Hello,
when logging system calls with strace on the process that created the
control socket the following can be seen (when the 2nd ssh on the same
terminal is started):
[select(12, [3 4 8 9], [], NULL, {15, 0}]
) = 1 (in [4], left {11, 431772})
clock_gettime(CLOCK_BOOTTIME, {12450, 924219877}) = 0
accept(4, {sa_family=AF_LOCAL, NULL}, [2]) = 5
getsockopt(5, SOL_SOCKET, SO_PEERCRED, {pid=26544, uid=1000, gid=1000}, [12]) = 0
getuid() = 1000
fcntl(5, F_SETFD, FD_CLOEXEC) = 0
fcntl(5, F_GETFL) = 0x2 (flags O_RDWR)
fcntl(5, F_SETFL, O_RDWR|O_NONBLOCK) = 0
fcntl(5, F_GETFL) = 0x802 (flags O_RDWR|O_NONBLOCK)
clock_gettime(CLOCK_BOOTTIME, {12450, 924749258}) = 0
clock_gettime(CLOCK_BOOTTIME, {12450, 924807734}) = 0
select(12, [3 4 5 8 9], [5], NULL, {15, 0}) = 2 (in [5], out [5], left {14,
999994})
clock_gettime(CLOCK_BOOTTIME, {12450, 924941979}) = 0
read(5, "\0\0\0\10", 4) = 4
read(5, "\0\0\0\1\0\0\0\4", 8) = 8
write(5, "\0\0\0\10\0\0\0\1\0\0\0\4", 12) = 12
clock_gettime(CLOCK_BOOTTIME, {12450, 925180653}) = 0
clock_gettime(CLOCK_BOOTTIME, {12450, 925235379}) = 0
select(12, [3 4 5 8 9], [], NULL, {15, 0}) = 1 (in [5], left {14, 999994})
clock_gettime(CLOCK_BOOTTIME, {12450, 925360439}) = 0
read(5, "\0\0\0\10", 4) = 4
read(5, "\20\0\0\4\0\0\0\0", 8) = 8
clock_gettime(CLOCK_BOOTTIME, {12450, 925536700}) = 0
clock_gettime(CLOCK_BOOTTIME, {12450, 925590213}) = 0
select(12, [3 4 5 8 9], [5], NULL, {15, 0}) = 1 (out [5], left {14, 999995})
clock_gettime(CLOCK_BOOTTIME, {12450, 925717764}) = 0
write(5, "\0\0\0\f\200\0\0\5\0\0\0\0\0\0ga", 16) = 16
clock_gettime(CLOCK_BOOTTIME, {12450, 925832117}) = 0
clock_gettime(CLOCK_BOOTTIME, {12450, 925885997}) = 0
select(12, [3 4 5 8 9], [], NULL, {15, 0}) = 1 (in [5], left {14, 999995})
clock_gettime(CLOCK_BOOTTIME, {12450, 926010243}) = 0
read(5, "\0\0\0@", 4) = 4
read(5, "\20\0\0\2\0\0\0\1\0\0\0\0\0\0\0\1\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0~"...,
64) = 64
recvmsg(5, {msg_name(0)=NULL, msg_iov(1)=[{"\0", 1}], msg_controllen=24,
{cmsg_len=20, cmsg_level=SOL_SOCKET, cmsg_type=SCM_RIGHTS, {6}}, msg_flags=0},
0) = 1
recvmsg(5, {msg_name(0)=NULL, msg_iov(1)=[{"\0", 1}], msg_controllen=24,
{cmsg_len=20, cmsg_level=SOL_SOCKET, cmsg_type=SCM_RIGHTS, {7}}, msg_flags=0},
0) = 1
recvmsg(5, {msg_name(0)=NULL, msg_iov(1)=[{"\0", 1}], msg_controllen=24,
{cmsg_len=20, cmsg_level=SOL_SOCKET, cmsg_type=SCM_RIGHTS, {12}}, msg_flags=0},
0) = 1
ioctl(6, SNDCTL_TMR_TIMEBASE or SNDRV_TIMER_IOCTL_NEXT_DEVICE or TCGETS,
{B38400 opost isig icanon echo ...}) = 0
ioctl(6, SNDCTL_TMR_TIMEBASE or SNDRV_TIMER_IOCTL_NEXT_DEVICE or TCGETS,
{B38400 opost isig icanon echo ...}) = 0
ioctl(7, SNDCTL_TMR_TIMEBASE or SNDRV_TIMER_IOCTL_NEXT_DEVICE or TCGETS,
{B38400 opost isig icanon echo ...}) = 0
ioctl(12, SNDCTL_TMR_TIMEBASE or SNDRV_TIMER_IOCTL_NEXT_DEVICE or TCGETS,
{B38400 opost isig icanon echo ...}) = 0
fcntl(6, F_SETFD, FD_CLOEXEC) = 0
fcntl(7, F_SETFD, FD_CLOEXEC) = 0
fcntl(12, F_SETFD, FD_CLOEXEC) = 0
clock_gettime(CLOCK_BOOTTIME, {12450, 926826653}) = 0
