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Updated the STATUS CODE section for the routines in this file.

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This commit is contained in:
Wade A Smith
1998-09-30 20:21:45 +00:00
parent b931d05af0
commit 8dd54b6363
1 changed files with 142 additions and 394 deletions
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536
doc/new_chapters/confspace.t
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@@ -85,6 +85,9 @@ int cfg_mount(
@subheading STATUS CODES:
A successful call to @code{cfg_mount()} returns a value of zero
and an unsuccessful call returns the @code{errno}.
@table @b
@item EPERM
The caller does not have the appropriate privilege.
@@ -93,7 +96,7 @@ The caller does not have the appropriate privilege.
Search permission is denied for a component of the path prefix.
@item EEXIST
The file specified by the file argument does not exist
The file specified by the @code{file} argument does not exist
@item ENAMETOOLONG
A component of a pathname exceeded @code{NAME_MAX} characters,
@@ -104,10 +107,10 @@ or an entire path name exceed @code{PATH_MAX} characters while
A component of @code{cfgpath} does not exist.
@item ENOTDIR
A component of the file path prefix is not a directory.
A component of the @code{file} path prefix is not a directory.
@item EBUSY
The configuration space defined by file is already mounted.
The configuration space defined by @code{file} is already mounted.
@item EINVAL
The notification argument specifies an invalid log facility.
@@ -157,6 +160,9 @@ int cfg_unmount(
@subheading STATUS CODES:
A successful call to @code{cfg_umount()} returns a value of zero
and an unsuccessful call returns the @code{errno}.
@table @b
@item EPERM
The caller does not have the appropriate privileges.
@@ -165,7 +171,7 @@ The caller does not have the appropriate privileges.
Search permission is denied for a component of the path prefix.
@item ENOENT
A component of cfgpath does not exist.
A component of @code{cfgpath} does not exist.
@item ENAMETOOLONG
A component of a pathname exceeded @code{NAME_MAX} characters,
@@ -183,7 +189,7 @@ referenced by the cfgpath argument.
@item ELOOP
A node appears more than once in the path specified by the
@code{cfg_path} argument
@code{cfgpath} argument
@item ELOOP
More than @code{SYMLOOP_MAX} symbolic links were encountered during
@@ -225,6 +231,9 @@ int cfg_mknod(
@subheading STATUS CODES:
A successful call to @code{cfg_mknod()} returns a value of zero
and an unsuccessful call returns the @code{errno}.
@table @b
@item ENAMETOOLONG
A component of a pathname exceeded @code{NAME_MAX} characters,
@@ -237,9 +246,6 @@ A component of the path prefix does not exist.
@item EACCES
Search permission is denied for a component of the path prefix.
@item ELOOP
Too many symbolic links were encountered in translating the
pathname.
@item EPERM
The calling process does not have the appropriate privilege.
@@ -255,11 +261,11 @@ The value of @code{type} is invalid.
@item ELOOP
A node appears more than once in the path specified by the
@cdoe{cfg_path} argument
@code{cfg_path} argument
@item ELOOP
More than @code{SYMLOOP_MAX} symbolic links were encountered during
resolution of the cfgpath argument.
resolution of the @code{cfgpath} argument.
@item EROFS
The named @code{node} resides on a read-only configuration space.
@@ -300,6 +306,9 @@ int cfg_get(
@subheading STATUS CODES:
A successful call to @code{cfg_get()} returns a value of zero
and an unsuccessful call returns the @code{errno}.
@table @b
@item ENAMETOOLONG
A component of a pathname exceeded @code{NAME_MAX} characters,
@@ -307,7 +316,7 @@ or an entire path name exceed @code{PATH_MAX} characters while
@code{_POSIX_NO_TRUNC} is in effect.
@item ENOENT
A component of cfgpath does not exist.
A component of @code{cfgpath} does not exist.
@item EACCES
Search permission is denied for a component of the path prefix.
@@ -317,17 +326,17 @@ The calling process does not have the appropriate privileges.
@item ELOOP
A node appears more than once in the path specified by the
cfg_path argument
@code{cfgpath} argument
@item ELOOP
More than @code{SYMLOOP_MAX} symbolic links were encountered during
resolution of the cfgpath argument.
resolution of the @code{cfgpath} argument.
