Под обычным пользователем:
Что захватил
[pid 2318] writev(7, [{iov_base="\22\0\n\0\3\0\200\4\354\1\0\0\354\1\0\0\10\0\310\0\20\0\0\0l\0\5\0\0\0\0\0"..., iov_len=1124}, {iov_base=NULL, iov_len=0}, {iov_base="", iov_len=0}], 3) = 1124
[pid 2318] recvmsg(7, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
[pid 2318] write(9, "\1\0\0\0\0\0\0\0", 8) = 8
[pid 2318] write(6, "\1\0\0\0\0\0\0\0", 8) = 8
[pid 2318] write(6, "\1\0\0\0\0\0\0\0", 8) = 8
[pid 2318] rt_sigaction(SIGPIPE, {sa_handler=SIG_IGN, sa_mask=[], sa_flags=0}, NULL, 8) = 0
[pid 2318] write(8, "CMD:show;", 9) = 9
[pid 2318] write(3, "[2017.03.09 22:13:53] Show comma"..., 64) = 64
[pid 2318] stat64("/etc/localtime", {st_mode=S_IFREG|0644, st_size=1544, ...}) = 0
[pid 2318] stat64("/etc/localtime", {st_mode=S_IFREG|0644, st_size=1544, ...}) = 0
[pid 2318] stat64("/etc/localtime", {st_mode=S_IFREG|0644, st_size=1544, ...}) = 0
[pid 2318] recvmsg(7, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="\34\0\247\0\3\0\200\4\354\1\0\0+\362.\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., iov_len=4096}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, 0) = 512
[pid 2318] recvmsg(7, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
[pid 2318] poll([{fd=6, events=POLLIN}, {fd=7, events=POLLIN}, {fd=8, events=POLLIN}], 3, 0) = 1 ([{fd=6, revents=POLLIN}])
[pid 2318] read(6, "\2\0\0\0\0\0\0\0", 16) = 8
[pid 2318] recvmsg(7, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
[pid 2318] recvmsg(7, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
[pid 2318] poll([{fd=6, events=POLLIN}, {fd=7, events=POLLIN}, {fd=8, events=POLLIN}], 3, 0) = 0 (Timeout)
[pid 2318] recvmsg(7, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
[pid 2318] poll([{fd=6, events=POLLIN}, {fd=7, events=POLLIN}, {fd=8, events=POLLIN}], 3, 0) = 0 (Timeout)
[pid 2318] recvmsg(7, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
[pid 2318] poll([{fd=6, events=POLLIN}, {fd=7, events=POLLIN}, {fd=8, events=POLLIN}], 3, 0) = 0 (Timeout)
[pid 2318] recvmsg(7, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
[pid 2318] poll([{fd=6, events=POLLIN}, {fd=7, events=POLLIN}, {fd=8, events=POLLIN}], 3, 0) = 0 (Timeout)
[pid 2318] futex(0xb4e32cc0, FUTEX_WAKE_PRIVATE, 2147483647) = 0
[pid 2318] recvmsg(7, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
[pid 2318] poll([{fd=6, events=POLLIN}, {fd=7, events=POLLIN}, {fd=8, events=POLLIN}], 3, -1 <unfinished ...>
[pid 2320] <... futex resumed> ) = 1
[pid 2320] write(9, "\1\0\0\0\0\0\0\0", 8) = 8
[pid 2320] poll([{fd=9, events=POLLIN}, {fd=10, events=POLLIN}, {fd=11, events=POLLIN}], 3, 0) = 1 ([{fd=9, revents=POLLIN}])
[pid 2320] read(9, "\3\0\0\0\0\0\0\0", 16) = 8
[pid 2320] poll([{fd=9, events=POLLIN}, {fd=10, events=POLLIN}, {fd=11, events=POLLIN}], 3, -1 <unfinished ...>
[pid 2319] <... poll resumed> ) = 1 ([{fd=4, revents=POLLIN}])
[pid 2319] recvmsg(4, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="U\2\223\1l\32/\0\3\4\4\0\0\0\0\0\0\0\0\4\4\4\4\4\0\0\3\37%\2\0\0", iov_len=4096}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, 0) = 32
[pid 2319] write(6, "\1\0\0\0\0\0\0\0", 8 <unfinished ...>
[pid 2318] <... poll resumed> ) = 1 ([{fd=6, revents=POLLIN}])
[pid 2319] <... write resumed> ) = 8
[pid 2318] read(6, <unfinished ...>
[pid 2319] poll([{fd=4, events=POLLIN}], 1, -1 <unfinished ...>
[pid 2318] <... read resumed> "\1\0\0\0\0\0\0\0", 16) = 8
[pid 2318] recvmsg(7, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
[pid 2318] poll([{fd=6, events=POLLIN}, {fd=7, events=POLLIN}, {fd=8, events=POLLIN}], 3, -1^Z
