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tap-vsockd: add a --pidfile <pidfile> argument

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Signed-off-by: David Scott <dave.scott@docker.com>
This commit is contained in:
David Scott 2016-05-14 19:36:35 +01:00
parent a4a8d02560
commit f74d52574e
1 changed files with 42 additions and 4 deletions
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46
alpine/packages/tap-vsockd/tap-vsockd.c
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@ -304,11 +304,41 @@ static void server(GUID serviceid, const char *tap)
}
}
void write_pidfile(const char *pidfile) {
pid_t pid = getpid();
char * pid_s;
FILE *file;
int len;
if (asprintf(&pid_s, "%lld", (long long) pid) == -1) {
syslog(LOG_CRIT, "Failed to allocate pidfile string");
exit(1);
}
len = strlen(pid_s);
file = fopen(pidfile, "w");
if (file == NULL) {
syslog(LOG_CRIT, "Failed to open pidfile %s", pidfile);
exit(1);
}
if (fwrite(pid_s, 1, len, file) != len) {
syslog(LOG_CRIT, "Failed to write pid to pidfile");
exit(1);
}
fclose(file);
free(pid_s);
}
void usage(char *name)
{
printf("%s: --debug | --service id <id> | --tap <tap>\n", name);
printf("<id>: Hyper-V socket serviceId to bind\n");
printf("<tap>: tap device to connect to\n");
printf("%s: [--debug] [--tap <name>] [--serviceid <guid>] [--pid <file>]\n", name);
printf("\t[--listen | --connect]\n\n");
printf("--debug: log to stderr as well as syslog\n");
printf("--tap <name>: create a tap device with the given name (defaults to eth1)\n");
printf("--serviceid <guid>: use <guid> as the well-known service GUID\n");
printf("--pid <file>: write a pid to the given file\n");
printf("--listen: listen forever for incoming AF_HVSOCK connections\n");
printf("--connect: connect to the parent partition\n");
}
int __cdecl main(int argc, char **argv)
@ -319,6 +349,7 @@ int __cdecl main(int argc, char **argv)
/* Defaults to a testing GUID */
char *serviceid = "3049197C-9A4E-4FBF-9367-97F792F16994";
char *tap = "eth1";
char *pidfile = NULL;
opterr = 0;
while (1) {
@ -327,12 +358,13 @@ int __cdecl main(int argc, char **argv)
{"debug", no_argument, &debug_flag, 1},
{"serviceid", required_argument, NULL, 's'},
{"tap", required_argument, NULL, 't'},
{"pidfile", required_argument, NULL, 'p'},
{0, 0, 0, 0}
};
int option_index = 0;
c = getopt_long (argc, argv, "ds:t:", long_options, &option_index);
c = getopt_long (argc, argv, "ds:t:p:", long_options, &option_index);
if (c == -1) break;
switch (c) {
@ -345,6 +377,9 @@ int __cdecl main(int argc, char **argv)
case 't':
tap = optarg;
break;
case 'p':
pidfile = optarg;
break;
case 0:
break;
default:
@ -365,6 +400,9 @@ int __cdecl main(int argc, char **argv)
usage(argv[0]);
exit(1);
}
if (pidfile) {
write_pidfile(pidfile);
}
server(sid, tap);