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  • 1 Post By AndiPersti

Return the errno from open func. and print it to screen

This is a discussion on Return the errno from open func. and print it to screen within the C Programming forums, part of the General Programming Boards category; Hi... i am programming Cli/Ser ,so part of the program is to open file to download it from client side,but ...

  1. #1
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    Return the errno from open func. and print it to screen

    Hi...
    i am programming Cli/Ser ,so part of the program is to open file to download it from client side,but i want to return the global value Errorno to print it to screen , and how to use strerror() func ???
    i write this "This is part of server code" :

    Code:
    fd= open("abc.txt",O_RDONLY);
                    //error handilng in open file
                    if(fd<0)
                    {
                        fprintf(stderr,"The Error is : \n");
                        //bzero(&buffer,sizeof(buffer));
                        snprintf(buffer,sizeof(buffer),"%d",fd);
                        n=write(connfd,&buffer,sizeof(buffer));
                        continue;
                    }
    if the fd <0 return error ,i want to know what is the error and print it to screen

    **note :when i use perror() ,the result print to screen like this
    "n success"???
    Last edited by zmhnak; 03-22-2013 at 04:21 AM. Reason: syntax

  2. #2
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    open() doesn't return an error number. It just returns -1 if there is an error. The type of the error is stored in the errno macro which you can use with strerror().

    Bye, Andreas

  3. #3
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    ok i know this my frnd,but give me an example in "code"to illstrate this please? using open func()

  4. #4
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    rags_to_riches likes this.

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