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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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<title>UNIX-specific utilities and integration: GLib Reference Manual</title>
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<link rel="up" href="glib-utilities.html" title="GLib Utilities">
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<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
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Description
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UNIX-specific utilities and integration
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UNIX-specific utilities and integration — pipes, signal handling
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Functions
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gboolean
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g_unix_open_pipe ()
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gboolean
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g_unix_set_fd_nonblocking ()
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guint
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g_unix_signal_add ()
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guint
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g_unix_signal_add_full ()
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GSource *
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g_unix_signal_source_new ()
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gboolean
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(*GUnixFDSourceFunc) ()
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guint
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g_unix_fd_add ()
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guint
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g_unix_fd_add_full ()
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GSource *
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g_unix_fd_source_new ()
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Types and Values
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#define
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G_UNIX_ERROR
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Includes
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#include <glib-unix.h>
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Description
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Most of GLib is intended to be portable; in contrast, this set of
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functions is designed for programs which explicitly target UNIX,
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or are using it to build higher level abstractions which would be
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conditionally compiled if the platform matches G_OS_UNIX.
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To use these functions, you must explicitly include the
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"glib-unix.h" header.
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Functions
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g_unix_open_pipe ()
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gboolean
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g_unix_open_pipe (gint *fds,
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gint flags,
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GError **error);
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Similar to the UNIX pipe() call, but on modern systems like Linux
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uses the pipe2() system call, which atomically creates a pipe with
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the configured flags. The only supported flag currently is
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FD_CLOEXEC. If for example you want to configure O_NONBLOCK, that
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must still be done separately with fcntl().
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This function does not take O_CLOEXEC, it takes FD_CLOEXEC as if
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for fcntl(); these are different on Linux/glibc.
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Parameters
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fds
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Array of two integers
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flags
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Bitfield of file descriptor flags, as for fcntl()
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error
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a GError
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Returns
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TRUE on success, FALSE if not (and errno will be set).
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Since: 2.30
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g_unix_set_fd_nonblocking ()
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gboolean
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g_unix_set_fd_nonblocking (gint fd,
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gboolean nonblock,
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GError **error);
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Control the non-blocking state of the given file descriptor,
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according to nonblock
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. On most systems this uses O_NONBLOCK, but
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on some older ones may use O_NDELAY.
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Parameters
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fd
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A file descriptor
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nonblock
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If TRUE, set the descriptor to be non-blocking
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error
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a GError
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Returns
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TRUE if successful
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Since: 2.30
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g_unix_signal_add ()
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guint
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g_unix_signal_add (gint signum,
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GSourceFunc handler,
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gpointer user_data);
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A convenience function for g_unix_signal_source_new(), which
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attaches to the default GMainContext. You can remove the watch
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using g_source_remove().
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Parameters
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signum
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Signal number
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handler
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Callback
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user_data
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Data for handler
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Returns
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An ID (greater than 0) for the event source
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Since: 2.30
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g_unix_signal_add_full ()
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guint
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g_unix_signal_add_full (gint priority,
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gint signum,
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GSourceFunc handler,
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gpointer user_data,
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GDestroyNotify notify);
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A convenience function for g_unix_signal_source_new(), which
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attaches to the default GMainContext. You can remove the watch
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using g_source_remove().
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[rename-to g_unix_signal_add]
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Parameters
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priority
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the priority of the signal source. Typically this will be in
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the range between G_PRIORITY_DEFAULT and G_PRIORITY_HIGH.
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signum
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Signal number
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handler
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Callback
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user_data
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Data for handler
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notify
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GDestroyNotify for handler
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Returns
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An ID (greater than 0) for the event source
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Since: 2.30
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g_unix_signal_source_new ()
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GSource *
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g_unix_signal_source_new (gint signum);
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Create a GSource that will be dispatched upon delivery of the UNIX
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signal signum
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. In GLib versions before 2.36, only SIGHUP, SIGINT,
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SIGTERM can be monitored. In GLib 2.36, SIGUSR1 and SIGUSR2
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were added. In GLib 2.54, SIGWINCH was added.
