Prasanta Sadhukhan wrote: > I was trying to use the message queue implementation of linux through a > simple client/server program. > The client will get text from stdin and send to server through message > queue and server will convert to upper case and resend to back to client > Attached is the client and server program I used > However, while sending in client and receiving in server, I am getting > errno as 13(EACCESS). Can anyone tell me what I need to do extra? For a start, the side which creates the message queue (probably the server) needs to set the permissions, e.g.: #include <sys/stat.h> ... toinput_id=msgget(key_out, IPC_CREAT|S_IRUSR|S_IWUSR); ... tooutput_id=msgget(key_in, IPC_CREAT|S_IRUSR|S_IWUSR); Otherwise, access will be refused, hence EACCESS. Some other issues: The third argument to msgrcv() needs to be the size of the buffer, e.g. sizeof(text) not strlen(text). The return value from main should be non-negative, zero for success and greater than zero for failure. In practice, a value of -1 will typically result in an exit code of 255 due to being truncated to 8 bits. -- Glynn Clements <glynn@xxxxxxxxxxxxxxxxxx> - To unsubscribe from this list: send the line "unsubscribe linux-c-programming" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
