Gdbserver syscall clobber

Daniel Jacobowitz drow at
Tue Jul 17 01:53:48 EST 2007

On Mon, Jul 16, 2007 at 10:43:41AM -0500, Bill Gatliff wrote:
> recv(4, 0x7ffffd60, 1, 0)               = ? ERESTARTSYS (To be restarted)
> --- SIGIO (I/O possible) @ 0 (0) ---
> syscall_4294966784(0xa, 0x7ffffd34, 0x1, 0, 0x1008a3c7, 0x1008b5a3, 0x1008b5a4, 

That's -512, a.k.a. the errno value used by syscall restarting.  I'd
say your glibc does not obey the restartable syscall convention used
by your kernel, and when it tries to restart the syscall the errno
value is not being replaced by the syscall number.  Check the assembly
for recv.

Daniel Jacobowitz

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