sub-process: move sub-process functions into separate files
[git/git.git] / sub-process.c
1 /*
2 * Generic implementation of background process infrastructure.
3 */
4 #include "sub-process.h"
5 #include "sigchain.h"
6 #include "pkt-line.h"
7
8 int cmd2process_cmp(const struct subprocess_entry *e1,
9 const struct subprocess_entry *e2,
10 const void *unused)
11 {
12 return strcmp(e1->cmd, e2->cmd);
13 }
14
15 struct subprocess_entry *subprocess_find_entry(struct hashmap *hashmap, const char *cmd)
16 {
17 struct subprocess_entry key;
18
19 hashmap_entry_init(&key, strhash(cmd));
20 key.cmd = cmd;
21 return hashmap_get(hashmap, &key, NULL);
22 }
23
24 void subprocess_read_status(int fd, struct strbuf *status)
25 {
26 struct strbuf **pair;
27 char *line;
28 for (;;) {
29 line = packet_read_line(fd, NULL);
30 if (!line)
31 break;
32 pair = strbuf_split_str(line, '=', 2);
33 if (pair[0] && pair[0]->len && pair[1]) {
34 /* the last "status=<foo>" line wins */
35 if (!strcmp(pair[0]->buf, "status=")) {
36 strbuf_reset(status);
37 strbuf_addbuf(status, pair[1]);
38 }
39 }
40 strbuf_list_free(pair);
41 }
42 }
43
44 void subprocess_stop(struct hashmap *hashmap, struct subprocess_entry *entry)
45 {
46 if (!entry)
47 return;
48
49 entry->process.clean_on_exit = 0;
50 kill(entry->process.pid, SIGTERM);
51 finish_command(&entry->process);
52
53 hashmap_remove(hashmap, entry, NULL);
54 }
55
56 static void subprocess_exit_handler(struct child_process *process)
57 {
58 sigchain_push(SIGPIPE, SIG_IGN);
59 /* Closing the pipe signals the subprocess to initiate a shutdown. */
60 close(process->in);
61 close(process->out);
62 sigchain_pop(SIGPIPE);
63 /* Finish command will wait until the shutdown is complete. */
64 finish_command(process);
65 }
66
67 int subprocess_start(struct hashmap *hashmap, struct subprocess_entry *entry, const char *cmd,
68 subprocess_start_fn startfn)
69 {
70 int err;
71 struct child_process *process;
72 const char *argv[] = { cmd, NULL };
73
74 entry->cmd = cmd;
75 process = &entry->process;
76
77 child_process_init(process);
78 process->argv = argv;
79 process->use_shell = 1;
80 process->in = -1;
81 process->out = -1;
82 process->clean_on_exit = 1;
83 process->clean_on_exit_handler = subprocess_exit_handler;
84
85 err = start_command(process);
86 if (err) {
87 error("cannot fork to run subprocess '%s'", cmd);
88 return err;
89 }
90
91 hashmap_entry_init(entry, strhash(cmd));
92
93 err = startfn(entry);
94 if (err) {
95 error("initialization for subprocess '%s' failed", cmd);
96 subprocess_stop(hashmap, entry);
97 return err;
98 }
99
100 hashmap_add(hashmap, entry);
101 return 0;
102 }