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Top Forums Programming Unexplained segmentation fault Post 302508097 by Corona688 on Friday 25th of March 2011 06:08:37 PM
Old 03-25-2011
Quote:
Originally Posted by drl
Sometimes lint-like tools can catch these errors.
Adding -Wall to gcc's commandline can cause it to warn you about a lot of them too.
This User Gave Thanks to Corona688 For This Post:
 

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OUTB(2) 						     Linux Programmer's Manual							   OUTB(2)

NAME
outb, outw, outl, outsb, outsw, outsl, inb, inw, inl, insb, insw, insl, outb_p, outw_p, outl_p, inb_p, inw_p, inl_p - port I/O DESCRIPTION
This family of functions is used to do low-level port input and output. The out* functions do port output, the in* functions do port input; the b-suffix functions are byte-width and the w-suffix functions word-width; the _p-suffix functions pause until the I/O completes. They are primarily designed for internal kernel use, but can be used from user space. You compile with -O or -O2 or similar. The functions are defined as inline macros, and will not be substituted in without optimization enabled, causing unresolved references at link time. You use ioperm(2) or alternatively iopl(2) to tell the kernel to allow the user space application to access the I/O ports in question. Failure to do this will cause the application to receive a segmentation fault. CONFORMING TO
outb() and friends are hardware-specific. The value argument is passed first and the port argument is passed second, which is the opposite order from most DOS implementations. SEE ALSO
ioperm(2), iopl(2) COLOPHON
This page is part of release 3.27 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/. Linux 1995-11-29 OUTB(2)
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