spawn.sgml

一套linux glib源代码

<!-- ##### SECTION Title ##### -->
Spawning Processes

<!-- ##### SECTION Short_Description ##### -->
process launching with <function>fork()</function>/<function>exec()</function>.

<!-- ##### SECTION Long_Description ##### -->
<para>

</para>

<!-- ##### SECTION See_Also ##### -->
<para>

</para>

<!-- ##### SECTION Stability_Level ##### -->


<!-- ##### ENUM GSpawnError ##### -->
<para>
Error codes returned by spawning processes.
</para>

@G_SPAWN_ERROR_FORK: Fork failed due to lack of memory.
@G_SPAWN_ERROR_READ: Read or select on pipes failed.
@G_SPAWN_ERROR_CHDIR: Changing to working directory failed.
@G_SPAWN_ERROR_ACCES: <function>execv()</function> returned %EACCES.
@G_SPAWN_ERROR_PERM: <function>execv()</function> returned %EPERM.
@G_SPAWN_ERROR_2BIG: <function>execv()</function> returned %E2BIG.
@G_SPAWN_ERROR_NOEXEC: <function>execv()</function> returned %ENOEXEC.
@G_SPAWN_ERROR_NAMETOOLONG: <function>execv()</function> returned %ENAMETOOLONG.
@G_SPAWN_ERROR_NOENT: <function>execv()</function> returned %ENOENT.
@G_SPAWN_ERROR_NOMEM: <function>execv()</function> returned %ENOMEM.
@G_SPAWN_ERROR_NOTDIR: <function>execv()</function> returned %ENOTDIR.
@G_SPAWN_ERROR_LOOP: <function>execv()</function> returned %ELOOP.
@G_SPAWN_ERROR_TXTBUSY: <function>execv()</function> returned %ETXTBUSY.
@G_SPAWN_ERROR_IO: <function>execv()</function> returned %EIO.
@G_SPAWN_ERROR_NFILE: <function>execv()</function> returned %ENFILE.
@G_SPAWN_ERROR_MFILE: <function>execv()</function> returned %EMFILE.
@G_SPAWN_ERROR_INVAL: <function>execv()</function> returned %EINVAL.
@G_SPAWN_ERROR_ISDIR: <function>execv()</function> returned %EISDIR.
@G_SPAWN_ERROR_LIBBAD: <function>execv()</function> returned %ELIBBAD.
@G_SPAWN_ERROR_FAILED: Some other fatal failure, <literal>error-&gt;message</literal> should explain.

<!-- ##### MACRO G_SPAWN_ERROR ##### -->
<para>
Error domain for spawning processes. Errors in this domain will
be from the #GSpawnError enumeration. See #GError for information on
error domains.
</para>



<!-- ##### ENUM GSpawnFlags ##### -->
<para>
Flags passed to g_spawn_sync(), g_spawn_async() and g_spawn_async_with_pipes().
</para>

@G_SPAWN_LEAVE_DESCRIPTORS_OPEN: the parent's open file descriptors will be 
 inherited by the child; otherwise all descriptors except stdin/stdout/stderr 
 will be closed before calling <function>exec()</function> in the child.
@G_SPAWN_DO_NOT_REAP_CHILD: the child will not be automatically reaped; you 
  must call <function>waitpid()</function> or handle <literal>SIGCHLD</literal> 
  yourself, or the child will become a zombie.
@G_SPAWN_SEARCH_PATH: <literal>argv[0]</literal> need not be an absolute path, 
  it will be looked for in the user's <envar>PATH</envar>.
@G_SPAWN_STDOUT_TO_DEV_NULL: the child's standad output will be discarded, 
  instead of going to the same location as the parent's standard output.
@G_SPAWN_STDERR_TO_DEV_NULL: the child's standard error will be discarded.
@G_SPAWN_CHILD_INHERITS_STDIN: the child will inherit the parent's standard 
  input (by default, the child's standard input is attached to 
  <filename>/dev/null</filename>).
@G_SPAWN_FILE_AND_ARGV_ZERO: the first element of <literal>argv</literal> is 
  the file to execute, while the remaining elements are the actual argument 
  vector to pass to the file. Normally g_spawn_async_with_pipes() uses 
  <literal>argv[0]</literal> as the file to execute, and passes all of 
  <literal>argv</literal> to the child.

<!-- ##### USER_FUNCTION GSpawnChildSetupFunc ##### -->
<para>
Specifies the type of the setup function passed to g_spawn_async(),
g_spawn_sync() and g_spawn_async_with_pipes(). On POSIX platforms it
is called in the child after GLib has performed all the setup it plans
to perform but before calling <function>exec()</function>. On POSIX
actions taken in this function will thus only affect the child, not
the parent.
</para>

<para>
On Windows the function is called in the parent. Its usefulness on
Windows is thus questionable. In many cases executing the child setup
function in the parent can have ill effects, and you should be very
careful when porting software to Windows that uses child setup
functions.
</para>

@user_data: user data to pass to the function.


<!-- ##### FUNCTION g_spawn_async_with_pipes ##### -->
<para>

</para>

@working_directory: 
@argv: 
@envp: 
@flags: 
@child_setup: 
@user_data: 
@child_pid: 
@standard_input: 
@standard_output: 
@standard_error: 
@error: 
@Returns: 


<!-- ##### FUNCTION g_spawn_async ##### -->
<para>

</para>

@working_directory: 
@argv: 
@envp: 
@flags: 
@child_setup: 
@user_data: 
@child_pid: 
@error: 
@Returns: 


<!-- ##### FUNCTION g_spawn_sync ##### -->
<para>

</para>

@working_directory: 
@argv: 
@envp: 
@flags: 
@child_setup: 
@user_data: 
@standard_output: 
@standard_error: 
@exit_status: 
@error: 
@Returns: 


<!-- ##### FUNCTION g_spawn_command_line_async ##### -->
<para>

</para>

@command_line: 
@error: 
@Returns: 


<!-- ##### FUNCTION g_spawn_command_line_sync ##### -->
<para>

</para>

@command_line: 
@standard_output: 
@standard_error: 
@exit_status: 
@error: 
@Returns: 


<!-- ##### FUNCTION g_spawn_close_pid ##### -->
<para>

</para>

@pid: