forked from Imagelibrary/rtems
Updated the Description section for the Configuration Space Management
routines.
This commit is contained in:
Wade A Smith
@@ -86,21 +86,28 @@ The cfg_mount() function is not supported by this implementation.
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@end table
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@end table
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@subheading DESCRIPTION:
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@subheading DESCRIPTION:
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The @code{cfg_mount} function maps a configuration space defined
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by the file identified by the the @code{file} argument. The
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distinguished node of the mapped configuration space shall be
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mounted in the active space at the point identified bt the
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@code{cfgpath} configuration pathname.
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The @code{notification} argument specifies how changes to the
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If {_POSIX_CFG} is defined:
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mapped configuration space shall be communicated to the application.
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If the @code{notification} argument is NULL, no notification shall
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The @code{cfg_mount} function maps a configuration space defined
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be performed for the mapped configuration space. If the Event
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by the file identified by the the @code{file} argument. The
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Logging option is defined, the notification argument defines the
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distinguished node of the mapped configuration space shall be
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facility to which changes in the mapped configuration space shall
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mounted in the active space at the point identified bt the
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be logged. Otherwise, the @code{notification} argument shall
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@code{cfgpath} configuration pathname.
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specify an implementation defined method of notifying the application
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of changes to the mapped configuration space.
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The @code{notification} argument specifies how changes to the
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mapped configuration space shall be communicated to the application.
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If the @code{notification} argument is NULL, no notification shall
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be performed for the mapped configuration space. If the Event
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Logging option is defined, the notification argument defines the
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facility to which changes in the mapped configuration space shall
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be logged. Otherwise, the @code{notification} argument shall
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specify an implementation defined method of notifying the application
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of changes to the mapped configuration space.
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Otherwise:
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The @code{cfg_mount} function shall fail.
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@subheading NOTES:
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@subheading NOTES:
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@@ -153,10 +160,16 @@ resolution of the cfgpath argument
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@subheading DESCRIPTION:
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@subheading DESCRIPTION:
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The @code{cfg_umount} function unmaps the configuration space whose
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If {_POSIX_CFG} is defined:
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distinguished node is mapped in the active space at the location defined
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by @code{cfgpatah} configuration pathname. All system resources
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The @code{cfg_umount} function unmaps the configuration space whose
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allocated for this configuration space should be deallocated.
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distinguished node is mapped in the active space at the location defined
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by @code{cfgpatah} configuration pathname. All system resources
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allocated for this configuration space should be deallocated.
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Otherwise:
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The @code{cfg_umount} function shall fail.
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@subheading NOTES:
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@subheading NOTES:
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@@ -215,12 +228,18 @@ The named node resides on a read-only configuration space.
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@subheading DESCRIPTION:
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@subheading DESCRIPTION:
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The @code{cfg_mknod} function creates a new node in the configuration
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If {_POSIX_CFG} is defined:
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space which contains the pathname prefix of @cod{cfgpath}. T he node
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name shall be defined by the pathname suffix of @code{cfgpath}. The
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The @code{cfg_mknod} function creates a new node in the configuration
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node name shall be defined by the pathname suffix of @code{cfgpath}.
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space which contains the pathname prefix of @cod{cfgpath}. T he node
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The node permissions shall be specified by the value of @code{mode}.
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name shall be defined by the pathname suffix of @code{cfgpath}. The
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The node type shall be specified by the value of @code{type}.
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node name shall be defined by the pathname suffix of @code{cfgpath}.
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The node permissions shall be specified by the value of @code{mode}.
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The node type shall be specified by the value of @code{type}.
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Otherwise:
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The @code{cfg_mknod} function shall fail.
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@subheading NOTES:
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@subheading NOTES:
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@@ -267,9 +286,16 @@ resolution of the cfgpath argument.
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@subheading DESCRIPTION:
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@subheading DESCRIPTION:
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The @code{cfg_get} function stores the value attribute of the
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If {_POSIX_CFG} is defined:
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configuration node identified by @code{cfgpath}, into the buffer
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described by the @code{value} pointer.
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The @code{cfg_get} function stores the value attribute of the
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configuration node identified by @code{cfgpath}, into the buffer
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described by the @code{value} pointer.
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Otherwise:
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The @code{cfg_get} function shall fail.
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@subheading NOTES:
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@subheading NOTES:
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@@ -316,9 +342,16 @@ resolution of the cfgpath argument.
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@subheading DESCRIPTION:
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@subheading DESCRIPTION:
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The @code{cfg_set} function stores the value specified by the
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If {_POSIX_CFG} is defined:
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@code{value} argument in the configuration node defined by the
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@code{cfgpath} argument.
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The @code{cfg_set} function stores the value specified by the
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@code{value} argument in the configuration node defined by the
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@code{cfgpath} argument.
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Otherwise:
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The @code{cfg_set} function shall fail.
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@subheading NOTES:
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@subheading NOTES:
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@@ -386,17 +419,23 @@ resolution of the cfgpath argument.
