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cfile-iofifomkfifo

Having a trouble with opening FIFO in C

I'm having a trouble in opening FIFOs in C.. first I created them using mkfifo() function with permission : 0777, and when I tried to open them, it succeeded in opening the first FIFO only, then the process will stuck in opening the second FIFO, and this is my code :

fd1 = open("FIFO1_PATH", O_WRONLY );
fd2 = open("FIFO2_PATH", O_WRONLY );

This will not be executed, but once I comment the second line, it executes ! Is there a limit for the number of opening FIFOs per process ? I don't know why is this happening.. I just spent 3 Hours trying to figure out what the problem is, but without any results :(

Solution

  • To answer you question about limits - default in Linux is 1024 file descriptors for a process. Your problem is probably not opening the second FIFO for reading so open for writing blocks.