Seems like if I run a command that gives output, and I try to send
that output to /dev/null, it hangs the command. This occurs with at
least "set" and "setw" commands. I'm running tmux v1.4. I'm not sure
if the following output will help, but thought I'd include it anyways.
Example:
$ tmux setw mode-keys vi >/dev/null
$ tmux set mouse-select-pane on >/dev/null
Upon running strace on the command, where it stops is an event poll on fd 3.
$ strace -f setw mode-keys vi >/dev/null
<snip>
epoll_ctl(3, EPOLL_CTL_ADD, 6, {EPOLLIN|EPOLLOUT, {u32=6, u64=6}}) = 0
epoll_wait(3, {{EPOLLOUT, {u32=6, u64=6}}}, 32, 4294967295) = 1
clock_gettime(CLOCK_MONOTONIC, {6320894, 944207637}) = 0
epoll_ctl(3, EPOLL_CTL_DEL, 6, {EPOLLIN|EPOLLOUT, {u32=6, u64=6}}) = 0
sendmsg(6, {msg_name(0)=NULL,
msg_iov(1)=[{"\0\0\0\0\34\10\0\0\6\0\0\0\377\377\377\377,a\0\0\0\0\0\0\3\0\0\0setw"...,
2076}], msg_controllen=0, msg_flags=0}, 0) = 2076
epoll_ctl(3, EPOLL_CTL_ADD, 6, {EPOLLIN, {u32=6, u64=6}}) = 0
epoll_wait(3,
$ lsof -p 27629
COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME
tmux 27629 mbm cwd DIR 253,6 4096 313345 /home/mbm
tmux 27629 mbm rtd DIR 253,0 4096 2 /
tmux 27629 mbm txt REG 253,3 472881 196646
/usr/local/bin/tmux
tmux 27629 mbm mem REG 253,0 139416 31750
/lib64/ld-2.5.so
tmux 27629 mbm mem REG 253,0 1718120 31757
/lib64/libc-2.5.so
tmux 27629 mbm mem REG 253,0 23360 31773
/lib64/libdl-2.5.so
tmux 27629 mbm mem REG 253,0 145824 31765
/lib64/libpthread-2.5.so
tmux 27629 mbm mem REG 253,0 18152 32080
/lib64/libutil-2.5.so
tmux 27629 mbm mem REG 253,0 114352 32067
/lib64/libnsl-2.5.so
tmux 27629 mbm mem REG 253,3 380464 1180532
/usr/lib64/libncurses.so.5.5
tmux 27629 mbm mem REG 253,0 92736 31783
/lib64/libresolv-2.5.so
tmux 27629 mbm mem REG 253,3 106696 1182989
/usr/lib64/libevent-1.4.so.2.1.3
tmux 27629 mbm mem REG 253,0 53448 31782
/lib64/librt-2.5.so
tmux 27629 mbm 0u CHR 136,1 3 /dev/pts/1
tmux 27629 mbm 1w CHR 1,3 1910 /dev/null
tmux 27629 mbm 2u CHR 136,1 3 /dev/pts/1
tmux 27629 mbm 3r 0000 0,11 0 44807216 eventpoll
tmux 27629 mbm 4u unix 0xffff810013970440 44807217 socket
tmux 27629 mbm 5u unix 0xffff810013971780 44807218 socket
tmux 27629 mbm 6u unix 0xffff8100139714c0 44807219 socket
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