android: posix_spawn(p) replacement

Signed-off-by: wm4 <wm4@nowhere>

osdep/android/posix-spawn.c

@@ -0,0 +1,72 @@
+/*
+ * posix-spawn replacement for Android
+ *
+ * This file is part of mpv.
+ *
+ * mpv is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * mpv 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with mpv.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <unistd.h>
+#include <errno.h>
+#include "osdep/android/posix-spawn.h"
+
+int posix_spawn_file_actions_adddup2(posix_spawn_file_actions_t *fa, int fd, int newfd)
+{
+    if (fa->used >= MAX_FILE_ACTIONS)
+        return -1;
+    fa->action[fa->used].filedes = fd;
+    fa->action[fa->used].newfiledes = newfd;
+    fa->used++;
+    return 0;
+}
+
+int posix_spawn_file_actions_init(posix_spawn_file_actions_t *fa)
+{
+    fa->used = 0;
+    return 0;
+}
+
+int posix_spawn_file_actions_destroy(posix_spawn_file_actions_t *fa)
+{
+    return 0;
+}
+
+int posix_spawnp(pid_t *pid, const char *file,
+    const posix_spawn_file_actions_t *fa,
+    const posix_spawnattr_t *attrp,
+    char *const argv[], char *const envp[])
+{
+    pid_t p;
+
+    if (attrp != NULL)
+        return EINVAL;
+
+    p = fork();
+    if (p == -1)
+        return errno;
+
+    if (p == 0) {
+        for (int i = 0; i < fa->used; i++) {
+            int err = dup2(fa->action[i].filedes, fa->action[i].newfiledes);
+            if (err == -1)
+                goto fail;
+        }
+        execvpe(file, argv, envp);
+fail:
+        _exit(127);
+    }
+
+    *pid = p;
+    return 0;
+}

osdep/android/posix-spawn.h

@@ -0,0 +1,43 @@
+/*
+ * posix-spawn replacement for Android
+ *
+ * This file is part of mpv.
+ *
+ * mpv is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * mpv 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with mpv.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <sys/types.h>
+
+#define MAX_FILE_ACTIONS 4
+
+typedef struct {
+    char dummy;
+} posix_spawnattr_t; /* unsupported */
+
+typedef struct {
+    int used;
+    struct {
+        int filedes, newfiledes;
+    } action[MAX_FILE_ACTIONS];
+} posix_spawn_file_actions_t;
+
+int posix_spawn_file_actions_adddup2(posix_spawn_file_actions_t*, int, int);
+int posix_spawn_file_actions_init(posix_spawn_file_actions_t*);
+int posix_spawn_file_actions_destroy(posix_spawn_file_actions_t*);
+
+int posix_spawnp(pid_t*, const char*,
+    const posix_spawn_file_actions_t*, const posix_spawnattr_t *,
+    char *const [], char *const []);

osdep/posix-spawn.h

@@ -0,0 +1,27 @@
+/*
+ * posix-spawn wrapper
+ *
+ * This file is part of mpv.
+ *
+ * mpv is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * mpv 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with mpv.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#ifdef __ANDROID__
+// posix_spawn(p) does not exist at all on Android
+#include "osdep/android/posix-spawn.h"
+#else
+#include <spawn.h>
+#endif

osdep/subprocess-posix.c

@@ -15,7 +15,7 @@
  * License along with mpv.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#include <spawn.h>
+#include "osdep/posix-spawn.h"
 #include <poll.h>
 #include <unistd.h>
 #include <sys/types.h>