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@subheading DESCRIPTION:
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@subheading DESCRIPTION:
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The @code{src} and @code{dest}arguments point to pathnnames which
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If {_POSIX_CFG} is defined:
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name existing nodes. The @code{cfg_link} function shall atomically
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create a link between specified nodes, and increment by one the link
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count of the node specified by the @code{src} argument.
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If the @code{cfg_lin} function fails, no link shall be created, and
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The @code{src} and @code{dest}arguments point to pathnnames which
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the link count of the node shall remain unchanged by this function
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name existing nodes. The @code{cfg_link} function shall atomically
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call.
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create a link between specified nodes, and increment by one the link
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count of the node specified by the @code{src} argument.
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This implementation may require that the calling process has permission
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If the @code{cfg_lin} function fails, no link shall be created, and
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to access the specified nodes.
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the link count of the node shall remain unchanged by this function
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call.
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This implementation may require that the calling process has permission
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to access the specified nodes.
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Otherwise:
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The @code{cfg_link} functioin shall fail.
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@subheading NOTES:
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@subheading NOTES:
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@@ -457,13 +496,19 @@ resolution of the cfgpath argument.
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@subheading DESCRIPTION:
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@subheading DESCRIPTION:
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The @code{cfg_unlink} function removes the link between the node
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If {_POSIX_CFG} is defined:
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specified by the @code{cfgpath} path prefix and the parent node
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specified by @code{cfgpaht}, and shall decrement the link count
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of the @code{cfgpath} node.
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When the link count of the node becomes zero, the space occupied
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The @code{cfg_unlink} function removes the link between the node
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by the node shall be freed and the node shall no longer be accessible.
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specified by the @code{cfgpath} path prefix and the parent node
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specified by @code{cfgpaht}, and shall decrement the link count
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of the @code{cfgpath} node.
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When the link count of the node becomes zero, the space occupied
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by the node shall be freed and the node shall no longer be accessible.
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Otherwise:
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The @code{unlink} function shall fail.
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@subheading NOTES:
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@subheading NOTES:
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@@ -519,40 +564,46 @@ the substituted pathname string exceeded {PATH_MAX}.
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@subheading DESCRIPTION:
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@subheading DESCRIPTION:
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The @code{cfg_open} function shall open a configuration traversal stream
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If {_POSIX_CFG} is defined:
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rooted in the configuration nodes name by the @code{pathnames} argument.
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It shall store a pointer to a CFG object that represents that stream at
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the location identified the @code{cfgstream} pointer. The @code{pathnames}
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argument is an array of character pointers to NULL-terminated strings.
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The last member of this array shall be a NULL pointer.
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The value of @code{options} is the bitwise inclusive OR of values from the
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The @code{cfg_open} function shall open a configuration traversal stream
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following lists. Applications shall supply exactly one of the first two
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rooted in the configuration nodes name by the @code{pathnames} argument.
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values below in @code{options}.
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It shall store a pointer to a CFG object that represents that stream at
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the location identified the @code{cfgstream} pointer. The @code{pathnames}
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argument is an array of character pointers to NULL-terminated strings.
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The last member of this array shall be a NULL pointer.
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The value of @code{options} is the bitwise inclusive OR of values from the
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following lists. Applications shall supply exactly one of the first two
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values below in @code{options}.
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CFG_LOGICAL
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CFG_LOGICAL
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CFG_PHYSICAL
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CFG_PHYSICAL
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Any combination of the remaining flags can be specified in the value of
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Any combination of the remaining flags can be specified in the value of
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@code{options}
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@code{options}
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CFG_COMFOLLOW
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CFG_COMFOLLOW
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CFG_XDEV
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CFG_XDEV
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The @code{cfg_open} argument @code{compar} shall either be NULL or point
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The @code{cfg_open} argument @code{compar} shall either be NULL or point
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to a function that shall be called with two pointers to pointers to CFGENT
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to a function that shall be called with two pointers to pointers to CFGENT
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structures that shall return less than, equal to , or greater than zero if
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structures that shall return less than, equal to , or greater than zero if
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the node referenced by the first argument is considered to be respectively
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the node referenced by the first argument is considered to be respectively
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less than, equal to, or greater than the node referenced by the second.
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less than, equal to, or greater than the node referenced by the second.
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The CFGENT structure fields provided to the comparison routine shall be as
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The CFGENT structure fields provided to the comparison routine shall be as
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described with the exception that the contents of the @code{cfg_path} and
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described with the exception that the contents of the @code{cfg_path} and
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@code{cfg_pathlen} fields are unspecified.
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@code{cfg_pathlen} fields are unspecified.
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This comparison routine is used to determine the order in which nodes in
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This comparison routine is used to determine the order in which nodes in
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directories encountered during the traversal are returned, and the order
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directories encountered during the traversal are returned, and the order
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of traversal when more than one node is specified in the @code{pathnames}
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of traversal when more than one node is specified in the @code{pathnames}
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argument to @code{cfg_open}. If a comparison routine is specified, the
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argument to @code{cfg_open}. If a comparison routine is specified, the
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order of traversal shall be from the least to the greatest. If the
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order of traversal shall be from the least to the greatest. If the
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@code{compar} argument is NULL, the order of traversal shall be as listed
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@code{compar} argument is NULL, the order of traversal shall be as listed
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in the @code{pathnames} argument.
