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Top Forums Programming difference between int ** func() and int *& func() Post 91776 by linuxpenguin on Monday 5th of December 2005 01:34:31 PM
Old 12-05-2005
do you have linux installed. if yes try to use the cdecl utility

this is what i get

cdecl> explain int * *p()
declare p as function returning pointer to pointer to int
cdecl> explain int * &p()
Warning: Unsupported in C -- 'reference'
declare p as function returning reference to pointer to int

so int **func() is a function that returns a pointer to a pointer to int and int * & func() is a function that returns an reference to a pointer to a function, and as seen above the second statement is not supported in C, you can try it in c++ tho.
Test Your Knowledge in Computers #489
Difficulty: Medium
Because interpreted languages are not compiled, syntax errors do not become runtime errors.
True or False?

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

bdflush - start, flush, or tune buffer-dirty-flush daemon SYNOPSIS
#include <sys/kdaemon.h> int bdflush(int func, long *address); int bdflush(int func, long data); DESCRIPTION
Note: Since Linux 2.6, this system call is deprecated and does nothing. It is likely to disappear altogether in a future kernel release. Nowadays, the task performed by bdflush() is handled by the kernel pdflush thread. bdflush() starts, flushes, or tunes the buffer-dirty-flush daemon. Only a privileged process (one with the CAP_SYS_ADMIN capability) may call bdflush(). If func is negative or 0, and no daemon has been started, then bdflush() enters the daemon code and never returns. If func is 1, some dirty buffers are written to disk. If func is 2 or more and is even (low bit is 0), then address is the address of a long word, and the tuning parameter numbered (func-2)/2 is returned to the caller in that address. If func is 3 or more and is odd (low bit is 1), then data is a long word, and the kernel sets tuning parameter numbered (func-3)/2 to that value. The set of parameters, their values, and their valid ranges are defined in the Linux kernel source file fs/buffer.c. RETURN VALUE
If func is negative or 0 and the daemon successfully starts, bdflush() never returns. Otherwise, the return value is 0 on success and -1 on failure, with errno set to indicate the error. ERRORS
EBUSY An attempt was made to enter the daemon code after another process has already entered. EFAULT address points outside your accessible address space. EINVAL An attempt was made to read or write an invalid parameter number, or to write an invalid value to a parameter. EPERM Caller does not have the CAP_SYS_ADMIN capability. VERSIONS
Since version 2.23, glibc no longer supports this obsolete system call. CONFORMING TO
bdflush() is Linux-specific and should not be used in programs intended to be portable. SEE ALSO
sync(1), fsync(2), sync(2) COLOPHON
This page is part of release 4.15 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at Linux 2016-10-08 BDFLUSH(2)

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