Hi Paul,
On 10/16/2015 02:37 PM, Paul Fee wrote:
> [Resending, hopefully as plain text this time for the benefit of
> vger.kernel.org]
>
> Hi,
>
> Here's the current text from the socket(2) manpage, ERRORS section:
>
> EMFILE Process file table overflow.
>
> ENFILE The system limit on the total number of open files has been
> reached.
>
> These appear to be the wrong way round. Here's an extract from
> errno-base.h:
>
> #define ENFILE 23 /* File table overflow */
> #define EMFILE 24 /* Too many open files */
>
> In my test program, I see that errno is set to 24, with strerror()
> returning "Too many open files". Therefore the comments in errno-base.h
> look correct and the manpage needs updating.
Well, both the man page and the comments could be better. I changed the
man page to:
EMFILE The per-process limit on the number of open file
descriptors has been reached.
ENFILE The system-wide limit on the total number of open files
has been reached.
EMFILE is caused by encountering the RLIMIT_NOFILE limit (see
getrlimit(2)).
ENFILE is about encountering the /proc/sys/fs/file-max limit
(see proc(5)).
Thanks for the report!
Cheers,
Michael
>
> Test code
> ==========
> #include <sys/socket.h>
> #include <stdio.h>
> #include <errno.h>
> #include <string.h>
>
> int main(int argc, char* argv[])
> {
> while(1)
> {
> int s = socket(AF_UNIX, SOCK_STREAM, 0);
> printf("Created socket, fd: %d\n", s);
> if (-1 == s)
> {
> printf("Error: %d: %s\n", errno, strerror(errno));
> return 1;
> }
> }
> return 0;
> }
> ==========
>
> Thanks,
> Paul
>
--
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
Linux/UNIX System Programming Training: http://man7.org/training/
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