Document make_dev_alias_p().

MFC after:	2 weeks

1 files changed, 22 insertions, 1 deletions

diff --git a/share/man/man9/make_dev.9 b/share/man/man9/make_dev.9
index 2281d8f..05cf212 100644
--- a/share/man/man9/make_dev.9
+++ b/share/man/man9/make_dev.9
@@ -24,7 +24,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd October 24, 2010
+.Dd May 03, 2011
 .Dt MAKE_DEV 9
 .Os
 .Sh NAME
@@ -33,6 +33,7 @@
 .Nm make_dev_credf ,
 .Nm make_dev_p ,
 .Nm make_dev_alias ,
+.Nm make_dev_alias_p ,
 .Nm destroy_dev ,
 .Nm destroy_dev_sched ,
 .Nm destroy_dev_sched_cb ,
@@ -54,6 +55,8 @@ and DEVFS registration for devices
 .Fn make_dev_p "int flags" "struct cdev **cdev" "struct cdevsw *devsw" "struct ucred *cr" "uid_t uid" "gid_t gid" "int mode" "const char *fmt" ...
 .Ft struct cdev *
 .Fn make_dev_alias "struct cdev *pdev" "const char *fmt" ...
+.Ft int
+.Fn make_dev_alias_p "int flags" "struct cdev **cdev" "struct cdev *pdev" "const char *fmt" ...
 .Ft void
 .Fn destroy_dev "struct cdev *dev"
 .Ft void
@@ -149,6 +152,15 @@ created device will be never destroyed
 return an error if the device name is invalid or already exists
 .El
 .Pp
+Only 
+.Dv MAKEDEV_NOWAIT ,
+.Dv MAKEDEV_WAITOK 
+and
+.Dv MAKEDEV_CHECKNAME
+values are accepted for the
+.Fn make_dev_alias_p
+function.
+.Pp
 The
 .Dv MAKEDEV_WAITOK
 flag is assumed if none of
@@ -214,6 +226,13 @@ It is an error to call
 prior to calling
 .Fn make_dev .
 .Pp
+.Fn make_dev_alias_p
+function is similar to
+.Fn make_dev_alias
+but it takes a pointer to the resulting
+.Ft *cdev
+as an argument and may return an error.
+.Pp
 The
 .Fa cdev
 returned by
@@ -321,6 +340,8 @@ pointer, otherwise it will return
 .Sh ERRORS
 The
 .Fn make_dev_p
+and
+.Fn make_dev_alias_p
 call will fail and the device will be not registered if:
 .Bl -tag -width Er
 .It Bq Er ENOMEM