unit-posix.html

Scheme跨平台编译器

current-user-id  current-group-id  current-effective-user-id  current-effective-groupd-id
set-user-id!  set-group-id!
create-session
process-group-id  set-process-group-id!
create-symbolic-link  read-symbolic-link
file-truncate
file-lock  file-lock/blocking  file-unlock  file-test-lock
create-fifo  fifo?
prot/...
map/...
map-file-to-memory  unmap-file-from-memory  memory-mapped-file-pointer  memory-mapped-file?
set-alarm!
terminal-port?  terminal-name
process-fork  process-signal
parent-process-id
set-root-directory!
utc-time-&gt;seconds</pre><a name="additional-definitions"></a><h3>Additional Definitions</h3><p>Only available for Windows</p><ul><li>open/noinherit</li></ul><p>This variable is a mode value for <tt>create-pipe</tt>. Useful when spawning a child process.</p><ul><li>spawn/overlay</li><li>spawn/wait</li><li>spawn/nowait</li><li>spawn/nowaito</li><li>spawn/detach</li></ul><p>These variables contains special flags that specify the exact semantics of <tt>process-spawn</tt>: <tt>spawn/overlay</tt> replaces the current process with the new one. <tt>spawn/wait</tt> suspends execution of the current process until the spawned process returns. <tt>spawn/nowait</tt> does the opposite (<tt>spawn/nowaito</tt> is identical, according to the Microsoft documentation) and runs the process asynchronously. <tt>spawn/detach</tt> runs the new process in the background, without being attached to a console.</p><a name="process-spawn"></a><h3>process-spawn</h3><pre>[procedure] (process-spawn MODE COMMAND [ARGUMENT-LIST [ENVIRONMENT-LIST [EXACT-FLAG]]])</pre><p>Creates and runs a new process with the given <tt>COMMAND</tt> filename and the optional <tt>ARGUMENT-LIST</tt> and <tt>ENVIRONMENT-LIST</tt>. <tt>MODE</tt> specifies how exactly the process should be executed and must be one or more of the <tt>spawn/...</tt> flags defined above.</p><p>The <tt>EXACT-FLAG</tt>, default <tt>#f</tt>, controls quote-wrapping of argument strings. When <tt>#t</tt> quote-wrapping is not performed.</p><p>Returns:</p><ul><li>the exit status when synchronous</li><li>the PID when asynchronous</li><li>-1 when failure</li></ul><p>Previous: <a href="unit-srfi-18.html" class="internal">Unit srfi-18</a></p><p>Next: <a href="unit-utils.html" class="internal">Unit utils</a></p>
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