suse man page for syscall_get_error

SYSCALL_GET_ERROR(9)						   Machine State					      SYSCALL_GET_ERROR(9)

NAME
       syscall_get_error - check result of traced system call

SYNOPSIS
       long syscall_get_error(struct task_struct * task, struct pt_regs * regs);

ARGUMENTS
       task
	   task of interest, must be blocked

       regs

	   task_pt_regs of task

DESCRIPTION
       Returns 0 if the system call succeeded, or -ERRORCODE if it failed.

       It's only valid to call this when task is stopped for tracing on exit from a system call, due to TIF_SYSCALL_TRACE or TIF_SYSCALL_AUDIT.

Kernel Hackers Manual 2.6.					     July 2010						      SYSCALL_GET_ERROR(9)