SYSCALL_ROLLBACK - Online Linux Manual PageSection : 9
Updated : June 2018
Source : Kernel Hackers Manual 2​.6​.
Note : Machine State

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NAMEsyscall_rollback − roll back registers after an aborted system call

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SYNOPSISvoid syscall_rollback(struct task_struct * task, struct pt_regs * regs);

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ARGUMENTStask task of interest, must be in system call exit tracing regs task_pt_regs of task

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DESCRIPTIONIt´s only valid to call this when task is stopped for system call exit tracing (due to TIF_SYSCALL_TRACE or TIF_SYSCALL_AUDIT), after tracehook_report_syscall_entry returned nonzero to prevent the system call from taking place​. This rolls back the register state in regs so it´s as if the system call instruction was a no−op​. The registers containing the system call number and arguments are as they were before the system call instruction​. This may not be the same as what the register state looked like at system call entry tracing​. 0

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