@end table
@subheading DESCRIPTION:
The @code{cfg_get} function stores the value attribute of the
The @code{cfg_get()} function stores the value attribute of the
configuration node identified by @code{cfgpath}, into the buffer
described by the @code{value} pointer.
@@ -357,6 +366,9 @@ int cfg_set(
@subheading STATUS CODES:
A successful call to @code{cfg_set()} returns a value of zero
and an unsuccessful call returns the @code{errno}.
@table @b
@item ENAMETOOLONG
A component of a pathname exceeded @code{NAME_MAX} characters,
@@ -364,7 +376,7 @@ or an entire path name exceed @code{PATH_MAX} characters while
@code{_POSIX_NO_TRUNC} is in effect.
@item ENOENT
A component of cfgpath does not exist
A component of @code{cfgpath} does not exist
@item EACCES
Search permission is denied for a component of the path prefix.
@@ -374,7 +386,7 @@ The calling process does not have the appropriate privilege.
@item ELOOP
A node appears more than once in the path specified by the
cfg-path argument.
@code{cfgpath} argument.
@item ELOOP
More than @code{SYMLOOP_MAX} symbolic links were encountered during
@@ -384,7 +396,7 @@ resolution of the cfgpath argument.
@subheading DESCRIPTION:
The @code{cfg_set} function stores the value specified by the
The @code{cfg_set()} function stores the value specified by the
@code{value} argument in the configuration node defined by the
@code{cfgpath} argument.
@@ -414,6 +426,9 @@ int cfg_link(
@subheading STATUS CODES:
A successful call to @code{cfg_link()} returns a value of zero
and an unsuccessful call returns the @code{errno}.
@table @b
@item ENAMETOOLONG
A component of a pathname exceeded @code{NAME_MAX} characters,
@@ -431,17 +446,17 @@ The requested link requires writing in a node with a mode that
denies write permission.
@item ENOENT
The node named by src does not exist.
The node named by @code{src} does not exist.
@item EEXIST
The node named by dest does exist.
The node named by @code{dest} does exist.
@item EPERM
The calling process does not have the appropriate privilege to
modify the node indicated by the src argument.
modify the node indicated by the @code{src} argument.
@item EXDEV
The link named by dest and the node named by src are from different
The link named by @code{dest} and the node named by @code{src} are from different
configuration spaces.
@item ENOSPC
@@ -457,28 +472,18 @@ configuration space to make the link entry.
The requested link requires writing in a node on a read-only
configuration space.
@item ELOOP
A node appears more than once in the path specified by the
cfg-path argument.
@item ELOOP
More than @code{SYMLOOP_MAX} symbolic links were encountered during
resolution of the cfgpath argument.
@end table
@subheading DESCRIPTION:
The @code{src} and @code{dest}arguments point to pathnames which
name existing nodes. The @code{cfg_link} function atomically creates
The @code{src} and @code{dest} arguments point to pathnames which
name existing nodes. The @code{cfg_link()} function atomically creates
a link between specified nodes, and increment by one the link count
of the node specified by the @code{src} argument.
If the @code{cfg_link} function fails, no link is created, and the
If the @code{cfg_link()} function fails, no link is created, and the
link count of the node remains unchanged by this function call.
This implementation may require that the calling process has permission
to access the specified nodes.
@subheading NOTES:
@@ -505,14 +510,14 @@ int cfg_unlink(
@subheading STATUS CODES:
A successful call to @code{cfg_unlink()} returns a value of zero
and an unsuccessful call returns the @code{errno}.
@table @b
@item ENAMETOOLONG
A component of a pathname exceeded @code{NAME_MAX} characters,
or an entire path name exceed @code{PATH_MAX} characters.
@item ENOENT
The named node does not exist.
@item EACCES
Search permission is denied on the node containing the link to
be removed.
@@ -522,11 +527,11 @@ Write permission is denied on the node containing the link to
be removed.
@item ENOENT
A component of cfgpath does not exist.
A component of @code{cfgpath} does not exist.
@item EPERM
The calling process does not have the appropriate privilege to
modify the node indicated by the path prefix of the cfgpath
modify the node indicated by the path prefix of the @code{cfgpath}
argument.
@item EBUSY
@@ -542,7 +547,7 @@ The named node resides in a read-only configuration space.
