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Full Discussion: How to implement a system call in linux?
Operating Systems Linux How to implement a system call in linux? Post 302377740 by sunnyhay on Saturday 5th of December 2009 01:14:30 AM
Old 12-05-2009
How to implement a system call in linux?
I encountered a variety of difficulties when implementing a system call as simple as HelloWorld example in Linux so far.
Firstly, according to the book "Linux Kernel Development Second Edition", I tried to implement a syscall in 2.6.31 but no way absolutely because 2.6.10 has a very different way to deal with it by comparison to 2.6.31. In fedora 4(2.6.11) I tried to compile the new kernel versions 2.6.10 or 2.6.11 but failed with unexpected errors. Even "make menuconfig" fails to work in this case.
Secondly, I tried to get help from the example from "http://tldp.org/HOWTO/html_single/Implement-Sys-Call-Linux-2.6-i386/" but still not work. Even the compilation of new kernel 2.6.17 in Ubuntu 6.10(exact 2.6.17) fails to add a syscall.
Last I also got no help from the example "http://www.imada.sdu.dk/~daniel/DM510/assignment1/system-call.html" which indicates how to implement a syscall in recent 2.6.28. But the error always take place when compiling the source with new system call modification on source:
arch/x86/built-in.o: In function `sys_call_table':
(.rodata+0x724): undefined reference to `sys_hellokernel'
make: *** [.tmp_vmlinux1] Error 1
Now can somebody give me a detailed step-by-step howto example to implement a syscall in linux?
Thank you!
 

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LEARN ABOUT ULTRIX

fsck.cramfs

FSCK.CRAMFS(8)						       System Administration						    FSCK.CRAMFS(8)

NAME

       fsck.cramfs - fsck compressed ROM file system

SYNOPSIS

       fsck.cramfs [options] file

DESCRIPTION

       fsck.cramfs is used to check the cramfs file system.

OPTIONS

       -v, --verbose
	      Enable verbose messaging.

       -b, --blocksize blocksize
	      Use this blocksize, defaults to page size. Must be equal to what was set at creation time. Only used for --extract.

       --extract[=directory]
	      Test to uncompress the whole file system. Optionally extract contents of the file to directory.

       -a     This option is silently ignored.

       -y     This option is silently ignored.

       -V, --version
	      Display version information and exit.

       -h, --help
	      Display help text and exit.

EXIT STATUS

	      0      success
	      4      file system was left uncorrected
	      8      operation error, such as unable to allocate memory
	      16     usage information was printed

SEE ALSO

       mount(8), mkfs.cramfs(8)

AVAILABILITY

       The  example  command  is part of the util-linux package and is available from Linux Kernel Archive <https://www.kernel.org/pub/linux/utils
       /util-linux/>.

util-linux							    April 2013							    FSCK.CRAMFS(8)
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