[infiniband-diags PATCH 0/2] libudev usage fixes

[infiniband-diags PATCH 0/2] libudev usage fixes

[Michal Schmidt]

Hello,
the first patch simplifies code.
The second patch fixes an overlinking issue.
Regards,
Michal

Michal Schmidt (2):
  rdma-ndd: never use udev_get_sys_path()
  build-sys: avoid overlinking to libudev

 Makefile.am    |  6 ++++++
 configure.ac   | 10 +++++-----
 src/rdma-ndd.c | 19 +++++--------------
 3 files changed, 16 insertions(+), 19 deletions(-)

-- 
2.4.3

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[infiniband-diags PATCH 1/2] rdma-ndd: never use udev_get_sys_path()

[Michal Schmidt]

The function was deprecated and later dropped by udev entirely
because it was pointless.
Quoting kernel's Documentation/sysfs-rules.txt:
  sysfs is always at /sys
  Parsing /proc/mounts is a waste of time. Other mount points are
  a system configuration bug you should not try to solve. [...]

Signed-off-by: Michal Schmidt <mschmidt-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
---
 configure.ac   |  1 -
 src/rdma-ndd.c | 19 +++++--------------
 2 files changed, 5 insertions(+), 15 deletions(-)

diff --git a/configure.ac b/configure.ac
index b9b7ad84ee..ece1d530a7 100644
--- a/configure.ac
+++ b/configure.ac
@@ -214,7 +214,6 @@ if test x$rdmandd = xyes; then
     AC_CHECK_HEADER(libudev.h, with_udev="yes", with_udev="no")
     AC_CHECK_LIB(udev, udev_monitor_ref, [], AC_MSG_ERROR(libudev is required for rdma-ndd...))
     AC_CONFIG_FILES([doc/man/rdma-ndd.8 etc/rdma-ndd.init])
-    AC_CHECK_FUNCS_ONCE(udev_get_sys_path)
 fi
 
 dnl Generate doc/man/*.in files if possible
diff --git a/src/rdma-ndd.c b/src/rdma-ndd.c
index 194c2cd865..d40e7567db 100644
--- a/src/rdma-ndd.c
+++ b/src/rdma-ndd.c
@@ -58,9 +58,7 @@ struct udev_monitor *mon;
 #include "ibdiag_common.h"
 
 #define SYS_HOSTNAME "/proc/sys/kernel/hostname"
-#define DEF_SYS_DIR "/sys"
-char *sys_dir = DEF_SYS_DIR;
-#define SYS_INFINIBAND "class/infiniband"
+#define SYS_INFINIBAND "/sys/class/infiniband"
 #define DEFAULT_RETRY_RATE 60
 #define DEFAULT_RETRY_COUNT 0
 #define DEFAULT_ND_FORMAT "%h %d"
@@ -122,8 +120,8 @@ static int update_node_desc(const char *device, const char *hostname, int force)
 	char nd_file[PATH_MAX];
 	FILE *f;
 
-	snprintf(nd_file, sizeof(nd_file), "%s/%s/%s/node_desc",
-			sys_dir, SYS_INFINIBAND, device);
+	snprintf(nd_file, sizeof(nd_file), SYS_INFINIBAND "/%s/node_desc",
+			device);
 	nd_file[sizeof(nd_file)-1] = '\0';
 
 	f = fopen(nd_file, "r+");
@@ -160,14 +158,10 @@ static int set_rdma_node_desc(const char *hostname, int force)
 {
 	DIR *class_dir;
 	struct dirent *dent;
-	char dev_dir[PATH_MAX];
 
-	snprintf(dev_dir, sizeof(dev_dir), "%s/%s", sys_dir, SYS_INFINIBAND);
-	dev_dir[sizeof(dev_dir)-1] = '\0';
-
-	class_dir = opendir(dev_dir);
+	class_dir = opendir(SYS_INFINIBAND);
 	if (!class_dir) {
-		syslog(LOG_INFO, "Failed to open %s", dev_dir);
+		syslog(LOG_INFO, "Failed to open " SYS_INFINIBAND);
 		return -ENOSYS;
 	}
 
@@ -261,9 +255,6 @@ static void setup_udev(void)
 
 	udev_set_log_fn(udev, udev_log_fn);
 	udev_set_log_priority(udev, LOG_INFO);
-#if HAVE_UDEV_GET_SYS_PATH
-	sys_dir = (char *)udev_get_sys_path(udev);
-#endif
 }
 
 static int get_udev_fd(void)
-- 
2.4.3

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Re: [infiniband-diags PATCH 1/2] rdma-ndd: never use udev_get_sys_path()

[ira.weiny]

