how to distinguish entry/exit of a syscall when using ptrace?

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LEARN ABOUT SUSE

ausyscall

AUSYSCALL:(8)						  System Administration Utilities					     AUSYSCALL:(8)

NAME

       ausyscall - a program that allows mapping syscall names and numbers

SYNOPSIS

       ausyscall [arch] name | number | --dump | --exact

DESCRIPTION

       ausyscall  is  a  program  that prints out the mapping from syscall name to number and reverse for the given arch. The arch can be anything
       returned by uname -m. If arch is not given, the program will take a guess based on the running image. You may give the syscall name or num-
       ber  and  it  will  find the opposite. You can also dump the whole table with the --dump option. By default a syscall name lookup will be a
       substring match meaning that it will try to match all occurances of the given name with syscalls. So giving a name of chown will match both
       fchown  and  chown  as  any  other syscall with chown in its name. If this behavior is not desired, pass the --exact flag and it will do an
       exact string match.

       This program can be used to verify syscall numbers on a biarch platform for rule optimization. For example, suppose  you  had  an  auditctl
       rule:

       -a always, exit -S open -F exit=-EPERM -k fail-open

       If you wanted to verify that both 32 and 64 bit programs would be audited, run "ausyscall i386 open" and then "ausyscall x86_64 open". Look
       at the returned numbers. If they are different, you will have to write two auditctl rules to get complete coverage.

       -a always,exit -F arch=b32 -S open -F exit=-EPERM -k fail-open
       -a always,exit -F arch=b64 -S open -F exit=-EPERM -k fail-open

OPTIONS

       --dump Print all syscalls for the given arch

       --exact
	      Instead of doing a partial word match, match the given syscall name exactly.

SEE ALSO

       ausearch(8), auditctl(8).

AUTHOR

       Steve Grubb

Red Hat 							     Nov 2008							     AUSYSCALL:(8)

UNIX for Advanced & Expert Users