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synced 2025-01-12 15:36:17 +01:00
gsubprocess: Use new source/target FD mapping functionality in g_spawn()
This improves performance by eliminating the use of a `GSpawnChildSetupFunc` in the common case (since that setup code has now moved into `g_spawn*()` itself), and enables the use of the fix to avoid the child error reporting FD being overwritten by target FD mappings, introduced via `g_spawn_async_with_pipes_and_fds()`. It reworks how the source/target FD mapping is stored within `GSubprocessLauncher` to match what `g_spawn*()` uses. The two approaches are equivalent. Signed-off-by: Philip Withnall <pwithnall@endlessos.org> Fixes: #2097
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@ -179,160 +179,6 @@ enum
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N_PROPS
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};
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#ifdef G_OS_UNIX
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typedef struct
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{
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gint fds[3];
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GSpawnChildSetupFunc child_setup_func;
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gpointer child_setup_data;
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GArray *basic_fd_assignments;
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GArray *needdup_fd_assignments;
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} ChildData;
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static void
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unset_cloexec (int fd)
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{
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int flags;
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int result;
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flags = fcntl (fd, F_GETFD, 0);
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if (flags != -1)
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{
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int errsv;
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flags &= (~FD_CLOEXEC);
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do
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{
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result = fcntl (fd, F_SETFD, flags);
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errsv = errno;
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}
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while (result == -1 && errsv == EINTR);
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}
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}
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static int
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dupfd_cloexec (int parent_fd)
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{
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int fd, errsv;
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#ifdef F_DUPFD_CLOEXEC
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do
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{
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fd = fcntl (parent_fd, F_DUPFD_CLOEXEC, 3);
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errsv = errno;
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}
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while (fd == -1 && errsv == EINTR);
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#else
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/* OS X Snow Lion and earlier don't have F_DUPFD_CLOEXEC:
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* https://bugzilla.gnome.org/show_bug.cgi?id=710962
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*/
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int result, flags;
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do
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{
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fd = fcntl (parent_fd, F_DUPFD, 3);
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errsv = errno;
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}
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while (fd == -1 && errsv == EINTR);
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flags = fcntl (fd, F_GETFD, 0);
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if (flags != -1)
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{
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flags |= FD_CLOEXEC;
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do
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{
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result = fcntl (fd, F_SETFD, flags);
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errsv = errno;
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}
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while (result == -1 && errsv == EINTR);
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}
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#endif
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return fd;
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}
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/*
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* Based on code derived from
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* gnome-terminal:src/terminal-screen.c:terminal_screen_child_setup(),
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* used under the LGPLv2+ with permission from author.
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*/
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static void
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child_setup (gpointer user_data)
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{
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ChildData *child_data = user_data;
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guint i;
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gint result;
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int errsv;
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/* We're on the child side now. "Rename" the file descriptors in
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* child_data.fds[] to stdin/stdout/stderr.
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*
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* We don't close the originals. It's possible that the originals
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* should not be closed and if they should be closed then they should
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* have been created O_CLOEXEC.
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*/
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for (i = 0; i < 3; i++)
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if (child_data->fds[i] != -1 && child_data->fds[i] != (gint) i)
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{
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do
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{
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result = dup2 (child_data->fds[i], i);
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errsv = errno;
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}
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while (result == -1 && errsv == EINTR);
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}
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/* Basic fd assignments we can just unset FD_CLOEXEC */
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if (child_data->basic_fd_assignments)
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{
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for (i = 0; i < child_data->basic_fd_assignments->len; i++)
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{
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gint fd = g_array_index (child_data->basic_fd_assignments, int, i);
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unset_cloexec (fd);
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}
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}
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/* If we're doing remapping fd assignments, we need to handle
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* the case where the user has specified e.g.:
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* 5 -> 4, 4 -> 6
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*
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* We do this by duping the source fds temporarily.