clock_gettime(CLOCK_BOOTTIME, {12450, 926905547}) = 0
select(13, [3 4 8 9], [3], NULL, {15, 0}) = 1 (out [3], left {14, 999995})
clock_gettime(CLOCK_BOOTTIME, {12450, 927034328}) = 0
write(3, "\0\0\0
\276\263|\344\300\250\304\25\330\325F\2076hL\t\4\241B`\217\271`\357\376\255N\311"...,
44) = 44
clock_gettime(CLOCK_BOOTTIME, {12450, 927205118}) = 0
clock_gettime(CLOCK_BOOTTIME, {12450, 927270057}) = 0
select(13, [3 4 8 9], [], NULL, {15, 0}) = 1 (in [3], left {14, 999995})
clock_gettime(CLOCK_BOOTTIME, {12450, 927408029}) = 0
read(3, "\0\0\0
\357\333\222yS\305js\305\372\273wc\242\32\355A\210\310\315\305\315EHE\306\35\261"...,
8192) = 44
ioctl(6, TIOCGWINSZ, {ws_row=24, ws_col=80, ws_xpixel=0, ws_ypixel=0}) = 0
clock_gettime(CLOCK_BOOTTIME, {12450, 927644303}) = 0
clock_gettime(CLOCK_BOOTTIME, {12450, 927700923}) = 0
select(13, [3 4 5 8 9], [3 5], NULL, {15, 0}) = 2 (out [3 5], left {14, 999994})
clock_gettime(CLOCK_BOOTTIME, {12450, 927830272}) = 0
write(5, "\0\0\0\f\200\0\0\6\0\0\0\1\0\0\0\4", 16) = 16
write(3,
"\0\0\1@\372\241\227{\232\247F\"\211!\364\273\373\265p\272\346\245K\320\325\262Ey\10\322\315\375"...,
436) = 436
clock_gettime(CLOCK_BOOTTIME, {12450, 928059300}) = 0
clock_gettime(CLOCK_BOOTTIME, {12450, 928120850}) = 0
select(13, [3 4 5 8 9], [], NULL, {15, 0}) = 1 (in [3], left {14, 998954})
clock_gettime(CLOCK_BOOTTIME, {12450, 929408518}) = 0
read(3,
"\0\0\0\20\372\347jh\242I\33\233\214\275\261}&4\274\300\207\2209\216\347CD\320\0\0\0\20"...,
8192) = 176
clock_gettime(CLOCK_BOOTTIME, {12450, 929613655}) = 0
clock_gettime(CLOCK_BOOTTIME, {12450, 929675983}) = 0
select(13, [3 4 5 6 8 9], [7], NULL, {15, 0}) = 1 (out [7], left {14, 999991})
clock_gettime(CLOCK_BOOTTIME, {12450, 929828373}) = 0
write(7, "Last login: Thu Jul 30 11:03:05 "..., 54) = 54
clock_gettime(CLOCK_BOOTTIME, {12450, 929950095}) = 0
clock_gettime(CLOCK_BOOTTIME, {12450, 930005636}) = 0
select(13, [3 4 5 6 8 9], [], NULL, {15, 0}) = 1 (in [3], left {14, 727921})
clock_gettime(CLOCK_BOOTTIME, {12451, 202284805}) = 0
read(3,
"\0\0\0000\353\245\246uri\357m\220>\210\244\304\313\354\327R\3535\320\266d\202^:i\221\371"...,
8192) = 60
clock_gettime(CLOCK_BOOTTIME, {12451, 202472937}) = 0
clock_gettime(CLOCK_BOOTTIME, {12451, 202540369}) = 0
select(13, [3 4 5 6 8 9], [7], NULL, {15, 0}) = 1 (out [7], left {14, 999992})
clock_gettime(CLOCK_BOOTTIME, {12451, 202688970}) = 0
write(7, "\33]0;uwe@perseus: ~\7uwe@perseus:~"..., 34) = 34
clock_gettime(CLOCK_BOOTTIME, {12451, 202811407}) = 0
clock_gettime(CLOCK_BOOTTIME, {12451, 202882596}) = 0
select(13, [3 4 5 6 8 9], [], NULL, {15, 0}) = 1 (in [6], left {13, 639311})
clock_gettime(CLOCK_BOOTTIME, {12452, 563761064}) = 0
read(6, 0x7ffdc9f16de0, 16384) = ? ERESTARTSYS (To be restarted if
SA_RESTART is set)
--- SIGTTIN {si_signo=SIGTTIN, si_code=SI_KERNEL} ---
--- stopped by SIGTTIN ---
with fd 6 being the terminal of the process (that is also connected to file
descriptors 0 1 and 2).
Best regards
Uwe
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