Date: Mon, 4 Apr 2005 13:55:38 -0500 From: Dan Nelson <dnelson@allantgroup.com> To: Matt <mhersant@comcast.net> Cc: misc@openbsd.org Subject: Re: C programming question Message-ID: <20050404185538.GB42193@dan.emsphone.com> In-Reply-To: <42518AC9.5070208@comcast.net> References: <42518AC9.5070208@comcast.net>
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In the last episode (Apr 04), Matt said: > I need some help understanding some C code. > > int (*if_ioctl) > (struct ifnet *, int, caddr_t); > > int (*if_watchdog) > (int); > > Can someone break down these declarations (if that's what they are)? Is > this a form of typecasting? Thanks for your help. The cdecl command (ports/devel/cutils) is good as decoding stuff like this. Those two lines declare variables that are pointers to functions. $ cdecl explain "int (*if_ioctl) (struct ifnet *, int, caddr_t)" declare if_ioctl as pointer to function (pointer to struct ifnet, int, addr_t) returning int $ cdecl explain "int (*if_watchdog) (int)" declare if_watchdog as pointer to function (int) returning int -- Dan Nelson dnelson@allantgroup.com
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