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Note that unlike the UNIX default, all sources which have created a
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watch will be dispatched, regardless of which underlying thread
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invoked g_unix_signal_source_new().
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For example, an effective use of this function is to handle SIGTERM
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cleanly; flushing any outstanding files, and then calling
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g_main_loop_quit(). It is not safe to do any of this a regular
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UNIX signal handler; your handler may be invoked while malloc() or
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another library function is running, causing reentrancy if you
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attempt to use it from the handler. None of the GLib/GObject API
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is safe against this kind of reentrancy.
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The interaction of this source when combined with native UNIX
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functions like sigprocmask() is not defined.
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The source will not initially be associated with any GMainContext
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and must be added to one with g_source_attach() before it will be
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executed.
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Parameters
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signum
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A signal number
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Returns
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A newly created GSource
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Since: 2.30
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GUnixFDSourceFunc ()
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gboolean
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(*GUnixFDSourceFunc) (gint fd,
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GIOCondition condition,
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gpointer user_data);
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The type of functions to be called when a UNIX fd watch source
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triggers.
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Parameters
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fd
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the fd that triggered the event
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condition
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the IO conditions reported on fd
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user_data
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user data passed to g_unix_fd_add()
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Returns
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FALSE if the source should be removed
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g_unix_fd_add ()
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guint
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g_unix_fd_add (gint fd,
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GIOCondition condition,
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GUnixFDSourceFunc function,
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gpointer user_data);
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Sets a function to be called when the IO condition, as specified by
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condition
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becomes true for fd
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.
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function
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will be called when the specified IO condition becomes
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TRUE. The function is expected to clear whatever event caused the
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IO condition to become true and return TRUE in order to be notified
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when it happens again. If function
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returns FALSE then the watch
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will be cancelled.
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The return value of this function can be passed to g_source_remove()
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to cancel the watch at any time that it exists.
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The source will never close the fd -- you must do it yourself.
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Parameters
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fd
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a file descriptor
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condition
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IO conditions to watch for on fd
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function
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a GUnixFDSourceFunc
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user_data
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data to pass to function
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Returns
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the ID (greater than 0) of the event source
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Since: 2.36
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g_unix_fd_add_full ()
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guint
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g_unix_fd_add_full (gint priority,
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gint fd,
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GIOCondition condition,
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GUnixFDSourceFunc function,
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gpointer user_data,
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GDestroyNotify notify);
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Sets a function to be called when the IO condition, as specified by
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condition
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becomes true for fd
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.
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This is the same as g_unix_fd_add(), except that it allows you to
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specify a non-default priority and a provide a GDestroyNotify for
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user_data
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.
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Parameters
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priority
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the priority of the source
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fd
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a file descriptor
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condition
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IO conditions to watch for on fd
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function
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a GUnixFDSourceFunc
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user_data
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data to pass to function
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notify
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function to call when the idle is removed, or NULL
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Returns
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the ID (greater than 0) of the event source
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Since: 2.36
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g_unix_fd_source_new ()
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GSource *
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g_unix_fd_source_new (gint fd,
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GIOCondition condition);
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Creates a GSource to watch for a particular IO condition on a file
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descriptor.
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The source will never close the fd -- you must do it yourself.
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Parameters
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fd
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a file descriptor
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condition
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IO conditions to watch for on fd
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Returns
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the newly created GSource
|
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Since: 2.36
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Types and Values
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G_UNIX_ERROR
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#define G_UNIX_ERROR (g_unix_error_quark())
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Error domain for API in the g_unix_ namespace. Note that there is no
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exported enumeration mapping errno. Instead, all functions ensure that
|
|
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errno is relevant. The code for all G_UNIX_ERROR is always 0, and the
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error message is always generated via g_strerror().
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|
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It is expected that most code will not look at errno from these APIs.
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Important cases where one would want to differentiate between errors are
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|
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already covered by existing cross-platform GLib API, such as e.g. GFile
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wrapping ENOENT. However, it is provided for completeness, at least.
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Generated by GTK-Doc V1.27
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</body>
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</html>
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