very cool stuff. testing on Blackfin shows much better behavior than current vanilla strace.
this simple test script:
#!/bin/sh
true
false
cat /etc/inittab > /dev/null
exit 0
run like so:
strace -f sh /test.sh
i'm not sure if this is a Blackfin thing, but the first arg to execve() isnt
decoded correctly. also, the forked programs hit the PANIC code instead of
decoding the exit ? for example, the above strace shows:
...
read(3, "#!/bin/sh\ntrue\nfalse\ncat /etc/in"..., 256) = 57
vfork(Process 228 attached
<unfinished ...>
[pid 228] mmap2(NULL, 4095, PROT_READ|PROT_WRITE, MAP_SHARED|MAP_ANONYMOUS,
-1, 0) = 0x27f6000
[pid 228] execve("/bin/trh", ["true"], [/* 4 vars */] <unfinished ...>
[pid 227] <... vfork resumed> ) = 228
[pid 227] wait4(-1, Process 227 suspended
<unfinished ...>
[pid 228] <... execve resumed> ) = 0
[pid 228] execve(NULL, [0x2a0e520], [/* 0 vars */]) = 0
[pid 228] mmap2(0x206d000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|
MAP_ANONYMOUS|0x4000000, -1, 0) = 0x2c84600
[pid 228] stat(NULL, {st_mode=S_IFREG|0644, st_size=959, ...}) = 46679552
[pid 228] open(0x3, O_RDONLY) = 0
[pid 228] mmap2(0x27e0000, 959, PROT_READ, MAP_PRIVATE, 3, 0) = 0x3
[pid 228] close(0) = 41812877
[pid 228] open(0x3, O_RDONLY) = 3
[pid 228] fstat(0, {st_mode=S_IFREG|0755, st_size=229660, ...}) = 0
[pid 228] mmap2(0x27e1000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|
MAP_ANONYMOUS|0x4000000, -1, 0) = 0x3
[pid 228] read(4096, "", 4096) = 0
[pid 228] mmap2(0x2cc0000, 221828, PROT_READ|PROT_EXEC, MAP_PRIVATE|
MAP_DENYWRITE|MAP_EXECUTABLE, 3, 0) = 0
[pid 228] mmap2(0x2a50000, 15544, PROT_READ|PROT_WRITE, MAP_PRIVATE|
MAP_ANONYMOUS, -1, 0) = 0x3
[pid 228] pread(7028, "ECT", 7028, 949978046398464) = 3
[pid 228] close(0) = 41816064
[pid 228] munmap(0, 4096) = 41811968
[pid 228] munmap(0, 959) = 34001760
[pid 228] stat(NULL, {st_mode=S_IFREG|0755, st_size=20260, ...}) = 0
[pid 228] ioctl(0, SNDCTL_TMR_TIMEBASE or SNDRV_TIMER_IOCTL_NEXT_DEVICE or
TCGETS, {B57600 opost isig icanon echo ...}) = 1
[pid 228] ioctl(0, SNDCTL_TMR_TIMEBASE or SNDRV_TIMER_IOCTL_NEXT_DEVICE or
TCGETS, {B57600 opost isig icanon echo ...}) = 46923685
[pid 228] getuid32() = 0
PANIC: attached pid 228 exited with 0
Process 227 resumed
<... wait4 resumed> [{WIFEXITED(s) && WEXITSTATUS(s) == 0}], WSTOPPED, NULL) =
228
--- SIGCHLD (Child exited) @ 0 (0) ---
rt_sigtimedwait([QUIT], NULL, {0, 0}, 8) = -1 EAGAIN (Resource temporarily
unavailable)
wait4(-1, 0x2b3fc94, WNOHANG|WSTOPPED, NULL) = -1 ECHILD (No child processes)
...
everything here looks fine except for the first execve() and that PANIC: ...
the second execve() where it shows NULL i think is a Blackfin thing as it is
trying to decode the args at the exit point of execve() ...
-mike
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