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On 15 Jul 2015 20:43, Sandhya Kumar wrote: > I wish to customize and wrap the libc wrapper for open() system call. > At the moment, I am just trying to add a simple print statement before > the sys_open() is actually invoked. > I am very much aware of GNU linker --wrap option and in fact that > actually solves my problem. But I am altering some other functionality > in libc for which I am anyway picking my custom libc code. So I wish > to place the wrapping logic of open as well in source codes rather > than depending on linker. But when I see the eglibc v2.19 source > codes, many of the wrapper boils down to a template defined in > syscall-template.S due to which I am unable to wrap/alter the logic in > the libc function. > > sysdeps/unix/sysv/linux/wordsize-64/open64.c [EMPTY FILE] > sysdeps/unix/syscall-template.S > > > Can you point me on how to alter this and add a simple puts("Hello") > whenever a open() call is made? BTW I was successful in wrapping > xstat64.c and cases where the files themselves are not empty. try copying sysdeps/unix/sysv/linux/generic/open.c to sysdeps/unix/sysv/linux/open.c and then making your changes in there. -mike
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