On Thu, Jun 25, 2015 at 04:12:01PM +0200, Michal Schmidt wrote:
> The function was deprecated and later dropped by udev entirely
> because it was pointless.
> Quoting kernel's Documentation/sysfs-rules.txt:
>   sysfs is always at /sys
>   Parsing /proc/mounts is a waste of time. Other mount points are
>   a system configuration bug you should not try to solve. [...]
> 
> Signed-off-by: Michal Schmidt <mschmidt-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>

Thanks applied,
Ira

> ---
>  configure.ac   |  1 -
>  src/rdma-ndd.c | 19 +++++--------------
>  2 files changed, 5 insertions(+), 15 deletions(-)
> 
> diff --git a/configure.ac b/configure.ac
> index b9b7ad84ee..ece1d530a7 100644
> --- a/configure.ac
> +++ b/configure.ac
> @@ -214,7 +214,6 @@ if test x$rdmandd = xyes; then
>      AC_CHECK_HEADER(libudev.h, with_udev="yes", with_udev="no")
>      AC_CHECK_LIB(udev, udev_monitor_ref, [], AC_MSG_ERROR(libudev is required for rdma-ndd...))
>      AC_CONFIG_FILES([doc/man/rdma-ndd.8 etc/rdma-ndd.init])
> -    AC_CHECK_FUNCS_ONCE(udev_get_sys_path)
>  fi
>  
>  dnl Generate doc/man/*.in files if possible
> diff --git a/src/rdma-ndd.c b/src/rdma-ndd.c
> index 194c2cd865..d40e7567db 100644
> --- a/src/rdma-ndd.c
> +++ b/src/rdma-ndd.c
> @@ -58,9 +58,7 @@ struct udev_monitor *mon;
>  #include "ibdiag_common.h"
>  
>  #define SYS_HOSTNAME "/proc/sys/kernel/hostname"
> -#define DEF_SYS_DIR "/sys"
> -char *sys_dir = DEF_SYS_DIR;
> -#define SYS_INFINIBAND "class/infiniband"
> +#define SYS_INFINIBAND "/sys/class/infiniband"
>  #define DEFAULT_RETRY_RATE 60
>  #define DEFAULT_RETRY_COUNT 0
>  #define DEFAULT_ND_FORMAT "%h %d"
> @@ -122,8 +120,8 @@ static int update_node_desc(const char *device, const char *hostname, int force)
>  	char nd_file[PATH_MAX];
>  	FILE *f;
>  
> -	snprintf(nd_file, sizeof(nd_file), "%s/%s/%s/node_desc",
> -			sys_dir, SYS_INFINIBAND, device);
> +	snprintf(nd_file, sizeof(nd_file), SYS_INFINIBAND "/%s/node_desc",
> +			device);
>  	nd_file[sizeof(nd_file)-1] = '\0';
>  
>  	f = fopen(nd_file, "r+");
> @@ -160,14 +158,10 @@ static int set_rdma_node_desc(const char *hostname, int force)
>  {
>  	DIR *class_dir;
>  	struct dirent *dent;
> -	char dev_dir[PATH_MAX];
>  
> -	snprintf(dev_dir, sizeof(dev_dir), "%s/%s", sys_dir, SYS_INFINIBAND);
> -	dev_dir[sizeof(dev_dir)-1] = '\0';
> -
> -	class_dir = opendir(dev_dir);
> +	class_dir = opendir(SYS_INFINIBAND);
>  	if (!class_dir) {
> -		syslog(LOG_INFO, "Failed to open %s", dev_dir);
> +		syslog(LOG_INFO, "Failed to open " SYS_INFINIBAND);
>  		return -ENOSYS;
>  	}
>  
> @@ -261,9 +255,6 @@ static void setup_udev(void)
>  
>  	udev_set_log_fn(udev, udev_log_fn);
>  	udev_set_log_priority(udev, LOG_INFO);
> -#if HAVE_UDEV_GET_SYS_PATH
> -	sys_dir = (char *)udev_get_sys_path(udev);
> -#endif
>  }
>  
>  static int get_udev_fd(void)
> -- 
> 2.4.3
> 
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[infiniband-diags PATCH 2/2] build-sys: avoid overlinking to libudev

[Michal Schmidt]

Not all built binaries need to link to udev, only rdma-ndd.
Use pkg-config to detect udev in configure.ac.