@item ELOOP
A node appears more than once in the path specified by the
cfg-path argument.
@code{cfgpath} argument.
@item ELOOP
More than @code{SYMLOOP_MAX} symbolic links were encountered during
@@ -552,7 +557,7 @@ resolution of the cfgpath argument.
@subheading DESCRIPTION:
The @code{cfg_unlink} function removes the link between the node
The @code{cfg_unlink()} function removes the link between the node
specified by the @code{cfgpath} path prefix and the parent node
specified by @code{cfgpath}, and decrements the link count
of the @code{cfgpath} node.
@@ -588,6 +593,9 @@ int cfg_open(
@subheading STATUS CODES:
A successful call to @code{cfg_open()} returns a value of zero
and an unsuccessful call returns the @code{errno}.
@table @b
@item EACCES
Search permission is denied for any component of a pathname.
@@ -605,26 +613,26 @@ The pathname argument is an empty string or the named node
does not exist.
@item EINVAL
Either both or neither of CFG_LOGICAL and CFG_PHYSICAL are
specified by the options argument
Either both or neither of @code{CFG_LOGICAL} and @code{CFG_PHYSICAL} are
specified by the @code{options} argument
@item ENOMEM
Not enough memory is available to create the necessary structures.
@item ELOOP
More than @code{SYMLOOP_MAX} symbolic links were encountered during
resolution of the pathnames argument.
resolution of the @code{pathnames} argument.
@item ENAMETOOLONG
As a result of encountering a symbolic link in resolution of the
pathname specified by the pathnames argument, the length of
pathname specified by the @code{pathnames} argument, the length of
the substituted pathname string exceeded @code{PATH_MAX}.
@end table
@subheading DESCRIPTION:
The @code{cfg_open} function opens a configuration traversal stream
The @code{cfg_open()} function opens a configuration traversal stream
rooted in the configuration nodes name by the @code{pathnames} argument.
It stores a pointer to a CFG object that represents that stream at
the location identified the @code{cfgstream} pointer. The @code{pathnames}
@@ -669,7 +677,7 @@ instead of the link itself, unless the target node does
not exist. If the target node has children, the
pre-order return, followed by the return of structures
referencing all its descendants, followed by a post-order
return, shall be done.
return, is done.
@item CFG_XDEV
The configuration space functions do not return a
@@ -679,7 +687,7 @@ by the CFGENT structures for the @code{pathnames} argument.
@end table
The @code{cfg_open} argument @code{compar} is either a NULL or point
The @code{cfg_open()} argument @code{compar} is either a NULL or point
to a function that is called with two pointers to pointers to CFGENT
structures that returns less than, equal to , or greater than zero if
the node referenced by the first argument is considered to be respectively
@@ -691,9 +699,9 @@ described with the exception that the contents of the @code{cfg_path} and
This comparison routine is used to determine the order in which nodes in
directories encountered during the traversal are returned, and the order
of traversal when more than one node is specified in the @code{pathnames}
argument to @code{cfg_open}. If a comparison routine is specified, the
argument to @code{cfg_open()}. If a comparison routine is specified, the
order of traversal is from the least to the greatest. If the @code{compar}
argument is NULL, the order of traversal shall be as listed in the
argument is NULL, the order of traversal shall is listed in the
@code{pathnames} argument.
@subheading NOTES:
@@ -722,12 +730,15 @@ int cfg_read(
@subheading STATUS CODES:
A successful call to @code{cfg_read()} returns a value of zero
and an unsuccessful call returns the @code{errno}.
@table @b
@item EACCES
Search permission is denied for any component of a pathname.
@item EBADF
The cfgp argument does not refer to an open configuration
The @code{cfgp} argument does not refer to an open configuration
space.
@item ELOOP
@@ -735,7 +746,7 @@ A loop exists in symbolic links encountered during resolution
of a pathname.
@item ENOENT
A named node does not exist.
A named @code{node} does not exist.
@item ENOMEM
Not enough memory is available to create the necessary structures.
@@ -753,20 +764,20 @@ substituted pathname string exceeded @code{PATH_MATH}.
@subheading DESCRIPTION:
The @code{cfg_read} function returns a pointer to a CFGENT structure
The @code{cfg_read()} function returns a pointer to a CFGENT structure
representing a node in the configuration space to which @code{cfgp}
refers. The returned pointer is stored at the location indicated
by the @code{node} argument.
