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-rw-r--r--sub-process.c102
1 files changed, 102 insertions, 0 deletions
diff --git a/sub-process.c b/sub-process.c
new file mode 100644
index 0000000..536b60c
--- /dev/null
+++ b/sub-process.c
@@ -0,0 +1,102 @@
+/*
+ * Generic implementation of background process infrastructure.
+ */
+#include "sub-process.h"
+#include "sigchain.h"
+#include "pkt-line.h"
+
+int cmd2process_cmp(const struct subprocess_entry *e1,
+ const struct subprocess_entry *e2,
+ const void *unused)
+{
+ return strcmp(e1->cmd, e2->cmd);
+}
+
+struct subprocess_entry *subprocess_find_entry(struct hashmap *hashmap, const char *cmd)
+{
+ struct subprocess_entry key;
+
+ hashmap_entry_init(&key, strhash(cmd));
+ key.cmd = cmd;
+ return hashmap_get(hashmap, &key, NULL);
+}
+
+void subprocess_read_status(int fd, struct strbuf *status)
+{
+ struct strbuf **pair;
+ char *line;
+ for (;;) {
+ line = packet_read_line(fd, NULL);
+ if (!line)
+ break;
+ pair = strbuf_split_str(line, '=', 2);
+ if (pair[0] && pair[0]->len && pair[1]) {
+ /* the last "status=<foo>" line wins */
+ if (!strcmp(pair[0]->buf, "status=")) {
+ strbuf_reset(status);
+ strbuf_addbuf(status, pair[1]);
+ }
+ }
+ strbuf_list_free(pair);
+ }
+}
+
+void subprocess_stop(struct hashmap *hashmap, struct subprocess_entry *entry)
+{
+ if (!entry)
+ return;
+
+ entry->process.clean_on_exit = 0;
+ kill(entry->process.pid, SIGTERM);
+ finish_command(&entry->process);
+
+ hashmap_remove(hashmap, entry, NULL);
+}
+
+static void subprocess_exit_handler(struct child_process *process)
+{
+ sigchain_push(SIGPIPE, SIG_IGN);
+ /* Closing the pipe signals the subprocess to initiate a shutdown. */
+ close(process->in);
+ close(process->out);
+ sigchain_pop(SIGPIPE);
+ /* Finish command will wait until the shutdown is complete. */
+ finish_command(process);
+}
+
+int subprocess_start(struct hashmap *hashmap, struct subprocess_entry *entry, const char *cmd,
+ subprocess_start_fn startfn)
+{
+ int err;
+ struct child_process *process;
+ const char *argv[] = { cmd, NULL };
+
+ entry->cmd = cmd;
+ process = &entry->process;
+
+ child_process_init(process);
+ process->argv = argv;
+ process->use_shell = 1;
+ process->in = -1;
+ process->out = -1;
+ process->clean_on_exit = 1;
+ process->clean_on_exit_handler = subprocess_exit_handler;
+
+ err = start_command(process);
+ if (err) {
+ error("cannot fork to run subprocess '%s'", cmd);
+ return err;
+ }
+
+ hashmap_entry_init(entry, strhash(cmd));
+
+ err = startfn(entry);
+ if (err) {
+ error("initialization for subprocess '%s' failed", cmd);
+ subprocess_stop(hashmap, entry);
+ return err;
+ }
+
+ hashmap_add(hashmap, entry);
+ return 0;
+}