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*/
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if (child_data->needdup_fd_assignments)
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{
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for (i = 0; i < child_data->needdup_fd_assignments->len; i += 2)
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{
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gint parent_fd = g_array_index (child_data->needdup_fd_assignments, int, i);
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gint new_parent_fd;
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new_parent_fd = dupfd_cloexec (parent_fd);
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g_array_index (child_data->needdup_fd_assignments, int, i) = new_parent_fd;
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}
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for (i = 0; i < child_data->needdup_fd_assignments->len; i += 2)
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{
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gint parent_fd = g_array_index (child_data->needdup_fd_assignments, int, i);
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gint child_fd = g_array_index (child_data->needdup_fd_assignments, int, i+1);
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if (parent_fd == child_fd)
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{
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unset_cloexec (parent_fd);
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}
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else
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{
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do
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{
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result = dup2 (parent_fd, child_fd);
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errsv = errno;
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}
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while (result == -1 && errsv == EINTR);
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(void) close (parent_fd);
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}
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}
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}
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if (child_data->child_setup_func)
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child_data->child_setup_func (child_data->child_setup_data);
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}
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#endif
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static GInputStream *
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platform_input_stream_from_spawn_fd (gint fd)
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{
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@ -450,12 +296,12 @@ initable_init (GInitable *initable,
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GError **error)
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{
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GSubprocess *self = G_SUBPROCESS (initable);
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#ifdef G_OS_UNIX
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ChildData child_data = { { -1, -1, -1 }, 0, NULL, NULL, NULL };
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#endif
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gint *pipe_ptrs[3] = { NULL, NULL, NULL };
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gint pipe_fds[3] = { -1, -1, -1 };
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gint close_fds[3] = { -1, -1, -1 };
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#ifdef G_OS_UNIX
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gint stdin_fd = -1, stdout_fd = -1, stderr_fd = -1;
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#endif
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GSpawnFlags spawn_flags = 0;
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gboolean success = FALSE;
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gint i;
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@ -480,11 +326,11 @@ initable_init (GInitable *initable,
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else if (self->launcher)
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{
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if (self->launcher->stdin_fd != -1)
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child_data.fds[0] = self->launcher->stdin_fd;
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stdin_fd = self->launcher->stdin_fd;
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else if (self->launcher->stdin_path != NULL)
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{
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child_data.fds[0] = close_fds[0] = unix_open_file (self->launcher->stdin_path, O_RDONLY, error);
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if (child_data.fds[0] == -1)
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stdin_fd = close_fds[0] = unix_open_file (self->launcher->stdin_path, O_RDONLY, error);
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if (stdin_fd == -1)
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goto out;
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}
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}
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@ -499,11 +345,11 @@ initable_init (GInitable *initable,
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else if (self->launcher)
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{
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if (self->launcher->stdout_fd != -1)
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child_data.fds[1] = self->launcher->stdout_fd;
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stdout_fd = self->launcher->stdout_fd;
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else if (self->launcher->stdout_path != NULL)
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{
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child_data.fds[1] = close_fds[1] = unix_open_file (self->launcher->stdout_path, O_CREAT | O_WRONLY, error);
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if (child_data.fds[1] == -1)
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stdout_fd = close_fds[1] = unix_open_file (self->launcher->stdout_path, O_CREAT | O_WRONLY, error);
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if (stdout_fd == -1)
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goto out;
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}
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}
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@ -516,29 +362,21 @@ initable_init (GInitable *initable,
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pipe_ptrs[2] = &pipe_fds[2];
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#ifdef G_OS_UNIX
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else if (self->flags & G_SUBPROCESS_FLAGS_STDERR_MERGE)
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/* This will work because stderr gets setup after stdout. */
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child_data.fds[2] = 1;
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/* This will work because stderr gets set up after stdout. */
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stderr_fd = 1;
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else if (self->launcher)
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{
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if (self->launcher->stderr_fd != -1)
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child_data.fds[2] = self->launcher->stderr_fd;
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stderr_fd = self->launcher->stderr_fd;
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else if (self->launcher->stderr_path != NULL)
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{
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child_data.fds[2] = close_fds[2] = unix_open_file (self->launcher->stderr_path, O_CREAT | O_WRONLY, error);
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if (child_data.fds[2] == -1)
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stderr_fd = close_fds[2] = unix_open_file (self->launcher->stderr_path, O_CREAT | O_WRONLY, error);
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if (stderr_fd == -1)
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goto out;
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}
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}
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#endif
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#ifdef G_OS_UNIX
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if (self->launcher)
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{
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child_data.basic_fd_assignments = self->launcher->basic_fd_assignments;
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child_data.needdup_fd_assignments = self->launcher->needdup_fd_assignments;
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}
