It looks about right, I am looking at one of my own source files that calls
the functions you refer to and I include
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <unistd.h>
You might want to include the headers in this exact order. When figuring out
the appropriate header files to include, try www.die.net; they have web
searchable man pages for most api functions.
Harry
On Fri, Feb 29, 2008 at 7:51 AM, David van Geest <[EMAIL PROTECTED]>
wrote:
> Hi,
>
> I'm wondering what files I need to include in a user application to
> access a char device using the open(), ioctl(), write(), etc.
>
> Searching the web, it seems like I need some combination of these files:
>
> #include<unistd.h>
> #include<sys/types.h>
> #include<sys/stat.h>
> #include<fcntl.h>
> #include <sys/ioctl.h>
>
> The driver in question is the i2c-dev driver, and the documentation
> instructs you to include the i2c-dev.h included with the lm_sensors
> package, so I'm including /user/lm_sensors/kernel/include/i2c-dev.h,
> which itself takes care of
>
> #include <linux/types.h>
> #include <sys/ioctl.h>
>
> However, using file = open("/dev/i2c",O_RDWR) gives a O_RDWR undefined
> error. To solve this problem, I tried adding #include<fcntl.h>, but
> this gives a long list of errors.
>
> I'm using CodeSourcery G++ for uClinux, here's a portion of the build
> output:
>
> Invoking: GCC C Compiler
> m68k-uclinux-gcc -O0 -g3 -Wall -c -fmessage-length=0 -mcpu=5275 -MMD
> -MP -MF"i2cTest.d" -MT"i2cTest.d" -o"i2cTest.o" "../i2cTest.c"
> In file included from
>
> /home/rr/CodeSourcery/Sourcery_G++/bin/../m68k-uclinux/libc/usr/include/pthread.h:21,
> from
>
> /home/rr/CodeSourcery/Sourcery_G++/bin/../m68k-uclinux/libc/usr/include/bits/uClibc_mutex.h:15,
> from
>
> /home/rr/CodeSourcery/Sourcery_G++/bin/../m68k-uclinux/libc/usr/include/bits/uClibc_stdio.h:119,
> from
>
> /home/rr/CodeSourcery/Sourcery_G++/bin/../m68k-uclinux/libc/usr/include/stdio.h:72,
> from ../i2cTest.c:2:
>
> /home/rr/CodeSourcery/Sourcery_G++/bin/../m68k-uclinux/libc/usr/include/time.h:105:
> error: conflicting types for 'timer_t'
>
> /home/rr/CodeSourcery/Sourcery_G++/bin/../m68k-uclinux/libc/usr/include/linux/types.h:22:
> error: previous declaration of 'timer_t' was here
>
> /home/rr/CodeSourcery/Sourcery_G++/bin/../m68k-uclinux/libc/usr/include/sys/types.h:62:
> error: conflicting types for 'dev_t'
>
> /home/rr/CodeSourcery/Sourcery_G++/bin/../m68k-uclinux/libc/usr/include/linux/types.h:13:
> error: previous declaration of 'dev_t' was here
> ....
>
> That goes on for a while, with lots more conflicting types. It also
> gives an implicit declaration warning, which I'm not sure is a problem
> or not:
>
> ../i2cTest.c:43: warning: implicit declaration of function 'write'
>
> Can anyone help me out with this? I'm really new with using linux
> drivers.
>
> Thanks
> -David
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