How does NORET_TYPE works ? Post: 302161578

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Operating Systems Linux How does NORET_TYPE works ? Post 302161578 by amit4g on Friday 25th of January 2008 05:30:45 AM

01-25-2008

Registered User

How does NORET_TYPE works ?

Hi,

I was looking at the panic() code in linux kernel which is defined as:
51 /**
52 * panic - halt the system
53 * @fmt: The text string to print
54 *
55 * Display a message, then perform cleanups.
56 *
57 * This function never returns.
58 */
59
60 NORET_TYPE void panic(const char * fmt, ...)

where, NORET_TYPE is declared as
/*
753 * Ok, these declarations are also in <linux/kernel.h> but none of the
754 * ext3 source programs needs to include it so they are duplicated here.
755 */

# define NORET_TYPE /**/ <====

Please help me in understanding a #defined variable(NORET_TYPE here) which is not defined to anything.
I know that panic() function was designed in this way to not to return anything{in case of panic,there won't be anyone to catch the return value from panic() },but how does this work.
i think a program in user land having a #defined variable which is left blank will throw compile time error.how this is implemented in linux kernel ?
I don't know much about C,hence please excuse me if this is a stupid querry .

~amit

amit4g

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LEARN ABOUT SUSE

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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