Minix and system calls!!!help!

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    Minix and system calls!!!help!

    Need some help with minix!!! To put it simple,what i want is,when i execute a system call, me or the OS,to also print a random message followed be the system call's name i just used.
    Any help would be appreciated.

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    You will have to add code in the system call function itself to produce this information. This is implemented in most Unix varieties for the strace command.

    --
    Mats
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    Please don't PM me for help - and no, I don't do help over instant messengers.

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    i need to print the msg with the name of system call ,whatever system call i use.when i typing ls for example with what order this call execute?
    if i want to print just something when a call is executing i can put a printf in exec right?but what about the name of the call?

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    Quote Originally Posted by squeezah View Post
    Need some help with minix!!! To put it simple,what i want is,when i execute a system call, me or the OS,to also print a random message followed be the system call's name i just used.
    Any help would be appreciated.
    Capturing a process's system calls is usually done with ptrace(). I have no idea if Minix has it, but I assume it does.

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    strace doesnt work in minix...

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    Quote Originally Posted by squeezah View Post
    strace doesnt work in minix...
    strace works by using ptrace(). Do you at least have ptrace() on Minix? If not, you'll have to hack the standard library to hook the syscall entry points, which will be a pain.

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    no other way to 'capture' the system call's name??

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    Quote Originally Posted by squeezah View Post
    no other way to 'capture' the system call's name??
    No. I keep suggesting ptrace() and you keep ignoring it for some reason.

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    am not ignoring it how can i use it?

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    Quote Originally Posted by squeezah View Post
    am not ignoring it how can i use it?
    Surely Minix has a manual? It would be far more informative than my random guesses. Googling for "minix ptrace" might be useful.

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    It is, I just did. Not quite as helpful as you'd think, though.
    All the buzzt!
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    i use man ptrace and says
    Note: This manual page has no relation to Minix. Someone who
    knows
    ptrace() has to check, or rewrite, this page. :P

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    Quote Originally Posted by CornedBee View Post
    It is, I just did. Not quite as helpful as you'd think, though.
    Well, Minix is getting old in the tooth. If there's no good manual out there anymore, then the OP will have to resort to random hacking.

    Most UNIX-like operating systems provide equivalent functionality through ptrace(), but the details are all slightly different.

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    Cat without Hat CornedBee's Avatar
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    You could also look at the source of ptrace. I think it's the kernel function do_trace, here:
    https://gforge.cs.vu.nl/plugins/scms...ix&view=markup
    All the buzzt!
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    can i ask something ?maybe is wrong or stupid:P a call is executing through exec right?which is the function that reads from shell and l8r other fuction/call call exec??

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