On Tue, 2011-11-01 at 11:49:48 +0100, Svante Signell wrote:
> In package uptimed-0.3.16 the following function is defined:
> void bg(void)
> {
[...]
> /* Close probably all file descriptors */
> for (i = 0; i<NOFILE; i++)
> close(i);
[...]
> }
> Two questions arrives after discussing with braunr on IRC:
>
> 1) Can bg() safely be replaced with daemon()? It is not yet in any posix
> standard.
I don't think daemon() is portable enough, Solaris for example does
not have it.
> 2) If not, what to replace NOFILE with in the code for bg()?
> NOFILE is defined for Linux in /usr/include/sys/param.h but is not
> recommended:
> /* The following are not really correct but it is a value we used for a
> long time and which seems to be usable. People should not use NOFILE
> and NCARGS anyway. */
> #define NOFILE 256
The code is trying to close all possible open descriptors, to get the
actual max number, you can either use getdtablesize() or
sysconf(_SC_OPEN_MAX), depending on the first being available or not.
regards,
guillem
