1SYSCALL_SET_RETURN_V(9)          Machine State         SYSCALL_SET_RETURN_V(9)
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NAME

6       syscall_set_return_value - change the return value of a traced system
7       call
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SYNOPSIS

10       void syscall_set_return_value(struct task_struct * task,
11                                     struct pt_regs * regs, int error,
12                                     long val);
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ARGUMENTS

15       task
16           task of interest, must be blocked
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18       regs
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20           task_pt_regs of task
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22       error
23           negative error code, or zero to indicate success
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25       val
26           user return value if error is zero
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DESCRIPTION

29       This changes the results of the system call that user mode will see. If
30       error is zero, the user sees a successful system call with a return
31       value of val. If error is nonzero, it´s a negated errno code; the user
32       sees a failed system call with this errno code.
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34       It´s only valid to call this when task is stopped for tracing on exit
35       from a system call, due to TIF_SYSCALL_TRACE or TIF_SYSCALL_AUDIT.
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39Kernel Hackers Manual 2.6.         June 2019           SYSCALL_SET_RETURN_V(9)