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microcom: tiny shrink, adding comments

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This commit is contained in:
Denis Vlasenko 2008-02-19 18:26:40 +00:00
parent 671ca33aa1
commit 624188aec0
1 changed files with 8 additions and 7 deletions
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15
miscutils/microcom.c
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@ -51,18 +51,17 @@ int microcom_main(int argc, char **argv)
enum {
OPT_X = 1 << 0, // do not respect Ctrl-X, Ctrl-@
OPT_s = 1 << 1, // baudrate
OPT_d = 1 << 2, // wait for device response, msecs
OPT_d = 1 << 2, // wait for device response, ms
OPT_t = 1 << 3, // timeout, ms
};
speed_t speed = 9600;
int delay = -1;
int timeout = -1;
unsigned opts;
// fetch options
unsigned opts;
opt_complementary = "=1:s+:d+:t+"; // exactly one arg should be there
opt_complementary = "=1:s+:d+:t+"; // exactly one arg, numeric options
opts = getopt32(argv, "Xs:d:t:", &speed, &delay, &timeout);
// argc -= optind;
argv += optind;
@ -71,14 +70,16 @@ int microcom_main(int argc, char **argv)
device_lock_file = xasprintf("/var/lock/LCK..%s", device_lock_file);
sfd = open(device_lock_file, O_CREAT | O_WRONLY | O_TRUNC | O_EXCL, 0644);
if (sfd < 0) {
// device already locked -> bail out
if (errno == EEXIST)
bb_perror_msg_and_die("can't create %s", device_lock_file);
// can't create lock -> don't care
if (ENABLE_FEATURE_CLEAN_UP)
free(device_lock_file);
device_lock_file = NULL;
}
if (sfd > 0) {
// %4d to make mgetty happy. It treats 4-bytes lock files as binary,
} else {
// %4d to make concurrent mgetty (if any) happy.
// Mgetty treats 4-bytes lock files as binary,
// not text, PID. Making 5+ char file. Brrr...
char *s = xasprintf("%4d\n", getpid());
write(sfd, s, strlen(s));