The child nodes of each node in the configuration tree is returned
by @code{cfg_read}. If a comparison routine is specified to the
@code{cfg_open} function, the order of return of the child nodes is
as specified by the routine, from least to greatest. Otherwise
the order of return is unspecified.
by @code{cfg_read()}. If a comparison routine was specified to the
@code{cfg_open()} function, the order of return of the child nodes is
as specified by the @code{compar} routine, from least to greatest.
Otherwise, the order of return is unspecified.
Structures referencing nodes with children is returned by the
function @code{cfg_read} at least twice [unless the application
specifies otherwise with @code{cfg_mark}]-once immediately before
function @code{cfg_read()} at least twice [unless the application
specifies otherwise with @code{cfg_mark()}]-once immediately before
the structures representing their descendants, are returned
(pre-order), and once immediately after structures representing all
of their descendants, if any, are returned (post-order). The
@@ -782,24 +793,24 @@ information:
@item cfg_parent
A pointer to the structure returned by the
@code{cfg_read} function for the node that contains
@code{cfg_read()} function for the node that contains
the entry for the current node. A @code{cfg_parent}
structure is provided for the node(s) specified by
the @code{pathnames} argument to the @code{cfg_open}
the @code{pathnames} argument to the @code{cfg_open()}
function, but the contents of other than its
@code{cfg_number}, @code{cfg_pointer}, @code{cfg_parent},
and @code{cfg_parent}, and @code{cfg_level} fields are
unspecified. Its @code{cfg_link} field is unspecified.
@item cfg_link
Upon return from the @code{cfg_children} function, the
Upon return from the @code{cfg_children()} function, the
@code{cfg_link} field points to the next CFGENT structure
in a NULL-terminated linked list of CFGENT structures.
Otherwise, the content of the @code{cfg_link} field is
unspecified.
@item cfg_cycle
If the structure being returned by @code{cfg_read}
If the structure being returned by @code{cfg_read()}
represents a node that appears in the @code{cfg_parent}
linked list tree, the @code{cfg_cycle} field shall point
to the structure representing that entry from the
@@ -809,20 +820,20 @@ the @code{cfg_cycle} field is unspecified.
@item cfg_number
The @code{cfg_number} field is provided for use by the
application program. It is initialized to zero for
each new node returned by the @code{cfg_read} function,
each new node returned by the @code{cfg_read()} function,
but is not further modified by the configuration space
routines.
@item cfg_pointer
The @code{cfg_pointer} field is provided for use by the
application program. It is initialized to NULL for
each new node returned by the @code{cfg_read} function,
each new node returned by the @code{cfg_read()} function,
but is not further modified by the configuration
space routines.
@item cfg_path
A pathname for the node including and relative to the
argument supplied to the @code{cfg_open} routine for this
argument supplied to the @code{cfg_open()} routine for this
configuration space. This pathname may be longer than
@code{PATH_MAX} bytes. This pathname is NULL-terminated.
@@ -831,7 +842,7 @@ The nodename of the node.
@item cfg_pathlen
The length of the string pointed at by the @code{cfg_path}
field when returned by @code{cfg_read}.
field when returned by @code{cfg_read()}.
@item cfg_namelen
The length of the string pointed at by the @code{cfg_name}
@@ -841,7 +852,7 @@ field.
The depth of the current entry in the configuration space.
The @code{cfg_level} field of the @code{cfg_parent}
structure for each of the node(s) specified in the
@code{pathnames} argument to the @code{cfg_open} function
@code{pathnames} argument to the @code{cfg_open()} function
is set to 0, and this number is incremented for each
node level descendant.
@@ -858,7 +869,7 @@ pre-order.
@item CFG_DC
The structure represents a node that is a parent
of the node most recently returned by @code{cfg_read}.
of the node most recently returned by @code{cfg_read()}.
The @code{cfg_cycle} field references the structure
previously returned by @code{cfg_read} that is the
same as the returned structure.
@@ -897,21 +908,21 @@ information cannot be obtained.
