Public bug reported:
I used ftp (netkit-ftp-0.17) to get some files when prompt was on, the
block happened.
----
local: test1.css remote: test1.css
200 PORT command successful.
150 File status OK ; about to open data connection
(#block happened. here is wating...)
----
i used strace command to find out the reason.
the block happened when socket accepted.
---
write(3, "RETR test1.css\r\n", 24) = 24
rt_sigaction(SIGINT, {0x805630f, [INT], SA_RESTART}, {0x805630f, [INT],
SA_RESTART}, 8) = 0
read(3, "150 File status OK ; about to op"..., 1024) = 52
write(1, "150 File status OK ; about to op"..., 51) = 51
rt_sigaction(SIGINT, {0x805630f, [INT], SA_RESTART}, {0x805630f, [INT],
SA_RESTART}, 8) = 0
rt_sigaction(SIGINT, {0x8057fdd, [INT], SA_RESTART}, {0x805630f, [INT],
SA_RESTART}, 8) = 0
accept(5,
(#wating...)
----
the source is below:
------
static FILE *
dataconn(const char *lmode)
{
struct sockaddr_in from;
int s, tos;
socklen_t fromlen = sizeof(from);
if (passivemode)
return (fdopen(data, lmode));
s = accept(data, (struct sockaddr *) &from, &fromlen); --> (here is
the problem which block happen.)
if (s < 0) {
perror("ftp: accept");
(void) close(data), data = -1;
return (NULL);
}
(void) close(data);
data = s;
#ifdef IP_TOS
tos = IPTOS_THROUGHPUT;
if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&tos, sizeof(int)) < 0)
perror("ftp: setsockopt TOS (ignored)");
#endif
return (fdopen(data, lmode));
}
------
i search the internet , and found accept will block the process.
is it a bug? i don't kown how to deal with it.
can somebody give me a hand to solve it???
thank you.
** Affects: netkit-ftp (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1130512
Title:
accept strace block
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