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in the @code{pathnames} argument.
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Otherwise:
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The @code{cfg_open} shall fail.
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@subheading NOTES:
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@subheading NOTES:
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@@ -602,13 +653,47 @@ substituted pathname string exceeded {PATH_MATH}.
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@subheading DESCRIPTION:
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@subheading DESCRIPTION:
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The @code{cfg_read} function returns a pointer to a CFGENT sturcture
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if {_POSIX_CFG} is defined:
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representing a node in the configuration space to which @code{cfgp}
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refers. The returned pointer shall be stored at the location
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indicated by the @code{node} argument.
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The child nodes of each node in the configuration tree is returned
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The @code{cfg_read} function returns a pointer to a CFGENT sturcture
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by @code{cfg_read}.
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representing a node in the configuration space to which @code{cfgp}
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refers. The returned pointer shall be stored at the location
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indicated by the @code{node} argument.
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The child nodes of each node in the configuration tree is returned
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by @code{cfg_read}. If a comparison routine is specified to the
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@code{cfg_open} function, the order of return of the child nodes shall
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be as specified by the routine, from least to greatest. Otherwise
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the order of return is unspecified.
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Structures referencing nodes with children shall be returned by the
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function @code{cfg_read} at least twice [unless the application
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specifies otherwise with @code{cfg_mark}]-once immediately before
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the structures representing their descendants, are returned
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(pre-order), and once immediately after structures representing all
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of their descendants, if any, are returned (post-order). The
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CFGENT structure returned in post-porder (with the exception of the
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@code{cfg_info} field) shall be identical to that returned in pre-order.
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Structures referencing nodes of other types shall be returned at least
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once.
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The fields of the CFGENT structure shall contain the following
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informatation:
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cfg_parent
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cfg_link
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cfg_cycle
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cfg_number
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cfg_pointer
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cfg_path
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cfg_name
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cfg_pathlen
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cfg_namelen
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cfg_level
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cfg_info
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Otherwise:
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The @code{cfg_read} function shall fail.
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@subheading NOTES:
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@subheading NOTES:
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@@ -657,6 +742,28 @@ The function cfg_children() is not supported by this implementation.
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@subheading DESCRIPTION:
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@subheading DESCRIPTION:
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If {_POSIX_CFG} is defined:
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The first @code{cfg_children} call after a @code{cfg_read} shall
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return information about the first node without children under the
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node returned by @code}{cfg_read}. Subsequent calls to
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@code{cfg_children} without the intervening @code{cfg_read} shall
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return information about the remaining nodes without children under
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that same node.
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If @code{cfg_read} has not yet been called for the configuration
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traversal stream represented by @code{cfgp}, @code{cfg_children}
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shall return a pointer to the first entry in a list of the nodes
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represented by the @code{pathnames} argument to @code{cfg_open}.
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In either case, the list shall be NULL-terminated, ordered by the
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user-specified comparison function, if any, and linked through the
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cfg_link field.
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Otherwise:
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The @code{cfg_children} function shall fail.
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@subheading NOTES:
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@subheading NOTES:
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@page
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@page
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@@ -692,10 +799,25 @@ The function cfg_mark() is not supported by this implementation.
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@subheading DESCRIPTION:
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@subheading DESCRIPTION:
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The @code{cfg_mark} function modifies the subsequent behavior of
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If {_POSIX_CF} is defined:
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the cfg functions with regard to the node referenced by the structure
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pointed to by the argument f or the configuration space referenced by
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The @code{cfg_mark} function modifies the subsequent behavior of
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the structure pointed to by the argument @code{cfgp}.
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the cfg functions with regard to the node referenced by the structure
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pointed to by the argument @code{f} or the configuration space referenced
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by the structure pointed to by the argument @code{cfgp}.
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Exactly one of the @code{f} argument and the @code{cfgp} argument shall
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be NULL.
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The value of the @code{options} argument shall be exactly one of the
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flags specified in the following list:
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CFG_AGAIN
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CFG_SKIP
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CFG_FOLLOW
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Otherwise:
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The @code{cfg_mark} function shall fail.
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@subheading NOTES:
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@subheading NOTES:
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@@ -728,8 +850,17 @@ The function cfg_close() is not supported by this implementatioin.
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@subheading DESCRIPTION:
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@subheading DESCRIPTION:
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The @code{cfg_close} function closes a configuration space transversal
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if {_POSIX_CFG} is defined:
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stream.
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The @code{cfg_close} function closes a configuration space transversal
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stream represented by the CFG structure pointed at by the @code{cfgp}
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argument. All system resources allocated for this configuration space
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travsversal stream should be deallocated. Upon return, the value of
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@code{cfgp} need not point to an accessible object of type CFG.
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Otherwise:
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The @code{cfg_close} function shall fail.
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@subheading NOTES:
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@subheading NOTES:
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Reference in New Issue
Block a user