@end table
Structures returned by @code{cfg_read} with a @code{cfg_info} field equal
Structures returned by @code{cfg_read()} with a @code{cfg_info} field equal
to CFG_D is accessible until a subsequent call, on the same
configuration traversal stream, to @code{cfg_close}, or to @code{cfg_read}
configuration traversal stream, to @code{cfg_close()}, or to @code{cfg_read()}
after they have been returned by the @code{cfg_read} function in
post-order. Structures returned by @code{cfg_read} with an
post-order. Structures returned by @code{cfg_read()} with an
@code{cfg_info} field not equal to CFG_D is accessible until a subsequent
call, on the same configuration traversal stream, to @code{cfg_close}
or @code{cfg_read}.
call, on the same configuration traversal stream, to @code{cfg_close()}
or @code{cfg_read()}.
The content of the @code{cfg_path} field is specified only for the
structure most recently returned by @code{cfg_read}.
structure most recently returned by @code{cfg_read()}.
The specified fields in structures in the list representing nodes for
which structures have previously been returned by @code{cfg_children},
is identical to those returned by @code{cfg_children}, except that
which structures have previously been returned by @code{cfg_children()},
is identical to those returned by @code{cfg_children()}, except that
the contents of the @code{cfg_path} and @code{cfg_pathlen} fields are
unspecified.
@@ -942,12 +953,15 @@ int cfg_children(
@subheading STATUS CODES:
A successful call to @code{cfg_children()} returns a value of zero
and an unsuccessful call returns the @code{errno}.
@table @b
@item EACCES
Search permission is denied for any component of a pathname
@item EBADF
The cfgp argument does not refer to an open configuration space.
The @code{cfgp} argument does not refer to an open configuration space.
@item ELOOP
A loop exists in symbolic links encountered during resolution of
@@ -959,7 +973,7 @@ component is longer than @code{NAME_MAX} while @code{_POSIX_NO_TRUNC} is
in effect.
@item EINVAL
The specified value of the options argument is invalid.
The specified value of the @code{options} argument is invalid.
@item ENOENT
The named node does not exist.
@@ -971,20 +985,20 @@ Not enough memory is available to create the necessary structures.
@subheading DESCRIPTION:
The first @code{cfg_children} call after a @code{cfg_read} returns
The first @code{cfg_children()} call after a @code{cfg_read()} returns
information about the first node without children under the node
returned by @code{cfg_read}. Subsequent calls to @code{cfg_children}
without the intervening @code{cfg_read} shall return information
returned by @code{cfg_read()}. Subsequent calls to @code{cfg_children()}
without the intervening @code{cfg_read()} shall return information
about the remaining nodes without children under that same node.
If @code{cfg_read} has not yet been called for the configuration
traversal stream represented by @code{cfgp}, @code{cfg_children}
If @code{cfg_read()} has not yet been called for the configuration
traversal stream represented by @code{cfgp}, @code{cfg_children()}
returns a pointer to the first entry in a list of the nodes
represented by the @code{pathnames} argument to @code{cfg_open}.
represented by the @code{pathnames} argument to @code{cfg_open()}.
In either case, the list is NULL-terminated, ordered by the
user-specified comparison function, if any, and linked through the
cfg_link field.
@code{cfg_link} field.
@subheading NOTES:
@@ -1013,20 +1027,23 @@ int cfg_mark(
@subheading STATUS CODES:
A successful call to @code{cfg_mark()} returns a value of zero
and an unsuccessful call returns the @code{errno}.
@table @b
@item EINVAL
The specified combination of the cfgp and f arguments is not
The specified combination of the @code{cfgp} and @code{f} arguments is not
supported by the implementation.
@item EINVAL
The specified value of the options argument is invalid.
The specified value of the @code{options} argument is invalid.
@end table
@subheading DESCRIPTION:
The @code{cfg_mark} function modifies the subsequent behavior of
the cfg functions with regard to the node referenced by the structure
The @code{cfg_mark()} function modifies the subsequent behavior of
the @code{cfg} functions with regard to the node referenced by the structure
pointed to by the argument @code{f} or the configuration space referenced
by the structure pointed to by the argument @code{cfgp}.
