1 files changed, 88 insertions, 0 deletions
diff --git a/osdep/subprocess.h b/osdep/subprocess.h
new file mode 100644
index 0000000..4bf2dc3
--- /dev/null
+++ b/osdep/subprocess.h
@@ -0,0 +1,88 @@
+/*
+ * 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/>.
+ */
+
+#ifndef MP_SUBPROCESS_H_
+#define MP_SUBPROCESS_H_
+
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdint.h>
+
+#include "misc/bstr.h"
+
+struct mp_cancel;
+
+// Incrementally called with data that was read. Buffer valid only during call.
+// size==0 means EOF.
+typedef void (*subprocess_read_cb)(void *ctx, char *data, size_t size);
+// Incrementally called to refill *mp_subprocess_fd.write_buf, whenever write_buf
+// has length 0 and the pipe is writable. While writing, *write_buf is adjusted
+// to contain only the not yet written data.
+// Not filling the buffer means EOF.
+typedef void (*subprocess_write_cb)(void *ctx);
+
+void mp_devnull(void *ctx, char *data, size_t size);
+
+#define MP_SUBPROCESS_MAX_FDS 10
+
+struct mp_subprocess_fd {
+    int fd;                         // target FD
+
+    // Only one of on_read or src_fd can be set. If none are set, use /dev/null.
+    // Note: "neutral" initialization requires setting src_fd=-1.
+    subprocess_read_cb on_read;     // if not NULL, serve reads
+    void *on_read_ctx;              // for on_read(on_read_ctx, ...)
+    subprocess_write_cb on_write;   // if not NULL, serve writes
+    void *on_write_ctx;             // for on_write(on_write_ctx, ...)
+    bstr *write_buf;                // must be !=NULL if on_write is set
+    int src_fd;                     // if >=0, dup this FD to target FD
+};
+
+struct mp_subprocess_opts {
+    char *exe;      // binary to execute (never non-NULL)
+    char **args;    // argument list (NULL for none, otherwise NULL-terminated)
+    char **env;     // if !NULL, set this as environment variable block
+    // Complete set of FDs passed down. All others are supposed to be closed.
+    struct mp_subprocess_fd fds[MP_SUBPROCESS_MAX_FDS];
+    int num_fds;
+    struct mp_cancel *cancel; // if !NULL, asynchronous process abort (kills it)
+    bool detach;    // if true, do not wait for process to end
+};
+
+struct mp_subprocess_result {
+    int error;              // one of MP_SUBPROCESS_* (>0 on error)
+    // NB: if WIFEXITED applies, error==0, and this is WEXITSTATUS
+    //     on win32, this can use the full 32 bit
+    //     if started with detach==true, this is always 0
+    uint32_t exit_status;   // if error==0==MP_SUBPROCESS_OK, 0 otherwise
+};
+
+// Subprocess error values.
+#define MP_SUBPROCESS_OK                0   // no error
+#define MP_SUBPROCESS_EGENERIC          -1  // unknown error
+#define MP_SUBPROCESS_EKILLED_BY_US     -2  // mp_cancel was triggered
+#define MP_SUBPROCESS_EINIT             -3  // error during initialization
+#define MP_SUBPROCESS_EUNSUPPORTED      -4  // API not supported
+
+// Turn MP_SUBPROCESS_* values into a static string. Never returns NULL.
+const char *mp_subprocess_err_str(int num);
+
+// Caller must set *opts.
+void mp_subprocess2(struct mp_subprocess_opts *opts,
+                    struct mp_subprocess_result *res);
+
+#endif