2 * Generic implementation of background process infrastructure.
4 #include "sub-process.h"
8 int cmd2process_cmp(const void *unused_cmp_data,
10 const void *entry_or_key,
11 const void *unused_keydata)
13 const struct subprocess_entry *e1 = entry;
14 const struct subprocess_entry *e2 = entry_or_key;
16 return strcmp(e1->cmd, e2->cmd);
19 struct subprocess_entry *subprocess_find_entry(struct hashmap *hashmap, const char *cmd)
21 struct subprocess_entry key;
23 hashmap_entry_init(&key, strhash(cmd));
25 return hashmap_get(hashmap, &key, NULL);
28 int subprocess_read_status(int fd, struct strbuf *status)
35 len = packet_read_line_gently(fd, NULL, &line);
36 if ((len < 0) || !line)
38 pair = strbuf_split_str(line, '=', 2);
39 if (pair[0] && pair[0]->len && pair[1]) {
40 /* the last "status=<foo>" line wins */
41 if (!strcmp(pair[0]->buf, "status=")) {
43 strbuf_addbuf(status, pair[1]);
46 strbuf_list_free(pair);
49 return (len < 0) ? len : 0;
52 void subprocess_stop(struct hashmap *hashmap, struct subprocess_entry *entry)
57 entry->process.clean_on_exit = 0;
58 kill(entry->process.pid, SIGTERM);
59 finish_command(&entry->process);
61 hashmap_remove(hashmap, entry, NULL);
64 static void subprocess_exit_handler(struct child_process *process)
66 sigchain_push(SIGPIPE, SIG_IGN);
67 /* Closing the pipe signals the subprocess to initiate a shutdown. */
70 sigchain_pop(SIGPIPE);
71 /* Finish command will wait until the shutdown is complete. */
72 finish_command(process);
75 int subprocess_start(struct hashmap *hashmap, struct subprocess_entry *entry, const char *cmd,
76 subprocess_start_fn startfn)
79 struct child_process *process;
80 const char *argv[] = { cmd, NULL };
83 process = &entry->process;
85 child_process_init(process);
87 process->use_shell = 1;
90 process->clean_on_exit = 1;
91 process->clean_on_exit_handler = subprocess_exit_handler;
93 err = start_command(process);
95 error("cannot fork to run subprocess '%s'", cmd);
99 hashmap_entry_init(entry, strhash(cmd));
101 err = startfn(entry);
103 error("initialization for subprocess '%s' failed", cmd);
104 subprocess_stop(hashmap, entry);
108 hashmap_add(hashmap, entry);