Why do I need to close fds when reading and writing to the pipe?
- by valentimsousa
However, what if one of my processes needs to continuously write to the pipe while the other pipe needs to read?
This example seems to work only for one write and one read. I need multi read and write
void executarComandoURJTAG(int newSock) {
int input[2], output[2], estado, d;
pid_t pid;
char buffer[256];
char linha[1024];
pipe(input);
pipe(output);
pid = fork();
if (pid == 0) {// child
close(0);
close(1);
close(2);
dup2(input[0], 0);
dup2(output[1], 1);
dup2(output[1], 2);
close(input[1]);
close(output[0]);
execlp("jtag", "jtag", NULL);
}
else { // parent
close(input[0]);
close(output[1]);
do {
read(newSock, linha, 1024);
/* Escreve o buffer no pipe */
write(input[1], linha, strlen(linha));
close(input[1]);
while ((d = read(output[0], buffer, 255))) {
//buffer[d] = '\0';
write(newSock, buffer, strlen(buffer));
puts(buffer);
}
write(newSock, "END", 4);
} while (strcmp(linha, "quit") != 0);
}
}
