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GDB errno gets “Cannot access memory at address 0×8″

When running GDB under Linux, I often want to see why a system call failed, but when I try to print errno, I get “Cannot access memory at address 0×8″. This is because errno is a macro for:

# define errno (*__errno_location ())

The solution to the problem is to print what the macro expands to:
(gdb) p errno
Cannot access memory at address 0×8
(gdb) p (*__errno_location ())
$4 = 1

This entry was posted on Friday, November 17th, 2006 at 1:24 pm and is filed under Uncategorized. You can follow any responses to this entry through the RSS 2.0 feed. Responses are currently closed, but you can trackback from your own site.

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