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#endif
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/* argv0 has no '/' in it? We better do a PATH lookup. */
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if (strchr (self->argv[0], G_DIR_SEPARATOR) == NULL)
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{
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@ -554,23 +392,25 @@ initable_init (GInitable *initable,
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spawn_flags |= G_SPAWN_DO_NOT_REAP_CHILD;
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spawn_flags |= G_SPAWN_CLOEXEC_PIPES;
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success = g_spawn_async_with_pipes_and_fds (self->launcher ? self->launcher->cwd : NULL,
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(const gchar * const *) self->argv,
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(const gchar * const *) (self->launcher ? self->launcher->envp : NULL),
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spawn_flags,
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#ifdef G_OS_UNIX
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child_data.child_setup_func = self->launcher ? self->launcher->child_setup_func : NULL;
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child_data.child_setup_data = self->launcher ? self->launcher->child_setup_user_data : NULL;
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#endif
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success = g_spawn_async_with_pipes (self->launcher ? self->launcher->cwd : NULL,
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self->argv,
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self->launcher ? self->launcher->envp : NULL,
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spawn_flags,
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#ifdef G_OS_UNIX
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child_setup, &child_data,
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self->launcher ? self->launcher->child_setup_func : NULL,
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self->launcher ? self->launcher->child_setup_user_data : NULL,
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stdin_fd, stdout_fd, stderr_fd,
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self->launcher ? (const gint *) self->launcher->source_fds->data : NULL,
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self->launcher ? (const gint *) self->launcher->target_fds->data : NULL,
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self->launcher ? self->launcher->source_fds->len : 0,
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#else
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NULL, NULL,
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NULL, NULL,
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-1, -1, -1,
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NULL, NULL, 0,
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#endif
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&self->pid,
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pipe_ptrs[0], pipe_ptrs[1], pipe_ptrs[2],
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error);
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&self->pid,
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pipe_ptrs[0], pipe_ptrs[1], pipe_ptrs[2],
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error);
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g_assert (success == (self->pid != 0));
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{
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gint stderr_fd;
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gchar *stderr_path;
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GArray *basic_fd_assignments;
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GArray *needdup_fd_assignments;
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GArray *source_fds;
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GArray *target_fds; /* always the same length as source_fds */
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gboolean closed_fd;
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GSpawnChildSetupFunc child_setup_func;
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@ -164,8 +164,8 @@ g_subprocess_launcher_init (GSubprocessLauncher *self)
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self->stdin_fd = -1;
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self->stdout_fd = -1;
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self->stderr_fd = -1;
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self->basic_fd_assignments = g_array_new (FALSE, 0, sizeof (int));
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self->needdup_fd_assignments = g_array_new (FALSE, 0, sizeof (int));
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self->source_fds = g_array_new (FALSE, 0, sizeof (int));
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self->target_fds = g_array_new (FALSE, 0, sizeof (int));
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#endif
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}
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@ -613,18 +613,10 @@ g_subprocess_launcher_take_fd (GSubprocessLauncher *self,
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gint source_fd,
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gint target_fd)
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{
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if (source_fd == target_fd)
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if (self->source_fds != NULL && self->target_fds != NULL)
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{
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if (self->basic_fd_assignments)
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g_array_append_val (self->basic_fd_assignments, source_fd);
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}
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else
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{
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if (self->needdup_fd_assignments)
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{
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g_array_append_val (self->needdup_fd_assignments, source_fd);
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g_array_append_val (self->needdup_fd_assignments, target_fd);
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}
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g_array_append_val (self->source_fds, source_fd);
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g_array_append_val (self->target_fds, target_fd);
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}
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}
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@ -664,17 +656,18 @@ g_subprocess_launcher_close (GSubprocessLauncher *self)
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close (self->stderr_fd);
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self->stderr_fd = -1;
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if (self->basic_fd_assignments)
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if (self->source_fds)
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{
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for (i = 0; i < self->basic_fd_assignments->len; i++)
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(void) close (g_array_index (self->basic_fd_assignments, int, i));
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g_clear_pointer (&self->basic_fd_assignments, g_array_unref);
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}
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if (self->needdup_fd_assignments)
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{
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for (i = 0; i < self->needdup_fd_assignments->len; i += 2)
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(void) close (g_array_index (self->needdup_fd_assignments, int, i));
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g_clear_pointer (&self->needdup_fd_assignments, g_array_unref);
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g_assert (self->target_fds != NULL);
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g_assert (self->source_fds->len == self->target_fds->len);
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for (i = 0; i < self->source_fds->len; i++)
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{
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(void) close (g_array_index (self->source_fds, int, i));
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(void) close (g_array_index (self->target_fds, int, i));
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}
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g_clear_pointer (&self->source_fds, g_array_unref);
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g_clear_pointer (&self->target_fds, g_array_unref);
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}
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self->closed_fd = TRUE;
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