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The `pipe()` function takes no arguments and will return a two element
array containing open read- and write file descriptors for a newly
created pipe.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Expose the `isatty(3)` libc function in the fs module to allow checking
whether a file descriptor refers to a terminal.
Signed-off-by: Petr Štetiar <ynezz@true.cz>
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Expose the `realpath(3)` libc function in the fs module to allow for
canonicalizing file paths.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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When `fd.read()` is invoked with a single-character string argument,
invoke `getdelim()` internally to read the input until the give character
or EOF. This is useful for reading character delimited input data.
For example `fd.read('\n')` will read any data up to the first newline
(or EOF) while `fd.read('\0x00')` will read until the first null byte.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Use `getline()` instead of a custom `fgets()` wrapper logic to perform
line wise reads from open file handles. This is required to properly
deal with lines containing embedded null bytes.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Rework the `fs.open()` implementation to accept an optional third file
permission argument which is applied to newly created files.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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If the read limit passed to fs.readfile() is smaller than BUFSIZ then
disable stdio input buffering to avoid overreading the underlying file.
This is useful when reading small amounts of data from special files
such as /dev/urandom, where a readfile call limited to 16 bytes might
actually read 4096 due to stdio buffering.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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The `fs.readfile()` and `fs.writefile()` functions allow efficient reading
and writing of whole files, reducing the required boilerplace code compared
to using the `open()`/`read()`/`write()`/`close()` API.
- `fs.readfile()` takes two arguments; the path to open and an optional
limit value. If limit is omitted, `null` or negative, the entire file
contents are read, otherwise the specified amount of bytes. Returns the
read file contents as string or `null` on error.
- `fs.writefile()` takes three arguments; the path to open/create, the
contents to write and an optional limit value. If limit is omitted, the
entire content is written, otherwise just the specified amount of bytes.
Non-string content arguments are internally converted to strings, `null`
is treated as empty string. Returns the amount of bytes written or `null`
on error.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Make sure fs.dirname() doesn't truncate the last character of the
returned path. Previously ucv_string_new_length was called with a
length which no longer included the last character (which had just
been tested not to be a '/' or '.' and hence broke the loop at that
point).
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
[testcase added]
Signed-off-by: Paul Spooren <mail@aparcar.org>
[testcase folded into this commit and fixed]
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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It should be enough to include `sys/types.h` to obtain `major()` and
`minor()` definitions on OS X, so avoid including the the Linux specific
`sys/sysmacros.h` header in this case.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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The `access()` function allows testing the path given in the first argument
for accessibility according to the permissions specified in the second
mode string argument. The mode string characters may be `r`, `w`, `x` or
`f` which correspond to `R_OK` - path is readable, `W_OK` - path is
writable, `X_OK` - path is executable or `F_OK` - path exists respectively.
The `mkstemp()` function creates a secure temporary file, unlinks it and
returns the open file handle. The temporary path is constructed based on
the optional template argument. If the template argument contains a slash,
the path is taken as-is, if it contains no slashes, `/tmp/` is prepended.
If the template does not end with `XXXXXX`, a `.XXXXXX` suffix is appended
to the path. If the template is omitted, `/tmp/XXXXXX` is used.
The `file.flush()` and `proc.flush()` functions call `fflush()` on the
underlying file handle respectively. They take no arguments.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Implement support for opening existing file descriptors as well as acquiring
the descriptor number from open process and file handles.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Add three new functions `dirname()`, `basename()` and `lsdir()`.
The `basename()` and `dirname()` functions behave like their libc
counterparts and return the filename and directory portion of a
given path respectively. If the path argument is missing or not
a string, null is returned.
Examples:
dirname("/usr/lib") -> "/usr"
dirname("/usr/") -> "/"
dirname("usr") -> "."
dirname("/") -> "/"
dirname(".") -> "."
dirname("..") -> "."
basename("/usr/lib") -> "lib"
basename("/usr/") -> "usr"
basename("usr") -> "usr"
basename("/") -> "/"
basename(".") -> "."
basename("..") -> ".."
The `lsdir()` function returns a sorted array containing the names
of all entries within the given directory path, without the common
"." and ".." entries. If the given path is not a directory, cannot
be opened or if another system level occurs, null is returned and
`fs.error()` can be used to query details.
The function takes an optional second argument which may be either a
regular expression value or a string. In case a regular expression
is given, each directory entry is matched against it. In case a
string is provided, it is treated as wildcard (glob) pattern and
only directory entries matching the pattern are considered.
Examples:
lsdir("/sys/class/net") -> [ "eth0", "lo", "wlan0" ]
lsdir("/proc", /^[0-9]+$/) -> [ "1", "4", "12", ... ]
lsdir("/sys/class/block/", "sd?3") -> [ "sde3", "sdf3" ]
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Fix instances of misspelled "resource".
This commit breaks the exported libucode ABI.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Fixes: dfb7379 ("fs: implement chmod(), chown(), rename() and glob() functions")
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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- Ensure that most functions follow the subject_verb naming schema
- Move type related function from value.c to types.c
- Rename value.c to vallist.c
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Ensure that all custom typedef and vector declaration type names end with
a "_t" suffix.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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The naming is an artifact from before the introduction of the new type
system. In the current code, there is nothing special about prototypes,
they're simple object values.
Also introduce a new singular uc_add_function() convenience macro while
we're at it.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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- The chmod() function expects a path string as first and an integer mode
value as second argument.
- The chown() function takes a path string as first argument, and either
a string, an integer or null as second user and third group argument
respectively.
If either user or group are given as string, they're resolved to an
uid/gid using getpwnam()/getgrnam() internally. If either lookup fails,
the ownership change is not performed.
If either user or group are null or -1, they're left unchanged.
- The rename() function takes two path strings, the old path being the
first argument and the new path the second one.
- The glob() function takes an arbitrary number of glob patterns and
resolves matching files for each one. In case of multiple patterns,
no efforts are made to remove duplicates or to globally sort the combined
match list. The list of matches for each individual pattern is sorted.
Returns an array containing all matched file paths.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Instead of relying on json_object values internally, use custom types to
represent the different ucode value types which brings a number of
advantages compared to the previous approach:
- Due to the use of tagged pointers, small integer, string and bool
values can be stored directly in the pointer addresses, vastly
reducing required heap memory
- Ability to create circular data structures such as
`let o; o = { test: o };`
- Ability to register custom `tostring()` function through prototypes
- Initial mark/sweep GC implementation to tear down circular object
graphs on VM deinit
The change also paves the way for possible future extensions such as
constant variables and meta methods for custom ressource types.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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The fs.readlink() function incorrectly produced a JSON string containing
trailing null bytes.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Replace the former AST walking interpreter implementation with a single pass
bytecode compiler and a corresponding virtual machine.
The rewrite lays the groundwork for a couple of improvements with will be
subsequently implemented:
- Ability to precompile ucode sources into binary byte code
- Strippable debug information
- Reduced runtime memory usage
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Also handle calls to C functions.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Register prototype object directly together with the type instead of
setting it manually whenever an extended type value is instantiated.
This also allows freeing the various prototype objects in dlopened
modules.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Also introduce convenience macro for registering function arrays in modules.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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We need to clear the file handle pointer after closing the file
to avoid invoking the dtor later.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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- unify operand and value tag structures
- use a contiguous array for storing opcodes
- use relative offsets for next and children ops
- defer function creation to runtime
- rework "this" context handling by storing context pointer in scope tags
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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