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UNIX for Dummies Questions & Answers
Segmentation fault
Post 302551126 by jim mcnamara on Monday 29th of August 2011 12:46:45 PM
08-29-2011
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LEARN ABOUT OSF1
is_kseg_va
IS_KSEG_VA(9r) IS_KSEG_VA(9r) NAME
IS_KSEG_VA, IS_SEG0_VA, IS_SEG1_VA - General: Determine if the specified address is located in the kernel-unmapped address space, the user- mapped address space, and the kernel-mapped address space. SYNOPSIS
void IS_KSEG_VA( unsigned long addr ); void IS_SEG0_VA( unsigned long addr ); void IS_SEG1_VA( unsigned long addr ); ARGUMENTS
Specifies the virtual address. DESCRIPTION
The IS_KSEG_VA routine determines if the specified address is located in the kernel-unmapped address space. The IS_SEG0_VA routine deter- mines if the specified address is located in the user-mapped address space. The IS_SEG1_VA routine determines if the specified address is located in the kernel-mapped address space. RETURN VALUES
None EXAMPLE
The following code fragment shows a call to IS_KSEG_VA: . . . caddr_t virt_addr; [1] unsigned phys_addr; [2] . . . if(IS_KSEG_VA(virt_addr)) { [3] phys_addr = KSEG_TO_PHYS(virt_addr); [4] . . . Declares a variable to store the user buffer's virtual address. Declares a variable to store the physical address returned by KSEG_TO_PHYS. Before calling KSEG_TO_PHYS, calls IS_KSEG_VA to determine if the virtual address is from the kernel-unmapped address space. If the virtual address is from the kernel-unmapped address space, then calls KSEG_TO_PHYS to convert the address to a corresponding physi- cal address. SEE ALSO
Routines: KSEG_TO_PHYS(9r), PHYS_TO_KSEG(9r) IS_KSEG_VA(9r)