In article <20070413161219.GA262083@medusa.sis.pasteur.fr>,
Nicolas Joly  <njoly@pasteur.fr> wrote:
>-=-=-=-=-=-
>
>
>Hi,
>
>I just noticed that tracing syscalls with ptrace(2) & PT_SYSCALL does
>not seems to work as expected ... The debugged process seems only
>stopped after executing a syscall, but not before.
>
>I made the attached code to illustrate that problem (seen on -current
>i386 and amd64). The same program, on FreeBSD/i386 6.1, show 2 ptrace
>calls for each syscall as i expected.
>
>njoly@hal [~]> uname -a
>NetBSD hal.sis.pasteur.fr 4.99.17 NetBSD 4.99.17 (HAL) #2: Wed Apr 11
>15:01:57 CEST 2007 
>njoly@hal.sis.pasteur.fr:/local/src/NetBSD/obj/i386/sys/arch/i386/compile/HAL
>i386
>
>njoly@hal [~]> ./ptrace >/dev/null
>syscall 0x0 (0).
>syscall 0xbbbea000 (-1145135104).
>syscall 0x3 (3).
>syscall 0x0 (0).
>syscall 0xbbbe9000 (-1145139200).
>syscall 0x0 (0).
>syscall 0x0 (0).
>syscall 0x2 (2).
>syscall 0x2 (2).
>syscall 0x2 (2).
>[...]
>njoly@hal [~]> ktrace -di /bin/echo foo
>foo
>njoly@hal [~]> kdump | grep RET
>  7677      1 echo     RET   execve JUSTRETURN
>  7677      1 echo     RET   mmap -1145135104/0xbbbea000
>  7677      1 echo     RET   open 3
>  7677      1 echo     RET   __fstat30 0
>  7677      1 echo     RET   mmap -1145139200/0xbbbe9000
>  7677      1 echo     RET   close 0
>  7677      1 echo     RET   munmap 0
>  7677      1 echo     RET   open -1 errno 2 No such file or directory
>  7677      1 echo     RET   open -1 errno 2 No such file or directory
>  7677      1 echo     RET   open -1 errno 2 No such file or directory
>[...]
>
>Do i miss something ?
>Thanks.

No, seems to have broken after Andy's changes. The calls to stop the
process are still there... Either the flags are not set properly,
or the signal does not trasmitted.

christos