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4f2a2e9f0e
Enable sub-processes to gracefully handle when the process dies by updating subprocess_read_status to return an error on EOF instead of dying. Update apply_multi_file_filter to take advantage of the revised subprocess_read_status. Signed-off-by: Ben Peart <benpeart@microsoft.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
106 lines
2.4 KiB
C
106 lines
2.4 KiB
C
/*
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* Generic implementation of background process infrastructure.
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*/
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#include "sub-process.h"
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#include "sigchain.h"
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#include "pkt-line.h"
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int cmd2process_cmp(const struct subprocess_entry *e1,
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const struct subprocess_entry *e2,
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const void *unused)
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{
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return strcmp(e1->cmd, e2->cmd);
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}
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struct subprocess_entry *subprocess_find_entry(struct hashmap *hashmap, const char *cmd)
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{
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struct subprocess_entry key;
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hashmap_entry_init(&key, strhash(cmd));
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key.cmd = cmd;
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return hashmap_get(hashmap, &key, NULL);
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}
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int subprocess_read_status(int fd, struct strbuf *status)
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{
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struct strbuf **pair;
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char *line;
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int len;
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for (;;) {
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len = packet_read_line_gently(fd, NULL, &line);
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if ((len < 0) || !line)
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break;
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pair = strbuf_split_str(line, '=', 2);
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if (pair[0] && pair[0]->len && pair[1]) {
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/* the last "status=<foo>" line wins */
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if (!strcmp(pair[0]->buf, "status=")) {
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strbuf_reset(status);
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strbuf_addbuf(status, pair[1]);
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}
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}
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strbuf_list_free(pair);
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}
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return (len < 0) ? len : 0;
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}
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void subprocess_stop(struct hashmap *hashmap, struct subprocess_entry *entry)
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{
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if (!entry)
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return;
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entry->process.clean_on_exit = 0;
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kill(entry->process.pid, SIGTERM);
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finish_command(&entry->process);
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hashmap_remove(hashmap, entry, NULL);
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}
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static void subprocess_exit_handler(struct child_process *process)
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{
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sigchain_push(SIGPIPE, SIG_IGN);
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/* Closing the pipe signals the subprocess to initiate a shutdown. */
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close(process->in);
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close(process->out);
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sigchain_pop(SIGPIPE);
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/* Finish command will wait until the shutdown is complete. */
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finish_command(process);
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}
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int subprocess_start(struct hashmap *hashmap, struct subprocess_entry *entry, const char *cmd,
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subprocess_start_fn startfn)
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{
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int err;
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struct child_process *process;
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const char *argv[] = { cmd, NULL };
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entry->cmd = cmd;
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process = &entry->process;
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child_process_init(process);
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process->argv = argv;
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process->use_shell = 1;
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process->in = -1;
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process->out = -1;
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process->clean_on_exit = 1;
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process->clean_on_exit_handler = subprocess_exit_handler;
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err = start_command(process);
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if (err) {
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error("cannot fork to run subprocess '%s'", cmd);
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return err;
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}
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hashmap_entry_init(entry, strhash(cmd));
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err = startfn(entry);
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if (err) {
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error("initialization for subprocess '%s' failed", cmd);
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subprocess_stop(hashmap, entry);
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return err;
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}
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hashmap_add(hashmap, entry);
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return 0;
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}
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