** Description changed:
- I used ftp (netkit-ftp-0.17) to get some files when prompt was on, the
- block happened.
+ I used ftp (netkit-ftp-0.17) to get some files when prompt was on, the block
happened.
+ BTW. The ftp server is 3CDeamon Version2.0 Revision10
----
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.
+ 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,
+ 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);
+ struct sockaddr_in from;
+ int s, tos;
+ socklen_t fromlen = sizeof(from);
- if (passivemode)
- return (fdopen(data, lmode));
+ 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;
+ 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)");
+ 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));
+ 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???
+ is it a bug? i don't kown how to deal with it.
+ can somebody give me a hand to solve it???
thank you.
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https://bugs.launchpad.net/bugs/1130512
Title:
accept strace block
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