(pipefd[1],1)!=1){perror("dup2");exit(1);}
close(pipefd[1]);
while(count--){
if(strcmp(files[count]->d_name,".") && strcmp(files[count]->d_name,"..")){
printf("%s/%s\n",argv[1],files[count]->d_name);
free(files[count]);
}
wait(&dummi);
}
}//end pipe
free(files);
BTW There is no reason to duplicate the argv[] array. Instead of
char *argumentos[argc-4];
int j;
for (j=5;j<argc;j++){
argumentos[j-5]=argv[j];
}
argumentos[j-5]= NULL;
execvp(argv[5],argumentos);
You could just as well do
execvp(argv[5],argv+5);
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