@@ -1040,9 +1057,9 @@ specified in the following list:
@item CFG_AGAIN
If the @code{cfgp} argument is non-NULL, or the @code{f}
argument is NULL, or the structure referenced by @code{f}
is not the one most recently returned by @code{cfg_read},
@code{cfg_mark} returns an error. Otherwise, the next
call to the @code{cfg_read} function returns the structure
is not the one most recently returned by @code{cfg_read()},
@code{cfg_mark()} returns an error. Otherwise, the next
call to the @code{cfg_read()} function returns the structure
referenced by @code{f} with the @code{cfg_info} field
reinitialized. Subsequent behavior of the @code{cfg}
functions are based on the reinitialized value of
@@ -1053,17 +1070,17 @@ If the @code{cfgp} argument is non-NULL, or the @code{f}
argument is NULL, or the structure referenced by @code{f}
is not one of those specified as accessible, or the structure
referenced by @code{f} is not for a node of type pre-order
node, @code{cfg_mark} returns an error. Otherwise, no
node, @code{cfg_mark()} returns an error. Otherwise, no
more structures for the node referenced by @code{f} or its
descendants are returned by the @code{cfg_read} function.
descendants are returned by the @code{cfg_read()} function.
@item CFG_FOLLOW
If the @code{cfgp} argument is non-NULL, or the @code{f}
argument is NULL, or the structure referenced by @code{f}
is not one of those specified as accessible, or the structure
referenced by @code{f} is not for a node of type symbolic link,
@code{cfg_mark} returns an error. Otherwise, the next
call to the @code{cfg_read} function returns the structure
@code{cfg_mark()} returns an error. Otherwise, the next
call to the @code{cfg_read()} function returns the structure
referenced by @code{f} with the @code{cfg_info} field reset
to reflect the target of the symbolic link instead of the
symbolic link itself. If the target of the link is node with
@@ -1074,7 +1091,7 @@ post-order return, shall be done.
@end table
If the target of the symbolic link does not exist, the fields
of the structure by @code{cfg_read} shall be unmodified, except
of the structure by @code{cfg_read()} shall be unmodified, except
that the @code{cfg_info} field shall be reset to @code{CFG_SLNONE}.
@subheading NOTES:
@@ -1102,16 +1119,19 @@ int cfg_close(
@subheading STATUS CODES:
A successful call to @code{cfg_close()} returns a value of zero
and an unsuccessful call returns the @code{errno}.
@table @b
@item EBADF
The cfgp argument does not refer to an open configuration space
The @code{cfgp} argument does not refer to an open configuration space
traversal stream.
@end table
@subheading DESCRIPTION:
The @code{cfg_close} function closes a configuration space transversal
The @code{cfg_close()} function closes a configuration space transversal
stream represented by the CFG structure pointed at by the @code{cfgp}
argument. All system resources allocated for this configuration space
traversal stream should be deallocated. Upon return, the value of
@@ -1151,136 +1171,25 @@ Invalid file descriptor
@subheading DESCRIPTION:
The @code{cfg_readdir} function returns a pointer to a structure @code{dirent}
The @code{cfg_readdir()} function returns a pointer to a structure @code{dirent}
representing the next directory entry from the directory stream pointed to
by @code{dirp}. On end-of-file, NULL is returned.
The @code{cfg_readdir} function may (or may not) return entries for . or .. Your
The @code{cfg_readdir()} function may (or may not) return entries for . or .. Your
program should tolerate reading dot and dot-dot but not require them.
The data pointed to be @code{cfg_readdir} may be overwritten by another call to
@code{readdir} for the same directory stream. It will not be overwritten by
The data pointed to be @code{cfg_readdir()} may be overwritten by another call to
@code{readdir()} for the same directory stream. It will not be overwritten by
a call for another directory.
@subheading NOTES:
If ptr is not a pointer returned by @code{malloc}, @code{calloc}, or
@code{realloc} or has been deallocated with @code{free} or @code{realloc},
If @code{ptr} is not a pointer returned by @code{malloc()}, @code{calloc()}, or
@code{realloc()} or has been deallocated with @code{free()} or @code{realloc()},
the results are not portable and are probably disastrous.
@page
@subsection open - Opens a file
@subheading CALLING SEQUENCE:
@ifset is-C
@example
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
int open(
const char *path,
int oflag,
mode_t mode
);
@end example
@end ifset
@ifset is-Ada
@end ifset
@subheading STATUS CODES:
@table @b
@item EACCES
Search permission is denied for a directory in a file's path prefix
@item EEXIST
The named file already exists.
@item EINTR
Function was interrupted by a signal.
