23 lines
929 B
Plaintext
Executable File
23 lines
929 B
Plaintext
Executable File
Even though SVR4 has truss, you may prefer using strace for a number
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of reasons. Not the least of which are portability and source code.
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The main event loop is awkward on systems for which procfs isn't
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pollable. I think a pollable procfs is a Solaris invention so most SVR4
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systems have this weakness. On Solaris, strace runs as a single
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controlling process. This is a big improvement if you are debugging a
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lot of processes at once.
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There is no thread support but it wouldn't be very difficult to add it.
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On UnixWare using the -f option to follow forked children sometimes shows
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many "unfinished" system calls as strace bounces between each runnable child.
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A crude workaround for this is available by adding
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#define POLL_HACK 1
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to the config.h file. This forces strace to check whether the last process
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has finished a system call before polling other processes for events.
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Wichert Akkerman <wakkerma@debian.org>
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