Linux Ethernet Bridging - Apr 2021 - [Bridge] [PATCH] Include header for use of PATH_MAX

Since a1f20223cfcf7b9eae8c9e7e7a07e7bf1377f65b in some build
configurations PATH_MAX is undefined.

Build log from Buildroot testing failure:
http://autobuild.buildroot.net/results/3ec818e676827c03f08c264c6c7a53b025b7ba1d/build-end.log

...
/home/giuliobenetti/autobuild/run/instance-0/output-1/host/bin/arm-buildroot-linux-musleabihf-gcc
-Wall -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64  -O2  
-I/home/giuliobenetti/autobuild/run/instance-0/output-1/host/arm-buildroot-linux-musleabihf/sysroot/usr/include
-c libbridge_misc.c
libbridge_init.c: In function 'isbridge':
libbridge_init.c:49:12: error: 'PATH_MAX' undeclared (first use in this
function); did you mean 'AF_MAX'?
   49 |  char path[PATH_MAX];
      |            ^~~~~~~~
      |            AF_MAX
libbridge_init.c:49:12: note: each undeclared identifier is reported only once
for each function it appears in
libbridge_init.c:49:7: warning: unused variable 'path'
[-Wunused-variable]
   49 |  char path[PATH_MAX];
      |       ^~~~
make[2]: *** [Makefile:37: libbridge_init.o] Error 1
make[2]: *** Waiting for unfinished jobs....
libbridge_devif.c: In function 'fpopen':
libbridge_devif.c:33:12: error: 'PATH_MAX' undeclared (first use in this
function); did you mean 'AF_MAX'?
   33 |  char path[PATH_MAX];
      |            ^~~~~~~~
      |            AF_MAX

Signed-off-by: Matthew Weber <matthew.weber at rockwellcollins.com>
---
 libbridge/libbridge_devif.c | 1 +
 libbridge/libbridge_init.c  | 1 +
 2 files changed, 2 insertions(+)

diff --git a/libbridge/libbridge_devif.c b/libbridge/libbridge_devif.c
index 8b7d954..95f7769 100644
--- a/libbridge/libbridge_devif.c
+++ b/libbridge/libbridge_devif.c
@@ -24,6 +24,7 @@
 #include <string.h>
 #include <dirent.h>
 #include <fcntl.h>
+#include <linux/limits.h>
 
 #include "libbridge.h"
 #include "libbridge_private.h"
diff --git a/libbridge/libbridge_init.c b/libbridge/libbridge_init.c
index c914971..645dda6 100644
--- a/libbridge/libbridge_init.c
+++ b/libbridge/libbridge_init.c
@@ -24,6 +24,7 @@
 #include <dirent.h>
 #include <sys/types.h>
 #include <sys/stat.h>
+#include <linux/limits.h>
 
 #include "libbridge.h"
 #include "libbridge_private.h"
-- 
2.17.1

On Mon, 12 Apr 2021 09:30:34 -0500
Matt Weber <matthew.weber at rockwellcollins.com> wrote:
> Since a1f20223cfcf7b9eae8c9e7e7a07e7bf1377f65b in some build
> configurations PATH_MAX is undefined.
> 
> Build log from Buildroot testing failure:
>
http://autobuild.buildroot.net/results/3ec818e676827c03f08c264c6c7a53b025b7ba1d/build-end.log
> 
> ...
>
/home/giuliobenetti/autobuild/run/instance-0/output-1/host/bin/arm-buildroot-linux-musleabihf-gcc
-Wall -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64  -O2  
-I/home/giuliobenetti/autobuild/run/instance-0/output-1/host/arm-buildroot-linux-musleabihf/sysroot/usr/include
-c libbridge_misc.c
> libbridge_init.c: In function 'isbridge':
> libbridge_init.c:49:12: error: 'PATH_MAX' undeclared (first use in
this function); did you mean 'AF_MAX'?
>    49 |  char path[PATH_MAX];
>       |            ^~~~~~~~
>       |            AF_MAX
> libbridge_init.c:49:12: note: each undeclared identifier is reported only
once for each function it appears in
> libbridge_init.c:49:7: warning: unused variable 'path'
[-Wunused-variable]
>    49 |  char path[PATH_MAX];
>       |       ^~~~
> make[2]: *** [Makefile:37: libbridge_init.o] Error 1
> make[2]: *** Waiting for unfinished jobs....
> libbridge_devif.c: In function 'fpopen':
> libbridge_devif.c:33:12: error: 'PATH_MAX' undeclared (first use in
this function); did you mean 'AF_MAX'?
>    33 |  char path[PATH_MAX];
>       |            ^~~~~~~~
>       |            AF_MAX
> 
> Signed-off-by: Matthew Weber <matthew.weber at rockwellcollins.com>
> ---
>  libbridge/libbridge_devif.c | 1 +
>  libbridge/libbridge_init.c  | 1 +
>  2 files changed, 2 insertions(+)
> 
> diff --git a/libbridge/libbridge_devif.c b/libbridge/libbridge_devif.c
> index 8b7d954..95f7769 100644
> --- a/libbridge/libbridge_devif.c
> +++ b/libbridge/libbridge_devif.c
> @@ -24,6 +24,7 @@
>  #include <string.h>
>  #include <dirent.h>
>  #include <fcntl.h>
> +#include <linux/limits.h>
>  
>  #include "libbridge.h"
>  #include "libbridge_private.h"
> diff --git a/libbridge/libbridge_init.c b/libbridge/libbridge_init.c
> index c914971..645dda6 100644
> --- a/libbridge/libbridge_init.c
> +++ b/libbridge/libbridge_init.c
> @@ -24,6 +24,7 @@
>  #include <dirent.h>
>  #include <sys/types.h>
>  #include <sys/stat.h>
> +#include <linux/limits.h>
Shouldn't refer to Linux version of the file.

According IWYU

libbridge/libbridge_devif.c should add these lines:
#include <limits.h>             // for PATH_MAX
#include <linux/if.h>           // for ifreq, IFNAMSIZ, ifr_data, ifr_name
#include <linux/if_bridge.h>    // for __bridge_info, __port_info,
__fdb_entry
#include <sys/ioctl.h>          // for ioctl, SIOCDEVPRIVATE
struct timeval;

libbridge/libbridge_devif.c should remove these lines:
- #include <stdlib.h>  // lines 21-21

The full include-list for libbridge/libbridge_devif.c:
#include <dirent.h>             // for closedir, opendir, DIR
#include <errno.h>              // for errno, EAGAIN
#include <fcntl.h>              // for open, O_WRONLY, SEEK_SET
#include <limits.h>             // for PATH_MAX
#include <linux/if.h>           // for ifreq, IFNAMSIZ, ifr_data, ifr_name
#include <linux/if_bridge.h>    // for __bridge_info, __port_info,
__fdb_entry
#include <stdio.h>              // for snprintf, fclose, fopen, fscanf,
FILE
#include <string.h>             // for memcpy, memset, strerror
#include <sys/ioctl.h>          // for ioctl, SIOCDEVPRIVATE
#include <unistd.h>             // for close, sleep, write
#include "libbridge.h"          // for bridge_info, port_info,
strlcpy, brid...
#include "libbridge_private.h"  // for __jiffies_to_tv,
__tv_to_jiffies, SYS...