@item EISDIR
Attempt to open a directory for writing or to rename a file to be a
directory.
@item EMFILE
Too many file descriptors are in use by this process.
@item ENAMETOOLONG
Length of a filename string exceeds PATH_MAX and _POSIX_NO_TRUNC is in
effect.
@item ENFILE
Too many files are currently open in the system.
@item ENOENT
A file or directory does not exist.
@item ENOSPC
No space left on disk.
@item ENOTDIR
A component of the specified pathname was not a directory when a directory
was expected.
@item ENXIO
No such device. This error may also occur when a device is not ready, for
example, a tape drive is off-line.
@item EROFS
Read-only file system.
@end table
@subheading DESCRIPTION:
The @code{open} function establishes a connection between a file and a file
descriptor. The file descriptor is a small integer that is used by I/O
functions to reference the file. The @code{path} argument points to the
pathname for the file.
The @code{oflag} argument is the bitwise inclusive OR of the values of
symbolic constants. The programmer must specify exactly one of the following
three symbols:
@table @b
@item O_RDONLY
Open for reading only.
@item O_WRONLY
Open for writing only.
@item O_RDWR
Open for reading and writing.
@end table
Any combination of the following symbols may also be used.
@table @b
@item O_APPEND
Set the file offset to the end-of-file prior to each write.
@item O_CREAT
If the file does not exist, allow it to be created. This flag indicates
that the @code{mode} argument is present in the call to @code{open}.
@item O_EXCL
This flag may be used only if O_CREAT is also set. It causes the call
to @code{open} to fail if the file already exists.
@item O_NOCTTY
If @code{path} identifies a terminal, this flag prevents that teminal from
becoming the controlling terminal for thi9s process. See Chapter 8 for a
description of terminal I/O.
@item O_NONBLOCK
Do no wait for the device or file to be ready or available. After the file
is open, the @code{read} and @code{write} calls return immediately. If the
process would be delayed in the read or write opermation, -1 is returned and
@code{errno} is set to @code{EAGAIN} instead of blocking the caller.
@item O_TRUNC
This flag should be used only on ordinary files opened for writing. It
causes the file to be tuncated to zero length..
@end table
Upon successful completion, @code{open} returns a non-negative file
descriptor.
@subheading NOTES:
This function is not defined in the POSIX specification. It is an extension
provided by this implementation.
@page
@subsection cfg_umask - Sets a file creation mask.
@@ -1305,187 +1214,20 @@ mode_t cfg_umask(
@subheading DESCRIPTION:
The @code{cfg_umask} function sets the process file creation mask to @code{cmask}.
The file creation mask is used during @code{open}, @code{creat}, @code{mkdir},
@code{mkfifo} calls to turn off permission bits in the @code{mode} argument.
The @code{cfg_umask()} function sets the process node creation mask to @code{cmask}.
The file creation mask is used during @code{open()}, @code{creat()}, @code{mkdir()},
@code{mkfifo()} calls to turn off permission bits in the @code{mode} argument.
Bit positions that are set in @code{cmask} are cleared in the mode of the
created file.
The file creation mask is inherited across @code{fork} and @code{exec} calls.
The file creation mask is inherited across @code{fork()} and @code{exec()} calls.
This makes it possible to alter the default permission bits of created files.
@subheading NOTES:
@subheading NOTES: None
The @code{cmask} argument should have only permission bits set. All other
bits should be zero.
@page
@subsection link - Creates a link to a file
@subheading CALLING SEQUENCE:
@ifset is-C
@example
#include <unistd.h>
int link(
const char *existing,
const char *new
);
@end example
@end ifset
@ifset is-Ada
@end ifset
@subheading STATUS CODES:
@table @b
@item EACCES
Search permission is denied for a directory in a file's path prefix
@item EEXIST
The named file already exists.
@item EMLINK
The number of links would exceed @code{LINK_MAX}.
@item ENAMETOOLONG
Length of a filename string exceeds PATH_MAX and _POSIX_NO_TRUNC is in
effect.
@item ENOENT
A file or directory does not exist.
@item ENOSPC
No space left on disk.
@item ENOTDIR
A component of the specified pathname was not a directory when a directory
was expected.
@item EPERM
Operation is not permitted. Process does not have the appropriate priviledges
or permissions to perform the requested operations.
