Em Sun, 25 Jan 2015 21:36:25 +0100
Felix Janda <felix.janda@xxxxxxxxx> escreveu:
> On glibc, ioctl has the signature ioctl(int, unsigned long int, ...).
> On musl, libc and according to POSIX it is ioctl(int, int, ...).
> Add a configure test adapted from gnulib's ioctl.m4 to make the
> DL_PRELOAD libraries work for both signatures.
This patch breaks compilation on Fedora:
v4l2convert.c:130:45: error: conflicting types for 'ioctl'
LIBV4L_PUBLIC int ioctl(int fd, int request, ...)
^
In file included from v4l2convert.c:37:0:
/usr/include/sys/ioctl.h:41:12: note: previous declaration of 'ioctl' was here
extern int ioctl (int __fd, unsigned long int __request, ...) __THROW;
^
>
> Signed-off-by: Felix Janda <felix.janda@xxxxxxxxx>
> ---
> configure.ac | 12 ++++++++++++
> lib/libv4l1/v4l1compat.c | 4 ++++
> lib/libv4l2/v4l2convert.c | 4 ++++
> 3 files changed, 20 insertions(+)
>
> diff --git a/configure.ac b/configure.ac
> index 4156559..00136d7 100644
> --- a/configure.ac
> +++ b/configure.ac
> @@ -116,6 +116,18 @@ gl_VISIBILITY
> AC_CHECK_HEADERS([sys/klog.h])
> AC_CHECK_FUNCS([klogctl])
>
> +AC_CACHE_CHECK([for ioctl with POSIX signature],
> + [gl_cv_func_ioctl_posix_signature],
> + [AC_COMPILE_IFELSE(
> + [AC_LANG_PROGRAM(
> + [[#include <sys/ioctl.h>]],
> + [[int ioctl (int, int, ...);]])
> + ],
> + [gl_cv_func_ioctl_posix_signature=yes],
> + [gl_cv_func_ioctl_posix_signature=no])
> + ])
> +AC_DEFINE([HAVE_POSIX_IOCTL], [1], [test x$gl_cv_func_ioctl_posix_signature = xyes])
> +
> AC_CHECK_FUNCS([__secure_getenv secure_getenv])
>
> # Check host os
> diff --git a/lib/libv4l1/v4l1compat.c b/lib/libv4l1/v4l1compat.c
> index 07240c1..282173b 100644
> --- a/lib/libv4l1/v4l1compat.c
> +++ b/lib/libv4l1/v4l1compat.c
> @@ -93,7 +93,11 @@ LIBV4L_PUBLIC int dup(int fd)
> return v4l1_dup(fd);
> }
>
> +#ifdef HAVE_POSIX_IOCTL
> +LIBV4L_PUBLIC int ioctl(int fd, int request, ...)
> +#else
> LIBV4L_PUBLIC int ioctl(int fd, unsigned long int request, ...)
> +#endif
> {
> void *arg;
> va_list ap;
> diff --git a/lib/libv4l2/v4l2convert.c b/lib/libv4l2/v4l2convert.c
> index b65da5e..c79f9da 100644
> --- a/lib/libv4l2/v4l2convert.c
> +++ b/lib/libv4l2/v4l2convert.c
> @@ -121,7 +121,11 @@ LIBV4L_PUBLIC int dup(int fd)
> return v4l2_dup(fd);
> }
>
> +#ifdef HAVE_POSIX_IOCTL
> +LIBV4L_PUBLIC int ioctl(int fd, int request, ...)
> +#else
> LIBV4L_PUBLIC int ioctl(int fd, unsigned long int request, ...)
> +#endif
> {
> void *arg;
> va_list ap;
--
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