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commit 691430206f1104b752b0e52386f317e639137788
Author: Jan Chaloupka <jch...@re...>
Date:   Mon Sep 15 13:29:39 2014 +0200

    api.c: support for setting multiline values in control files
    
    As of now, libcgroup does not support multiline values setting from configuration files. i.e. values in a form:
    
    net_prio.ifpriomap="lo 7
    eth0 66
    eth1 5
    eth2 4
    eth3 3";
    
    Thus, setting of more network interfaces can not be done from configuration file. Or
    
    devices.allow="a *:* w
    c 8:* r";
    
    thus setting list of allow devices can not be set as well. The only way is to set it from userspace, e.g.:
    # echo "lo 7" > /sys/fs/cgroup/net_prio/testGroup/net_prio.ifpriomap
    # echo "eth 0" > /sys/fs/cgroup/net_prio/testGroup/net_prio.ifpriomap
    # echo "eth 1" > /sys/fs/cgroup/net_prio/testGroup/net_prio.ifpriomap
    # echo "eth 2" > /sys/fs/cgroup/net_prio/testGroup/net_prio.ifpriomap
    # echo "eth 3" > /sys/fs/cgroup/net_prio/testGroup/net_prio.ifpriomap
    
    This patch allows setting of multiline variables.
    
    How this support works:
    Multiline value is broken in lines and each line is set by write (man 2 write) syscall (without bufferring).
    This implies change of fopen with open, fclose with close.
    There is no control on multiline value, thus "eth0\n  \t\n" can be set. However, setting
    of "  \t" will fail as write command returns -1. Thus administrator has to set correct
    multiline values.
    
    Tested on virtual machine with fedora and rhel with network interface lo, eth0-eth3. Configuration file:
    
    # cat /etc/cgconfig.conf
    group testGroup {
            net_prio {
                    net_prio.ifpriomap="lo 7
    eth0    66
    eth1 5
    eth2 4
    eth3 3";
            }
    }
    
    net_prio has to be created before:
    # modprobe netprio_cgroup
    # mkdir /sys/fs/cgroup/net_prio
    # mount -t cgroup -onet_prio none /sys/fs/cgroup/net_prio
    
    Changelog:
    	test of success of strdup call
    	free str_val before return (str_val is changing in while cycle,
    		thus str_start_val points to the start of str_val before while)
    
    Signed-off-by: Jan Chaloupka <jch...@re...>

-----------------------------------------------------------------------

Summary of changes:
 src/api.c |   50 ++++++++++++++++++++++++++++++++++++++++++++------
 1 files changed, 44 insertions(+), 6 deletions(-)


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