Signed-off-by: Michal Schmidt <mschmidt-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
---
 Makefile.am  | 6 ++++++
 configure.ac | 9 +++++----
 2 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/Makefile.am b/Makefile.am
index 057508b18d..93af707ad6 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -130,6 +130,12 @@ src_ibcacheedit_LDFLAGS = -L$(top_builddir)/libibnetdisc -libnetdisc
 src_dump_fts_SOURCES = src/dump_fts.c
 src_dump_fts_LDFLAGS = -L$(top_builddir)/libibnetdisc -libnetdisc
 
+if ENABLE_RDMA_NDD
+src_rdma_ndd_SOURCES = src/rdma-ndd.c
+src_rdma_ndd_CFLAGS = $(AM_CFLAGS) $(UDEV_CFLAGS)
+src_rdma_ndd_LDADD = libcommon.a $(UDEV_LIBS)
+endif
+
 BUILT_SOURCES = ibdiag_version
 ibdiag_version:
 	if [ -x $(top_srcdir)/gen_ver.sh ] ; then \
diff --git a/configure.ac b/configure.ac
index ece1d530a7..090b6ecf76 100644
--- a/configure.ac
+++ b/configure.ac
@@ -210,11 +210,12 @@ default_start="null"
 AC_SUBST(DEFAULT_START, $default_start)
 AC_SUBST(DEFAULT_STOP, $default_stop)
 
-if test x$rdmandd = xyes; then
-    AC_CHECK_HEADER(libudev.h, with_udev="yes", with_udev="no")
-    AC_CHECK_LIB(udev, udev_monitor_ref, [], AC_MSG_ERROR(libudev is required for rdma-ndd...))
+AS_IF([test x$rdmandd = xyes], [
+    PKG_CHECK_MODULES([UDEV], [libudev])
     AC_CONFIG_FILES([doc/man/rdma-ndd.8 etc/rdma-ndd.init])
-fi
+    AC_SUBST([UDEV_CFLAGS])
+    AC_SUBST([UDEV_LIBS])
+])
 
 dnl Generate doc/man/*.in files if possible
 DOC_DATE="`date +%Y-%m-%d`"
-- 
2.4.3

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Re: [infiniband-diags PATCH 2/2] build-sys: avoid overlinking to libudev

[ira.weiny]

On Thu, Jun 25, 2015 at 04:12:02PM +0200, Michal Schmidt wrote:
> Not all built binaries need to link to udev, only rdma-ndd.
> Use pkg-config to detect udev in configure.ac.
> 
> Signed-off-by: Michal Schmidt <mschmidt-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>

Thanks applied,
Ira

> ---
>  Makefile.am  | 6 ++++++
>  configure.ac | 9 +++++----
>  2 files changed, 11 insertions(+), 4 deletions(-)
> 
> diff --git a/Makefile.am b/Makefile.am
> index 057508b18d..93af707ad6 100644
> --- a/Makefile.am
> +++ b/Makefile.am
> @@ -130,6 +130,12 @@ src_ibcacheedit_LDFLAGS = -L$(top_builddir)/libibnetdisc -libnetdisc
>  src_dump_fts_SOURCES = src/dump_fts.c
>  src_dump_fts_LDFLAGS = -L$(top_builddir)/libibnetdisc -libnetdisc
>  
> +if ENABLE_RDMA_NDD
> +src_rdma_ndd_SOURCES = src/rdma-ndd.c
> +src_rdma_ndd_CFLAGS = $(AM_CFLAGS) $(UDEV_CFLAGS)
> +src_rdma_ndd_LDADD = libcommon.a $(UDEV_LIBS)
> +endif
> +
>  BUILT_SOURCES = ibdiag_version
>  ibdiag_version:
>  	if [ -x $(top_srcdir)/gen_ver.sh ] ; then \
> diff --git a/configure.ac b/configure.ac
> index ece1d530a7..090b6ecf76 100644
> --- a/configure.ac
> +++ b/configure.ac
> @@ -210,11 +210,12 @@ default_start="null"
>  AC_SUBST(DEFAULT_START, $default_start)
>  AC_SUBST(DEFAULT_STOP, $default_stop)
>  
> -if test x$rdmandd = xyes; then
> -    AC_CHECK_HEADER(libudev.h, with_udev="yes", with_udev="no")
> -    AC_CHECK_LIB(udev, udev_monitor_ref, [], AC_MSG_ERROR(libudev is required for rdma-ndd...))
> +AS_IF([test x$rdmandd = xyes], [
> +    PKG_CHECK_MODULES([UDEV], [libudev])
>      AC_CONFIG_FILES([doc/man/rdma-ndd.8 etc/rdma-ndd.init])
> -fi
> +    AC_SUBST([UDEV_CFLAGS])
> +    AC_SUBST([UDEV_LIBS])
> +])
>  
>  dnl Generate doc/man/*.in files if possible
>  DOC_DATE="`date +%Y-%m-%d`"
> -- 
> 2.4.3
> 
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