On 05/06/2013 08:14 AM, Kevin Easton wrote: > Hi Michael, > > This patch is against man-pages-3.51. It documents the fact that a > successful execve(2) in a process that is sharing a file descriptor table > results in unsharing the table. > > I discovered this through testing and verified it by source inspection - > there is a call to unshare_files() early in do_execve_common(). Thanks, Kevin. Applied. Cheers, Michael > diff -ur man-pages-3.51.orig/man2/clone.2 man-pages-3.51/man2/clone.2 > --- man-pages-3.51.orig/man2/clone.2 2013-04-19 21:57:19.000000000 +1000 > +++ man-pages-3.51/man2/clone.2 2013-05-06 15:42:06.841539649 +1000 > @@ -206,6 +206,9 @@ > .BR fcntl (2) > .B F_SETFD > operation), the other process is also affected. > +If a process sharing a file descriptor table calls > +.BR execve (2), > +its file descriptor table is duplicated (unshared). > > If > .B CLONE_FILES > Only in man-pages-3.51/man2: clone.2.orig > diff -ur man-pages-3.51.orig/man2/execve.2 man-pages-3.51/man2/execve.2 > --- man-pages-3.51.orig/man2/execve.2 2013-04-19 21:57:19.000000000 +1000 > +++ man-pages-3.51/man2/execve.2 2013-05-06 15:42:06.841539649 +1000 > @@ -204,6 +204,11 @@ > .B SIGCHLD > (see > .BR clone (2)). > +.IP * > +The file descriptor table is unshared, undoing the effect of the > +.B CLONE_FILES > +flag of > +.BR clone (2). > .PP > Note the following further points: > .IP * 3 > > -- Michael Kerrisk Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/ Linux/UNIX System Programming Training: http://man7.org/training/ -- To unsubscribe from this list: send the line "unsubscribe linux-man" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
