Date: Thu, 23 Jan 2003 14:17:46 +0100 From: "Simon 'corecode' Schubert" <corecode@corecode.ath.cx> To: "Daniel O'Connor" <doconnor@gsoft.com.au> Cc: freebsd-ports-bugs@freebsd.org Subject: Re: ports/47348: New port for TeamSpeak Message-ID: <20030123141746.2c5ccf95.corecode@corecode.ath.cx> In-Reply-To: <1043317182.45633.1.camel@chowder.dons.net.au> References: <200301222310.h0MNA3Vd075145@freefall.freebsd.org> <20030123110828.1836d662.corecode@corecode.ath.cx> <1043317182.45633.1.camel@chowder.dons.net.au>
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Lately Daniel O'Connor told:
> > working. how about a (linux-so)library to preload that intercepts just
> > ioctl and tests for this specific request (and then just returns 0)?
> Hmm, well the idea has merit :)
>
> I'm not sure I'm that enthusiastic..
>
> IMHO it's fine to require a certain FreeBSD version to run something.
>
> Do you have an example I could copy?
*scribble* *code*
uhm, yea. just wrote one:
# This is a shell archive. Save it in a file, remove anything before
# this line, and then unpack it by entering "sh file". Note, it may
# create directories; files and directories will be owned by you and
# have default permissions.
#
# This archive contains:
#
# testpreloadioctl
# testpreloadioctl/testioctl.c
# testpreloadioctl/Makefile.lib
# testpreloadioctl/testioctl.h
# testpreloadioctl/preloadioctl.c
# testpreloadioctl/Makefile
# testpreloadioctl/Makefile.bin
#
echo c - testpreloadioctl
mkdir -p testpreloadioctl > /dev/null 2>&1
echo x - testpreloadioctl/testioctl.c
sed 's/^X//' >testpreloadioctl/testioctl.c << 'END-of-testpreloadioctl/testioctl.c'
X#include <sys/ioctl.h>
X
X#include <errno.h>
X#include <fcntl.h>
X#include <stdio.h>
X#include <string.h>
X
X#include "testioctl.h"
X
Xvoid usage();
X
Xint main(int argc, char *argv[])
X{
X int fd;
X int one = 1;
X int ret = 1;
X
X if (argc != 2) {
X usage(argv[0]);
X /* NOTREACHED */
X }
X
X if ((fd = open(argv[1], O_RDONLY)) == -1) {
X perror(NULL);
X exit(1);
X /* NOTREACHED */
X }
X
X if (ioctl(fd, TESTIOCTL_REQ, &one) == -1)
X fprintf(stderr, "error issuing TESTIOCTL_REQ: %s\n", strerror(errno));
X else {
X printf("TESTIOCTL_REQ succeeded!\n");
X ret = 0;
X }
X
X close(fd);
X return ret;
X}
X
Xvoid usage()
X{
X fprintf(stderr, "usage: testioctl <testdev>\n");
X exit(1);
X}
END-of-testpreloadioctl/testioctl.c
echo x - testpreloadioctl/Makefile.lib
sed 's/^X//' >testpreloadioctl/Makefile.lib << 'END-of-testpreloadioctl/Makefile.lib'
XSRCS= preloadioctl.c
XSHLIB_NAME?= preloadioctl.so
X
X.include <bsd.lib.mk>
END-of-testpreloadioctl/Makefile.lib
echo x - testpreloadioctl/testioctl.h
sed 's/^X//' >testpreloadioctl/testioctl.h << 'END-of-testpreloadioctl/testioctl.h'
X#ifndef TESTIOCTL_REQ
X# define TESTIOCTL_REQ 0x7654 /* some random number */
X#endif /* TESTIOCTL_REQ */
END-of-testpreloadioctl/testioctl.h
echo x - testpreloadioctl/preloadioctl.c
sed 's/^X//' >testpreloadioctl/preloadioctl.c << 'END-of-testpreloadioctl/preloadioctl.c'
X#include <dlfcn.h>
X#include <errno.h>
X#include <stdio.h>
X
X#include "testioctl.h"
X
Xint ioctl(int fd, unsigned long req, char *param)
X{
X if (req == TESTIOCTL_REQ)
X return 0;
X /* NOTREACHED */
X else {
X static int (*orig_ioctl)(int, unsigned long, char *) = NULL;
X
X if (orig_ioctl == NULL) {
X if ((orig_ioctl = (int(*)(int, unsigned long, char *))
X dlfunc(RTLD_NEXT, "ioctl")) == NULL) {
X fprintf(stderr, "preloadioctl: %s\n", dlerror());
X return ENOSYS;
X }
X }
X
X return orig_ioctl(fd, req, param);
X /* NOTREACHED */
X }
X}
END-of-testpreloadioctl/preloadioctl.c
echo x - testpreloadioctl/Makefile
sed 's/^X//' >testpreloadioctl/Makefile << 'END-of-testpreloadioctl/Makefile'
XPROG= testioctl
XSHLIB_NAME= preloadioctl.so
X
XTESTDEV?= /dev/dsp
X
X.DEFAULT: .MAKE
X.for file in Makefile.lib Makefile.bin
X ${MAKE} -f ${file} ${MAKEFLAGS} DEPENDFILE=.depend.${file} ${.TARGETS}
X.endfor
X
Xtest: all
X @${ECHO} "===> Testing without preload"
X -${.CURDIR}/${PROG} ${TESTDEV}
X @${ECHO} "===> Testing with preload"
X -${ENV} LD_PRELOAD=${.CURDIR}/${SHLIB_NAME} ${.CURDIR}/${PROG} ${TESTDEV}
X
END-of-testpreloadioctl/Makefile
echo x - testpreloadioctl/Makefile.bin
sed 's/^X//' >testpreloadioctl/Makefile.bin << 'END-of-testpreloadioctl/Makefile.bin'
XPROG?= testioctl
XSRCS= testioctl.c
XNOMAN= yes
X
X.include <bsd.prog.mk>
END-of-testpreloadioctl/Makefile.bin
exit
have fun
cheers
simon
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