/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 8 -*- * * Copyright (C) 2007 William Jon McCann * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. * */ #include "config.h" #include #include #include #include #include #include #include #include #include #include #include #include #include "ck-job.h" #include "ck-marshal.h" #define CK_JOB_GET_PRIVATE(o) (G_TYPE_INSTANCE_GET_PRIVATE ((o), CK_TYPE_JOB, CkJobPrivate)) struct CkJobPrivate { guint err_watch_id; guint out_watch_id; char *command; GString *std_out; GString *std_err; GPid child_pid; }; enum { COMPLETED, LAST_SIGNAL }; static guint signals [LAST_SIGNAL] = { 0, }; static void ck_job_class_init (CkJobClass *klass); static void ck_job_init (CkJob *job); static void ck_job_finalize (GObject *object); G_DEFINE_TYPE (CkJob, ck_job, G_TYPE_OBJECT) GQuark ck_job_error_quark (void) { static GQuark ret = 0; if (ret == 0) { ret = g_quark_from_static_string ("ck_job_error"); } return ret; } static int wait_on_child (int pid) { int status; wait_again: if (waitpid (pid, &status, 0) < 0) { if (errno == EINTR) { goto wait_again; } else if (errno == ECHILD) { ; /* do nothing, child already reaped */ } else { g_debug ("waitpid () should not fail"); } } return status; } static int wait_on_job (CkJob *job) { int status; status = wait_on_child (job->priv->child_pid); g_spawn_close_pid (job->priv->child_pid); job->priv->child_pid = 0; return WEXITSTATUS(status); } static void maybe_complete_job (CkJob *job) { if (job->priv->out_watch_id == 0 && job->priv->err_watch_id == 0) { int status; status = wait_on_job (job); g_debug ("Emitting completed"); g_signal_emit (job, signals [COMPLETED], 0, status); } } static gboolean error_watch (GIOChannel *source, GIOCondition condition, CkJob *job) { gboolean finished = FALSE; if (condition & G_IO_IN) { GIOStatus status; GError *error = NULL; char *line; line = NULL; status = g_io_channel_read_line (source, &line, NULL, NULL, &error); switch (status) { case G_IO_STATUS_NORMAL: g_debug ("command error output: %s", line); g_string_append (job->priv->std_err, line); break; case G_IO_STATUS_EOF: finished = TRUE; break; case G_IO_STATUS_ERROR: finished = TRUE; g_debug ("Error reading from child: %s\n", error->message); break; case G_IO_STATUS_AGAIN: default: break; } g_free (line); } else if (condition & G_IO_HUP) { finished = TRUE; } if (finished) { job->priv->err_watch_id = 0; maybe_complete_job (job); return FALSE; } return TRUE; } static gboolean out_watch (GIOChannel *source, GIOCondition condition, CkJob *job) { gboolean finished = FALSE; if (condition & G_IO_IN) { GIOStatus status; GError *error = NULL; char *line; line = NULL; status = g_io_channel_read_line (source, &line, NULL, NULL, &error); switch (status) { case G_IO_STATUS_NORMAL: g_string_append (job->priv->std_out, line); break; case G_IO_STATUS_EOF: finished = TRUE; break; case G_IO_STATUS_ERROR: finished = TRUE; g_debug ("Error reading from child: %s\n", error->message); break; case G_IO_STATUS_AGAIN: default: break; } g_free (line); } else if (condition & G_IO_HUP) { finished = TRUE; } if (finished) { job->priv->out_watch_id = 0; maybe_complete_job (job); return FALSE; } return TRUE; } gboolean ck_job_execute (CkJob *job, GError **error) { GError *local_error; gboolean res; GIOChannel *channel; int standard_output; int standard_error; int argc; char **argv; g_debug ("Executing %s", job->priv->command); local_error = NULL; if (! g_shell_parse_argv (job->priv->command, &argc, &argv, &local_error)) { g_debug ("Could not parse command: %s", local_error->message); g_propagate_error (error, local_error); return FALSE; } local_error = NULL; res = g_spawn_async_with_pipes (NULL, argv, NULL, G_SPAWN_DO_NOT_REAP_CHILD, NULL, NULL, &job->priv->child_pid, NULL, &standard_output, &standard_error, &local_error); g_strfreev (argv); if (! res) { g_debug ("Could not start command '%s': %s", job->priv->command, local_error->message); g_propagate_error (error, local_error); return FALSE; } /* output channel */ channel = g_io_channel_unix_new (standard_output); g_io_channel_set_close_on_unref (channel, TRUE); g_io_channel_set_flags (channel, g_io_channel_get_flags (channel) | G_IO_FLAG_NONBLOCK, NULL); job->priv->out_watch_id = g_io_add_watch (channel, G_IO_IN | G_IO_HUP | G_IO_ERR | G_IO_NVAL, (GIOFunc)out_watch, job); g_io_channel_unref (channel); /* error channel */ channel = g_io_channel_unix_new (standard_error); g_io_channel_set_close_on_unref (channel, TRUE); g_io_channel_set_flags (channel, g_io_channel_get_flags (channel) | G_IO_FLAG_NONBLOCK, NULL); job->priv->err_watch_id = g_io_add_watch (channel, G_IO_IN | G_IO_HUP | G_IO_ERR | G_IO_NVAL, (GIOFunc)error_watch, job); g_io_channel_unref (channel); return res; } gboolean ck_job_get_stdout (CkJob *job, char **std_outp) { if (std_outp != NULL) { *std_outp = g_strdup (job->priv->std_out->str); } return TRUE; } gboolean ck_job_set_command (CkJob *job, const char *command) { g_free (job->priv->command); job->priv->command = g_strdup (command); return TRUE; } gboolean ck_job_get_command (CkJob *job, char **command) { if (command != NULL) { *command = g_strdup (job->priv->command); } return TRUE; } static void ck_job_class_init (CkJobClass *klass) { GObjectClass *object_class = G_OBJECT_CLASS (klass); object_class->finalize = ck_job_finalize; signals [COMPLETED] = g_signal_new ("completed", G_TYPE_FROM_CLASS (object_class), G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (CkJobClass, completed), NULL, NULL, g_cclosure_marshal_VOID__INT, G_TYPE_NONE, 1, G_TYPE_INT); g_type_class_add_private (klass, sizeof (CkJobPrivate)); } static void ck_job_init (CkJob *job) { job->priv = CK_JOB_GET_PRIVATE (job); job->priv->std_err = g_string_new (NULL); job->priv->std_out = g_string_new (NULL); } gboolean ck_job_cancel (CkJob *job) { if (job->priv->child_pid > 0) { kill (job->priv->child_pid, SIGTERM); wait_on_job (job); return TRUE; } return FALSE; } static void ck_job_finalize (GObject *object) { CkJob *job; g_debug ("Finalizing job"); g_return_if_fail (object != NULL); g_return_if_fail (CK_IS_JOB (object)); job = CK_JOB (object); g_return_if_fail (job->priv != NULL); ck_job_cancel (job); if (job->priv->out_watch_id > 0) { g_source_remove (job->priv->out_watch_id); job->priv->out_watch_id = 0; } if (job->priv->err_watch_id > 0) { g_source_remove (job->priv->err_watch_id); job->priv->err_watch_id = 0; } g_free (job->priv->command); g_string_free (job->priv->std_out, TRUE); g_string_free (job->priv->std_err, TRUE); G_OBJECT_CLASS (ck_job_parent_class)->finalize (object); } CkJob * ck_job_new (void) { GObject *object; object = g_object_new (CK_TYPE_JOB, NULL); return CK_JOB (object); }