On Tue, Apr 16, 2013 at 7:37 PM, Pavel Emelyanov <xemul@xxxxxxxxxxxxx> wrote: > It was added into Linux v3.3 and provides info about files being mmap-ed in > a way _very_ similar to how /proc/[pid]/fd works. Thus I thought that the > best place for the map_files' doc is where where the fd's doc is. > > v2: Added examples of how links look like and dependency on kernel config > option CONFIG_CHECKPOINT_RESTORE. > > Signed-off-by: Pavel Emelyanov <xemul@xxxxxxxxxxxxx> Thanks Pavel. Applied. Cheers, Michael > --- > > diff --git a/man5/proc.5 b/man5/proc.5 > index 520c5fc..1bfc63c 100644 > --- a/man5/proc.5 > +++ b/man5/proc.5 > @@ -286,6 +286,42 @@ Thus the example command above could be written as: > .RB "$" " foobar \-i /dev/stdin \-o /dev/stdout ..." > .fi > .in > +.TP > +.IR /proc/[pid]/map_files/ " (since kernel 3.3) > +This subdirectory contains entries corresponding to memory mapped > +files (see > +.BR mmap (2)). > +Entries are named by memory region start and end pair, > +and are symbolic links to the files themselves. Like this > +.in +4n > +.nf > + > +.RB "$" " ls -l /proc/self/map_files/" > +lr--------. 1 root root 64 Apr 16 21:31 3252e00000-3252e20000 -> /usr/lib64/ld-2.15.so > +\&... > +.fi > +.in > + > +Although these entries are present for memory regions that were > +mapped with > +.BR MAP_FILE > +flag, the way anonymous shared memory (regions created with > +.B MAP_ANON | MAP_SHARED > +flags) > +is implemented in Linux > +makes such regions also appear on this directory. In that case > +the target file would be the deleted /dev/zero one: > +.in +4n > +.nf > + > +.RB > +lrw-------. 1 root root 64 Apr 16 21:33 7fc075d2f000-7fc075e6f000 -> /dev/zero (deleted) > +.fi > +.in > + > +This directory appears only if the > +.B CONFIG_CHECKPOINT_RESTORE > +kernel configuration option is enabled. > .\" FIXME Describe /proc/[pid]/loginuid > .\" Added in 2.6.11; updating requires CAP_AUDIT_CONTROL > .\" CONFIG_AUDITSYSCALL -- Michael Kerrisk Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/ Author of "The Linux Programming Interface"; http://man7.org/tlpi/ -- 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
