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Commit | Line | Data |
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99605d62 BP |
1 | /* |
2 | * Generic implementation of background process infrastructure. | |
3 | */ | |
4 | #include "sub-process.h" | |
5 | #include "sigchain.h" | |
6 | #include "pkt-line.h" | |
7 | ||
7663cdc8 SB |
8 | int cmd2process_cmp(const void *unused_cmp_data, |
9 | const struct subprocess_entry *e1, | |
10 | const struct subprocess_entry *e2, | |
11 | const void *unused_keydata) | |
99605d62 BP |
12 | { |
13 | return strcmp(e1->cmd, e2->cmd); | |
14 | } | |
15 | ||
16 | struct subprocess_entry *subprocess_find_entry(struct hashmap *hashmap, const char *cmd) | |
17 | { | |
18 | struct subprocess_entry key; | |
19 | ||
20 | hashmap_entry_init(&key, strhash(cmd)); | |
21 | key.cmd = cmd; | |
22 | return hashmap_get(hashmap, &key, NULL); | |
23 | } | |
24 | ||
4f2a2e9f | 25 | int subprocess_read_status(int fd, struct strbuf *status) |
99605d62 BP |
26 | { |
27 | struct strbuf **pair; | |
28 | char *line; | |
4f2a2e9f BP |
29 | int len; |
30 | ||
99605d62 | 31 | for (;;) { |
4f2a2e9f BP |
32 | len = packet_read_line_gently(fd, NULL, &line); |
33 | if ((len < 0) || !line) | |
99605d62 BP |
34 | break; |
35 | pair = strbuf_split_str(line, '=', 2); | |
36 | if (pair[0] && pair[0]->len && pair[1]) { | |
37 | /* the last "status=<foo>" line wins */ | |
38 | if (!strcmp(pair[0]->buf, "status=")) { | |
39 | strbuf_reset(status); | |
40 | strbuf_addbuf(status, pair[1]); | |
41 | } | |
42 | } | |
43 | strbuf_list_free(pair); | |
44 | } | |
4f2a2e9f BP |
45 | |
46 | return (len < 0) ? len : 0; | |
99605d62 BP |
47 | } |
48 | ||
49 | void subprocess_stop(struct hashmap *hashmap, struct subprocess_entry *entry) | |
50 | { | |
51 | if (!entry) | |
52 | return; | |
53 | ||
54 | entry->process.clean_on_exit = 0; | |
55 | kill(entry->process.pid, SIGTERM); | |
56 | finish_command(&entry->process); | |
57 | ||
58 | hashmap_remove(hashmap, entry, NULL); | |
59 | } | |
60 | ||
61 | static void subprocess_exit_handler(struct child_process *process) | |
62 | { | |
63 | sigchain_push(SIGPIPE, SIG_IGN); | |
64 | /* Closing the pipe signals the subprocess to initiate a shutdown. */ | |
65 | close(process->in); | |
66 | close(process->out); | |
67 | sigchain_pop(SIGPIPE); | |
68 | /* Finish command will wait until the shutdown is complete. */ | |
69 | finish_command(process); | |
70 | } | |
71 | ||
72 | int subprocess_start(struct hashmap *hashmap, struct subprocess_entry *entry, const char *cmd, | |
73 | subprocess_start_fn startfn) | |
74 | { | |
75 | int err; | |
76 | struct child_process *process; | |
77 | const char *argv[] = { cmd, NULL }; | |
78 | ||
79 | entry->cmd = cmd; | |
80 | process = &entry->process; | |
81 | ||
82 | child_process_init(process); | |
83 | process->argv = argv; | |
84 | process->use_shell = 1; | |
85 | process->in = -1; | |
86 | process->out = -1; | |
87 | process->clean_on_exit = 1; | |
88 | process->clean_on_exit_handler = subprocess_exit_handler; | |
89 | ||
90 | err = start_command(process); | |
91 | if (err) { | |
92 | error("cannot fork to run subprocess '%s'", cmd); | |
93 | return err; | |
94 | } | |
95 | ||
96 | hashmap_entry_init(entry, strhash(cmd)); | |
97 | ||
98 | err = startfn(entry); | |
99 | if (err) { | |
100 | error("initialization for subprocess '%s' failed", cmd); | |
101 | subprocess_stop(hashmap, entry); | |
102 | return err; | |
103 | } | |
104 | ||
105 | hashmap_add(hashmap, entry); | |
106 | return 0; | |
107 | } |