Re: open call and conflicting headers

Geert Fannes <geert.fannes@esat.kuleuven.ac.be> · Tue, 17 Jun 2003 10:01:52 +0000

i found a solution, but it does not give me great satisfaction though. 
the <linux/types.h> header comes in due to #include <linux/videodev.h> 
(video4linux). previously, i've put the headers necessary for the open 
syscall AFTER <linux/videodev.h>, and that gave the problem of 
conflicting types. now, i reversed the order and the problem is gone:

#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <linux/videodev.h>

BUT, i am still interested in the reason of having a sys/types.h and a 
linux/types.h defining the same stuff, and why reversing the order fixes 
the problem. it would also be great if someone could point me to a 
document where the syscalls and their necessary headerfiles are listed 
(i could only find a document @ linuxhq.com listing the syscalls and the 
.c files where they are defined).

greets,
geert.

Geert Fannes wrote:

hello, i want to use the "open" systemcall, but i get conflicting 
headers when i use the header that 'man open' suggests (these are 
<sys/types.h>, <sys/stat.h> and <fcntl.h>):

In file included from GEye.cpp:6:

/usr/include/sys/types.h:61: conflicting types for `typedef __dev_t 
dev_t'

/usr/include/linux/types.h:14: previous declaration as `typedef 
__kernel_dev_t

  dev_t'

/usr/include/sys/types.h:66: conflicting types for `typedef __gid_t 
gid_t'

/usr/include/linux/types.h:41: previous declaration as `typedef 
__kernel_gid_t

  gid_t'

/usr/include/sys/types.h:71: conflicting types for `typedef __mode_t 
mode_t'

/usr/include/linux/types.h:16: previous declaration as `typedef 
__kernel_mode_t

  mode_t'

/usr/include/sys/types.h:76: conflicting types for `typedef __nlink_t 
nlink_t'

/usr/include/linux/types.h:17: previous declaration as `typedef

  __kernel_nlink_t nlink_t'

/usr/include/sys/types.h:81: conflicting types for `typedef __uid_t 
uid_t'

/usr/include/linux/types.h:40: previous declaration as `typedef 
__kernel_uid_t

  uid_t'

i am not sure where the "/usr/include/linux/types.h" comes from, i use 
gtk2.0 also in this program (and v4l). can anyone help me to determine 
which of the two types.h is deprecated, or how i can solve this problem.

thank you,
geert.

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