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nc: remove some dead code

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function                                             old     new   delta
readwrite                                            887     841     -46

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2013-07-28 22:24:51 +02:00
parent ffeeb7a96c
commit fd3ac96c0f
1 changed files with 12 additions and 24 deletions
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36
networking/nc_bloaty.c
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@ -592,8 +592,6 @@ static int readwrite(void)
unsigned rzleft; unsigned rzleft;
unsigned rnleft; unsigned rnleft;
unsigned netretry; /* net-read retry counter */ unsigned netretry; /* net-read retry counter */
unsigned wretry; /* net-write sanity counter */
unsigned wfirst; /* one-shot flag to skip first net read */
unsigned fds_open; unsigned fds_open;
/* if you don't have all this FD_* macro hair in sys/types.h, you'll have to /* if you don't have all this FD_* macro hair in sys/types.h, you'll have to
@ -606,20 +604,16 @@ static int readwrite(void)
fds_open = 2; fds_open = 2;
netretry = 2; netretry = 2;
wfirst = 0;
rzleft = rnleft = 0; rzleft = rnleft = 0;
if (o_interval) if (o_interval)
sleep(o_interval); /* pause *before* sending stuff, too */ sleep(o_interval); /* pause *before* sending stuff, too */
errno = 0; /* clear from sleep, close, whatever */
/* and now the big ol' select shoveling loop ... */ /* and now the big ol' select shoveling loop ... */
/* nc 1.10 has "while (FD_ISSET(netfd)" here */ /* nc 1.10 has "while (FD_ISSET(netfd)" here */
while (fds_open) { while (fds_open) {
wretry = 8200; /* more than we'll ever hafta write */ unsigned wretry = 8200; /* net-write sanity counter */
if (wfirst) { /* any saved stdin buffer? */
wfirst = 0; /* clear flag for the duration */ errno = 0; /* clear from sleep, close, whatever */
goto shovel; /* and go handle it first */
}
ding2 = ding1; /* FD_COPY ain't portable... */ ding2 = ding1; /* FD_COPY ain't portable... */
/* some systems, notably linux, crap into their select timers on return, so /* some systems, notably linux, crap into their select timers on return, so
we create a expendable copy and give *that* to select. */ we create a expendable copy and give *that* to select. */
@ -644,7 +638,7 @@ static int readwrite(void)
if (!netretry) { if (!netretry) {
if (o_verbose > 1) /* normally we don't care */ if (o_verbose > 1) /* normally we don't care */
fprintf(stderr, "net timeout\n"); fprintf(stderr, "net timeout\n");
close(netfd); /*close(netfd); - redundant, exit will do it */
return 0; /* not an error! */ return 0; /* not an error! */
} }
} }
@ -681,8 +675,8 @@ Debug("got %d from the net, errno %d", rr, errno);
/* Considered making reads here smaller for UDP mode, but 8192-byte /* Considered making reads here smaller for UDP mode, but 8192-byte
mobygrams are kinda fun and exercise the reassembler. */ mobygrams are kinda fun and exercise the reassembler. */
if (rr <= 0) { /* at end, or fukt, or ... */ if (rr <= 0) { /* at end, or fukt, or ... */
FD_CLR(STDIN_FILENO, &ding1); /* disable and close stdin */ FD_CLR(STDIN_FILENO, &ding1); /* disable stdin */
close(STDIN_FILENO); /*close(STDIN_FILENO); - not really necessary */
/* Let peer know we have no more data */ /* Let peer know we have no more data */
/* nc 1.10 doesn't do this: */ /* nc 1.10 doesn't do this: */
shutdown(netfd, SHUT_WR); shutdown(netfd, SHUT_WR);
@ -697,23 +691,13 @@ Debug("got %d from the net, errno %d", rr, errno);
Geez, why does this look an awful lot like the big loop in "rsh"? ... Geez, why does this look an awful lot like the big loop in "rsh"? ...
not sure if the order of this matters, but write net -> stdout first. */ not sure if the order of this matters, but write net -> stdout first. */
/* sanity check. Works because they're both unsigned... */
if ((rzleft > 8200) || (rnleft > 8200)) {
holler_error("bogus buffers: %u, %u", rzleft, rnleft);
rzleft = rnleft = 0;
}
/* net write retries sometimes happen on UDP connections */
if (!wretry) { /* is something hung? */
holler_error("too many output retries");
return 1;
}
if (rnleft) { if (rnleft) {
rr = write(STDOUT_FILENO, np, rnleft); rr = write(STDOUT_FILENO, np, rnleft);
if (rr > 0) { if (rr > 0) {
if (o_ofile) /* log the stdout */ if (o_ofile) /* log the stdout */
oprint('<', (unsigned char *)np, rr); oprint('<', (unsigned char *)np, rr);
np += rr; /* fix up ptrs and whatnot */ np += rr; /* fix up ptrs and whatnot */
rnleft -= rr; /* will get sanity-checked above */ rnleft -= rr;
wrote_out += rr; /* global count */ wrote_out += rr; /* global count */
} }
Debug("wrote %d to stdout, errno %d", rr, errno); Debug("wrote %d to stdout, errno %d", rr, errno);
@ -735,11 +719,15 @@ Debug("wrote %d to net, errno %d", rr, errno);
} /* rzleft */ } /* rzleft */
if (o_interval) { /* cycle between slow lines, or ... */ if (o_interval) { /* cycle between slow lines, or ... */
sleep(o_interval); sleep(o_interval);
errno = 0; /* clear from sleep */
continue; /* ...with hairy select loop... */ continue; /* ...with hairy select loop... */
} }
if (rzleft || rnleft) { /* shovel that shit till they ain't */ if (rzleft || rnleft) { /* shovel that shit till they ain't */
wretry--; /* none left, and get another load */ wretry--; /* none left, and get another load */
/* net write retries sometimes happen on UDP connections */
if (!wretry) { /* is something hung? */
holler_error("too many output retries");
return 1;
}
goto shovel; goto shovel;
} }
} /* while ding1:netfd is open */ } /* while ding1:netfd is open */