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Will have to debug clients[i]->error and waitpid()

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This commit is contained in:
ha7ilm 2015-11-06 10:45:43 +01:00
parent 37555f2a77
commit 7bae8b1ad8
2 changed files with 51 additions and 5 deletions
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51
ddcd.cpp
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@ -39,6 +39,7 @@ char host_address[100] = "127.0.0.1";
int decimation = 0;
int bufsize = 1024;
int bufsizeall;
int pipe_max_size;
char* buf;
int set_nonblocking(int fd)
@ -137,6 +138,22 @@ int main(int argc, char* argv[])
FD_SET(STDIN_FILENO, &select_fds);
int highfd = ((listen_socket>STDIN_FILENO)?listen_socket:STDIN_FILENO) + 1;
FILE* tempfile = fopen("/proc/sys/fs/pipe-max-size","r");
if(!tempfile)
{
perror(MSG_START "cannot read /proc/sys/fs/pipe-max-size");
}
else
{
char pipe_max_size_str[100];
int tfread = fread(pipe_max_size_str, 1, 100, tempfile);
pipe_max_size_str[tfread]='\0';
pipe_max_size = atoi(pipe_max_size_str);
//fprintf(stderr, MSG_START "note: pipe_max_size = %d\n", pipe_max_size);
//if(pipe_max_size>4096 && fcntl(STDIN_FILENO, F_SETPIPE_SZ, pipe_max_size)==-1)
// perror("failed to fcntl(STDIN_FILENO, F_SETPIPE_SZ, ...)");
}
for(;;)
{
//Let's wait until there is any new data to read, or any new connection!
@ -146,6 +163,7 @@ int main(int argc, char* argv[])
if( (new_socket = accept(listen_socket, (struct sockaddr*)&addr_cli, &addr_cli_len)) != -1)
{
this_client = new client_t;
this_client->error = 0;
memcpy(&this_client->addr, &addr_cli, sizeof(this_client->addr));
this_client->socket = new_socket;
if(pipe(this_client->pipefd) == -1)
@ -153,6 +171,8 @@ int main(int argc, char* argv[])
perror(MSG_START "cannot open new pipe() for the client.\n");
continue;
}
if(fcntl(this_client->pipefd[1], F_SETPIPE_SZ, pipe_max_size) == -1)
perror("failed to F_SETPIPE_SZ for the client pipe!");
if(this_client->pid = fork())
{
//We're the parent
@ -178,11 +198,30 @@ int main(int argc, char* argv[])
for (int i=0; i<clients.size(); i++)
{
if(write(clients[i]->pipefd[1], buf, retval)==-1)
print_client(clients[i], "lost buffer, failed to write pipe");
{
if(!clients[i]->error) print_client(clients[i], "lost buffer, failed to write pipe");
else clients[i]->error=1;
//fprintf(stderr, MSG_START "errno is %d\n", errno); //usually 11
int wpstatus;
int wpresult = waitpid(clients[i]->pid, &wpstatus, WNOHANG);
if(wpresult == -1) print_client(clients[i], "error while waitpid()!");
else if(wpresult == 0)
{
//Client exited!
print_client(clients[i], "closing client from main process.");
close(clients[i]->pipefd[1]);
close(clients[i]->socket);
delete clients[i];
clients.erase(clients.begin()+i);
print_client(clients[i], "okay.");
}
}
else clients[i]->error=0;
}
}
//TODO: at the end, server closes pipefd[1] for client
//close(this_client->pipefd[1]);
//
}
return 0;
@ -200,11 +239,15 @@ void client_cleanup()
void client()
{
printf("I'm the client\n");
fprintf(stderr, "I'm the client\n");
for(;;)
{
read(this_client->pipefd[0],buf,bufsizeall);
send(this_client->socket,buf,bufsizeall,0);
if(send(this_client->socket,buf,bufsizeall,0)==-1)
{
print_client(this_client, "closing.");
exit(0);
}
}
}

3
ddcd.h
View file

@ -13,6 +13,8 @@
#include <vector>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/wait.h>
typedef struct client_s
{
@ -20,6 +22,7 @@ typedef struct client_s
int socket;
pid_t pid;
int pipefd[2];
int error;
} client_t;