Hello,
thanks a lot, Sunday is never a good day for working, what a mistake :-) !
___________
From: Pawan Prakash Sharma [pawanprakash101 at gmail.com]
Sent: 25 May 2014 15:19
To: Pietro Paolini
Cc: kernelnewbies at kernelnewbies.org
Subject: Re: mmap(): enodev
Hi Pietro,
Following line is buggy one
if ((fd = open(FILENAME, O_RDWR) == -1)) <--- here fd will have
Boolean value only
it should be
if ((fd = open(FILENAME, O_RDWR)) == -1)
Check the operator precedence for more clarification. Also I hope the
file you are opening already exists.
Regards,
-Pawan
On Sun, May 25, 2014 at 6:16 PM, Pietro Paolini <P.Paolini at genexis.eu> wrote:
> Hello everyone,
> in order to try to use mmap() to perform IPC I am writing a test program like this :
>
> int main(char **argv, int argn)
> {
> char *addr;
> int fd;
>
> if ((fd = open(FILENAME, O_RDWR) == -1)) {
> perror("open:");
> exit(1);
> }
> addr = mmap(NULL, SIZE, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
> if (addr == MAP_FAILED) {
> printf("mmap() : %p %s", addr, strerror(errno));
> exit(1);
> }
> close(fd);
> ....
>
>
> I am running under
> Linux crunchbang 3.2.0-4-amd64 #1 SMP Debian 3.2.54-2 x86_64 GNU/Linux
>
> My problem is that everytime I have got an "No such device" error which I don't fully get, could a problem of my platoform
> or am I simply doing something wrong ?
>
> Thanks all,
> Pietro
>
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