Stefan <b...@bc-bd.org> writes:
> Can you strace detach to see where it looks for ptys ?
Sorry, I missed this message.
Here is the output from strace -f
execve("/usr/bin/dtach", ["dtach", "-A", "/tmp/foo", "bash"], [/* 21 vars */])
= 0
brk(0) = 0x19793000
faccessat(AT_FDCWD, "/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or
directory)
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0x7f9388e000
faccessat(AT_FDCWD, "/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or
directory)
openat(AT_FDCWD, "/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=16627, ...}) = 0
mmap(NULL, 16627, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f93889000
close(3) = 0
faccessat(AT_FDCWD, "/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or
directory)
openat(AT_FDCWD, "/lib/aarch64-linux-gnu/libutil.so.1", O_RDONLY|O_CLOEXEC) = 3
read(3,
"\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0\267\0\1\0\0\0\340\17\0\0\0\0\0\0"..., 832)
= 832
fstat(3, {st_mode=S_IFREG|0644, st_size=10600, ...}) = 0
mmap(NULL, 74008, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) =
0x7f93854000
mprotect(0x7f93856000, 61440, PROT_NONE) = 0
mmap(0x7f93865000, 8192, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1000) = 0x7f93865000
close(3) = 0
faccessat(AT_FDCWD, "/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or
directory)
openat(AT_FDCWD, "/lib/aarch64-linux-gnu/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
read(3,
"\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0\267\0\1\0\0\0\254\16\2\0\0\0\0\0"..., 832)
= 832
fstat(3, {st_mode=S_IFREG|0755, st_size=1275584, ...}) = 0
mmap(NULL, 1348472, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) =
0x7f9370a000
mprotect(0x7f9383b000, 61440, PROT_NONE) = 0
mmap(0x7f9384a000, 24576, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x130000) = 0x7f9384a000
mmap(0x7f93850000, 13176, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f93850000
close(3) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0x7f93888000
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0x7f93887000
mprotect(0x7f9384a000, 16384, PROT_READ) = 0
mprotect(0x7f93865000, 4096, PROT_READ) = 0
mprotect(0x7f93892000, 4096, PROT_READ) = 0
munmap(0x7f93889000, 16627) = 0
ioctl(0, TCGETS, {B38400 opost isig icanon echo ...}) = 0
socket(PF_LOCAL, SOCK_STREAM, 0) = 3
connect(3, {sa_family=AF_LOCAL, sun_path="/tmp/foo"}, 110) = -1 ENOENT (No such
file or directory)
close(3) = 0
socket(PF_LOCAL, SOCK_STREAM, 0) = 3
bind(3, {sa_family=AF_LOCAL, sun_path="/tmp/foo"}, 110) = 0
listen(3, 128) = 0
fcntl(3, F_GETFL) = 0x2 (flags O_RDWR)
fcntl(3, F_SETFL, O_RDWR|O_NONBLOCK) = 0
fchmodat(AT_FDCWD, "/tmp/foo", 0600) = 0
fcntl(3, F_SETFD, FD_CLOEXEC) = 0
pipe2([4, 5], 0) = 0
fcntl(4, F_SETFD, FD_CLOEXEC) = 0
fcntl(5, F_SETFD, FD_CLOEXEC) = 0
clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD,
child_tidptr=0x7f938870d0) = 28825
Process 28825 attached
[pid 28824] close(5) = 0
[pid 28825] close(4) = 0
[pid 28824] read(4, <unfinished ...>
[pid 28825] setsid() = 28825
[pid 28825] rt_sigaction(SIGPIPE, {SIG_IGN, [PIPE], SA_RESTART}, {SIG_DFL, [],
0}, 8) = 0
[pid 28825] rt_sigaction(SIGXFSZ, {SIG_IGN, [XFSZ], SA_RESTART}, {SIG_DFL, [],
0}, 8) = 0
[pid 28825] rt_sigaction(SIGHUP, {SIG_IGN, [HUP], SA_RESTART}, {SIG_DFL, [],
0}, 8) = 0
[pid 28825] rt_sigaction(SIGTTIN, {SIG_IGN, [TTIN], SA_RESTART}, {SIG_DFL, [],
0}, 8) = 0
[pid 28825] rt_sigaction(SIGTTOU, {SIG_IGN, [TTOU], SA_RESTART}, {SIG_DFL, [],
0}, 8) = 0
[pid 28825] rt_sigaction(SIGINT, {0x401e74, [INT], SA_RESTART}, {SIG_DFL, [],
0}, 8) = 0
[pid 28825] rt_sigaction(SIGTERM, {0x401e74, [TERM], SA_RESTART}, {SIG_DFL, [],
0}, 8) = 0
[pid 28825] rt_sigaction(SIGCHLD, {0x401e74, [CHLD], SA_RESTART}, {SIG_DFL, [],
0}, 8) = 0
[pid 28825] openat(AT_FDCWD, "/dev/ptmx", O_RDWR) = 4
[pid 28825] statfs("/dev/pts", {f_type="TMPFS_MAGIC", f_bsize=4096,
f_blocks=2560, f_bfree=2560, f_bavail=2560, f_files=2063331, f_ffree=2063053,
f_fsid={0, 0}, f_namelen=255, f_frsize=4096}) = 0
[pid 28825] statfs("/dev/", {f_type="TMPFS_MAGIC", f_bsize=4096, f_blocks=2560,
f_bfree=2560, f_bavail=2560, f_files=2063331, f_ffree=2063053, f_fsid={0, 0},
f_namelen=255, f_frsize=4096}) = 0
[pid 28825] close(4) = 0
[pid 28825] openat(AT_FDCWD, "/dev/ptyp0", O_RDWR) = -1 ENOENT (No such file or
directory)
[pid 28825] dup3(5, 1, 0) = 1
[pid 28825] fstat(1, {st_mode=S_IFIFO|0600, st_size=0, ...}) = 0
[pid 28825] mmap(NULL, 65536, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS,
-1, 0) = 0x7f936fa000
[pid 28825] unlinkat(AT_FDCWD, "/tmp/foo", 0) = 0
[pid 28825] write(1, "dtach: init_pty: No such file or"..., 43) = 43
[pid 28824] <... read resumed> "dtach: init_pty: No such file or"..., 1024) = 43
[pid 28824] write(2, "dtach: init_pty: No such file or"..., 43 <unfinished ...>
[pid 28825] exit_group(1) = ?
dtach: init_pty: No such file or directory
[pid 28824] <... write resumed> ) = 43
[pid 28824] kill(28825, SIGTERM) = 0
[pid 28824] exit_group(1) = ?
[pid 28825] +++ exited with 1 +++
+++ exited with 1 +++