@item EROFS
Read-only file system.
@item EXDEV
Attempt to link a file to another file system.
@end table
@subheading DESCRIPTION:
The @code{link} function atomically creates a new link for an existing file
and increments the link count for the file.
If the @code{link} function fails, no directories are modified.
The @code{existing} argument should not be a directory.
The callder may (or may not) need permission to access the existing file.
@subheading NOTES:
@page
@subsection unlink - Removes a directory entry
@subheading CALLING SEQUENCE:
@ifset is-C
@example
#include <unistd.h>
int unlink(
const char path
);
@end example
@end ifset
@ifset is-Ada
@end ifset
@subheading STATUS CODES:
@table @b
@item EACCES
Search permission is denied for a directory in a file's path prefix
@item EBUSY
The directory is in use.
@item ENAMETOOLONG
Length of a filename string exceeds PATH_MAX and _POSIX_NO_TRUNC is in
effect.
@item ENOENT
A file or directory does not exist.
@item ENOTDIR
A component of the specified pathname was not a directory when a directory
was expected.
@item EPERM
Operation is not permitted. Process does not have the appropriate priviledges
or permissions to perform the requested operations.
@item EROFS
Read-only file system.
@end table
@subheading DESCRIPTION:
The @code{unlink} function removes the link named by @{code} and decrements the
link count of the file referenced by the link. When the link count goes to zero
and no process has the file open, the space occupied by the file is freed and the
file is no longer accessible.
@subheading NOTES:
@page
@subsection cfg_mkdir - Makes a directory
@subheading CALLING SEQUENCE:
@ifset is-C
@example
#include <sys/types.h>
#include <sys/stat.h>
int cfg_mkdir(
const char *path,
mode_t mode
);
@end example
@end ifset
@ifset is-Ada
@end ifset
@subheading STATUS CODES:
@table @b
@item EACCES
Search permission is denied for a directory in a file's path prefix
@item EEXIST
The name file already exist.
@item EMLINK
The number of links would exceed LINK_MAX
@item ENAMETOOLONG
Length of a filename string exceeds PATH_MAX and _POSIX_NO_TRUNC is in
effect.
@item ENOENT
A file or directory does not exist.
@item ENOSPC
No space left on disk.
@item ENOTDIR
A component of the specified pathname was not a directory when a directory
was expected.
@item EROFS
Read-only file system.
@end table
@subheading DESCRIPTION:
The @code{cfg_mkdir} function creates a new diectory named @code{path}. The
permission bits (modified by the file creation mask) are set from @code{mode}.
The owner and group IDs for the directory are set from the effective user ID
and group ID.
The new directory may (or may not) contain entries for. and .. but is otherwise
empty.
@subheading NOTES:
@page
@subsection cfg_chmod - Changes file mode.
@@ -1508,6 +1250,9 @@ int cfg_chmod(
@subheading STATUS CODES:
A successful call to @code{cfg_chmod()} returns a value of zero
and an unsuccessful call returns the @code{errno}.
@table @b
@item EACCES
Search permission is denied for a directory in a file's path prefix
@@ -1531,8 +1276,8 @@ Read-only file system.
Set the file permission bits, the set user ID bit, and the set group ID bit
for the file named by @code{path} to @code{mode}. If the effective user ID
does not match the owner of the file and the calling process does not have
the appropriate privileges, @code{cfg_chmod} returns -1 and sets @code{errno} to
does not match the owner of the node and the calling process does not have
the appropriate privileges, @code{cfg_chmod()} returns -1 and sets @code{errno} to
@code{EPERM}.
@subheading NOTES:
@@ -1560,6 +1305,9 @@ int cfg_chown(
@subheading STATUS CODES:
A successful call to @code{cfg_chown()} returns a value of zero
and an unsuccessful call returns the @code{errno}.
@table @b
@item EACCES
Search permission is denied for a directory in a file's path prefix
@@ -1591,7 +1339,7 @@ bits are cleared.
Some systems consider it a security violation to allow the owner of a file to
be changed, If users are billed for disk space usage, loaning a file to
another user could result in incorrect billing. The @code{cfg_chown} function
another user could result in incorrect billing. The @code{cfg_chown()} function
may be restricted to privileged users for some or all files. The group ID can
still be changed to one of the supplementary group IDs.