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author | Kay Sievers <kay.sievers@suse.de> | 2005-08-18 13:07:15 +0200 |
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committer | Kay Sievers <kay.sievers@suse.de> | 2005-08-18 13:07:15 +0200 |
commit | 3f9f8de4de49135476644297585bd910b14d0ea7 (patch) | |
tree | 88485093f4fc9df67e444a113f3dc728f4470db7 /udev_config.c | |
parent | e331c54dc58a8228018e1a29e84eff76cd9f8fe1 (diff) |
bring std(in|out|err) fd's in a sane state
If the kernel forks us as an usermodhelper, we don't have any of
the standard fd's and the first open() will start with fd=0.
This is inherited to all forked childs and confuses later forked
helpers where we want to read from a pipe connected to the helpers
stdout/stderr.
# ls -l /proc/$(pidof udevd)/fd
total 6
dr-x------ 2 root root 0 2005-08-18 12:44 .
dr-xr-xr-x 4 root root 0 2005-08-18 12:44 ..
lrwx------ 1 root root 64 2005-08-18 12:44 0 -> /dev/null
lrwx------ 1 root root 64 2005-08-18 12:44 1 -> socket:[1274617]
lr-x------ 1 root root 64 2005-08-18 12:44 2 -> pipe:[1274618]
l-wx------ 1 root root 64 2005-08-18 12:44 3 -> pipe:[1274618]
lrwx------ 1 root root 64 2005-08-18 12:44 4 -> socket:[1274619]
lrwx------ 1 root root 64 2005-08-18 12:44 5 -> socket:[1274620]
Ouch! This will obviously not redirect sterr, it will kill the pipe
we established between the parent and the child:
devnull = open("/dev/null", O_RDWR);
dup2(devnull, STDERR_FILENO);
Signed-off-by: Kay Sievers <kay.sievers@suse.de>
Diffstat (limited to 'udev_config.c')
0 files changed, 0 insertions, 0 deletions