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| #include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <memory.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
/*
PARENT_READ pfd_c2p[2*i]
CHILD_WRITE pfd_c2p[1+2*i]
CHILD_READ pfd_p2c[2*i]
PARENT_WRITE pfd_p2c[1+2*i]
*/
static int
readcfg_file (char ***cmd, char ***parms)
{
/* mode debug */
return 3;
}
static int
my_read (int fd, char *outbuff, int maxlen)
{
int i,ret=1;
for (i = 0; i < maxlen && outbuff[i - 1] != '\n' && ret > 0; i++)
{
//ici rien n'est lut. (test avec printf)
ret = read (fd, &outbuff[i], 1);
}
return i;
}
int
main (int argc, char **argv)
{
int *pfd_c2p = NULL;
int *pfd_p2c = NULL;
pid_t *pid = NULL;
char **parms = NULL, **cmd = NULL;
int n, i, nbytes, ret;
char inbuff[10000];
char outbuff[10000];
//read the config file
fprintf (stdout, "reading cfg_file !\n");
n = readcfg_file (&cmd, &parms);
if (n > 0)
{
//allocate
pfd_c2p = malloc (2 * n * sizeof (int));
pfd_p2c = malloc (2 * n * sizeof (int));
pid = malloc (n * sizeof (pid_t));
if ((pid == NULL) || (pfd_c2p == NULL) || (pfd_p2c == NULL))
{
perror ("malloc");
return EXIT_FAILURE;
}
}
//create the pipes
for (i = 0; i < n; i++)
{
ret = pipe (&pfd_c2p[2 * i]);
if (ret == -1)
{
perror ("pipe c2p");
return EXIT_FAILURE;
}
ret = pipe (&pfd_p2c[2 * i]);
if (ret == -1)
{
perror ("pipe p2c");
return EXIT_FAILURE;
}
}
//spawn the processes !
fprintf (stdout, "spawning processes\n");
for (i = 0; i < n; i++)
{
pid[i] = fork ();
if (pid[i] == 0) //fils
{
close (pfd_p2c[1 + 2 * i]);
close (pfd_c2p[2 * i]);
dup2 (pfd_p2c[2 * i], STDIN_FILENO);
close (pfd_p2c[2 * i]);
dup2 (pfd_c2p[1 + 2 * i], STDOUT_FILENO);
close (pfd_c2p[1 + 2 * i]);
//execv (cmd[i],parms[i]);
fprintf (stderr, "launching command !\n");
//execlp ("ls", "ls", (char *) 0);
execv ("test-chain-red", NULL);
fprintf (stderr, "erreur execv pour le processus %d:%s %s\n", i,
parms[i], cmd[i]);
return EXIT_FAILURE;
}
else if (pid[i] > 0) //pere
{
close (pfd_p2c[2 * i]);
close (pfd_c2p[1 + 2 * i]);
}
else
{
perror ("fork");
}
} //for
//process the requets
fprintf (stdout, "processing requests\n");
fprintf (stdout, "input now!\n");
while (fgets (inbuff, 10000, stdin) != NULL)
{
for (i = 0; i < n; i++)
{
fprintf (stdout, "writing pipe:%d\n", i);
nbytes = write (pfd_p2c[1 + 2 * i], inbuff, strlen (inbuff));
if (nbytes > 0)
{
fprintf (stdout, "reading pipe:%d\n", i);
//------!!!!---le prog reste "coincé" dans la fonction my_read-------!!!!!!---
nbytes = my_read (pfd_c2p[2 * i], outbuff, sizeof (outbuff)-1);
if (nbytes > 0)
{
fprintf (stdout, "out: <%s>\n", outbuff);
}
else
{
perror ("read");
return EXIT_FAILURE;
}
}
else
{
perror ("write");
return EXIT_FAILURE;
}
} //for
} //while fgets
return EXIT_SUCCESS;
} |
Communication entre plusieurs applications.
(malgres que tout les programmes soit open source)
(si vous voyez d'autres choses ... meme qui ne soit pas relatives au sujet, n'hesitez surtout pas !)
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