Compiling your receiver program generated these warnings on my platform:
These warnings are nothing to sneeze at. The first two in particular are for these lines:
This does not do what you think they do! Adding the line
shows
Operators in C can't convert anything except atomic types, which strings aren't; as far as C's concerned strings are just arrays and pointers. What you're getting is the memory address the string is stored in. It may not have generated a warning for your platform, if pointers and integers are the same size on it(i.e. 32-bit. I'm running 64-bit.)
You need to use a library function to convert them from strings. A quick-and-dirty fix would be to use atoi(argv[1]) and atoi(argv[2]) instead. These need you to include stdlib.h.
The last warning says the function exit() has no prototype, because it needs stdlib.h too. Best not to ignore those warnings since they can cause crashes in some circumstances.
When I am using msgrcv to get a message from a queue, in case of msgsnd some error, the msgrcv thread will waiting forever.
Is there some way that I can specify a time out value for this queue ? just let msgrcv wait for some time, if no message comes during this time slot, msgrcv just return... (3 Replies)
Hi All,
Please guide me how to get rid :
msgrcv : Invalid argument.
I am using message queues: msgsnd and msgrcv,
I am able to send through msgsnd and receive through msgrcv, but at times i get the belo error.
msgrcv : Invalid argument. (1 Reply)
Hi All,
I have a piece of code like blow. It is working fine with AIX 5.3 SP3. When the same thing is getting executed in AIX 5. SP6 it is giving segmentation fault. If I put debug statements before and after, it works fine.
rc = msgrcv(mqid, &msg, size, HIGH_PRIORITY_FIRST , 0)
... (0 Replies)
HI,
When i am configuring php in SUN Solaris. I am getting the below error.
configure: error: Your system seems to lack POSIX threads.
Do i need to install POSIX? If so can somebody let me know where can i download POSIX for Solaris 8?
Thanks, (2 Replies)
Hi everybody,
i couldn't think of any better place to ask this question.
Does LINUX totally confirm with ALL of the POSIX standards??. If not which areas does it diverge??
my apologies if this questions seems sooo stupid to some of you..
thanks (0 Replies)
Hi everybody,
this is the situation. there is a programm XYZ which opens a message queue with the key 47110815 and waits for a SIGUSR1. After receiving this signal it sends a message with type 100 and a number (as ASCII) in the message-body.
I have to write a prog which frist sends the... (1 Reply)
Hi ,
I am using UNIX network programming Vol1 (by R Stevens) book to learn about IPC.
I would be using HP-UX,Solaris and Linux at my work.
I have sections for POSIX and for System V in that book.
I am quite confused in indentifying those OSs as POSIX or SYstem V.
Can anyone please... (1 Reply)
I want to create a program that creates 2 child process, and each of them creates 2 threads, and each thread prints its thread id. I0ve allread done that the outuput isn't the outuput i want.
When a run the following comand "$./a.out | sort -u | wc -l" I have the folowing output
2
$:
It should... (3 Replies)
Hi, I am trying to send/receive data by message queue and expecting it to be blocked on send/read for other side (at least this is my understooding ) , I am connecting message between perl<->C , perl is working as expected , but in C msgsnd and msgrcv are not waiting (blocked) untill second side... (6 Replies)