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replaced the select() calls by poll()

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This commit is contained in:
Gerhard Rieger 2008-07-24 21:51:38 +02:00
parent 5251c21479
commit a1c0e96592
9 changed files with 118 additions and 70 deletions
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3
CHANGES
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@ -22,6 +22,9 @@ corrections:
improved test.sh script
replaced the select() calls by poll() to cleanly fix the problems with
many file descriptors already open
####################### V 1.6.0.1:
new features:

2
VERSION
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@ -1 +1 @@
"1.6.0.1+ip4bind+recvfromfork+x64+execstderr+execspaces+cosmetics"
"1.6.0.1+ip4bind+recvfromfork+x64+execstderr+execspaces+cosmetics+poll"

4
error.h
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@ -50,6 +50,8 @@
#define Error6(m,a1,a2,a3,a4,a5,a6) msg(E_ERROR,m,a1,a2,a3,a4,a5,a6)
#define Error7(m,a1,a2,a3,a4,a5,a6,a7) msg(E_ERROR,m,a1,a2,a3,a4,a5,a6,a7)
#define Error8(m,a1,a2,a3,a4,a5,a6,a7,a8) msg(E_ERROR,m,a1,a2,a3,a4,a5,a6,a7,a8)
#define Error9(m,a1,a2,a3,a4,a5,a6,a7,a8,a9) msg(E_ERROR,m,a1,a2,a3,a4,a5,a6,a7,a8,a9)
#define Error10(m,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10) msg(E_ERROR,m,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10)
#else /* !(WITH_MSGLEVEL >= E_ERROR) */
#define Error(m)
#define Error1(m,a1)
@ -60,6 +62,8 @@
#define Error6(m,a1,a2,a3,a4,a5,a6)
#define Error7(m,a1,a2,a3,a4,a5,a6,a7)
#define Error8(m,a1,a2,a3,a4,a5,a6,a7,a8)
#define Error9(m,a1,a2,a3,a4,a5,a6,a7,a8,a9)
#define Error10(m,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10)
#endif /* !(WITH_MSGLEVEL <= E_ERROR) */
#if WITH_MSGLEVEL <= E_WARN

110
socat.c
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@ -83,12 +83,16 @@ bool havelock;
int main(int argc, const char *argv[]) {
const char **arg1, *a;
char *mainwaitstring;
char buff[10];
double rto;
int i, argc0, result;
struct utsname ubuf;
int lockrc;
if (mainwaitstring = getenv("SOCAT_MAIN_WAIT")) {
sleep(atoi(mainwaitstring));
}
diag_set('p', strchr(argv[0], '/') ? strrchr(argv[0], '/')+1 : argv[0]);
/* we must init before applying options because env settings have lower
@ -642,37 +646,32 @@ int socat(const char *address1, const char *address2) {
returns >0 if child died and left data
*/
int childleftdata(xiofile_t *xfd) {
fd_set in, out, expt;
struct pollfd in;
int timeout = 0; /* milliseconds */
int retval;
/* have to check if a child process died before, but left read data */
if (XIO_READABLE(xfd) &&
(XIO_RDSTREAM(xfd)->howtoend == END_KILL ||
XIO_RDSTREAM(xfd)->howtoend == END_CLOSE_KILL ||
XIO_RDSTREAM(xfd)->howtoend == END_SHUTDOWN_KILL) &&
XIO_RDSTREAM(xfd)->para.exec.pid == 0) {
struct timeval time0 = { 0,0 };
FD_ZERO(&in); FD_ZERO(&out); FD_ZERO(&expt);
if (XIO_READABLE(xfd) && !(XIO_RDSTREAM(xfd)->eof >= 2 && !XIO_RDSTREAM(xfd)->ignoreeof)) {
FD_SET(XIO_GETRDFD(xfd), &in);
/*0 FD_SET(XIO_GETRDFD(xfd), &expt);*/
in.fd = XIO_GETRDFD(xfd);
in.events = POLLIN/*|POLLRDBAND*/;
in.revents = 0;
}
do {
retval = Select(FD_SETSIZE, &in, &out, &expt, &time0);
retval = xiopoll(&in, 1, timeout);
} while (retval < 0 && errno == EINTR);
if (retval < 0) {
#if HAVE_FDS_BITS
Error5("select(%d, &0x%lx, &0x%lx, &0x%lx, {0}): %s",
FD_SETSIZE, in.fds_bits[0], out.fds_bits[0],
expt.fds_bits[0], strerror(errno));
#else
Error5("select(%d, &0x%lx, &0x%lx, &0x%lx, {0}): %s",
FD_SETSIZE, in.__fds_bits[0], out.__fds_bits[0],
expt.__fds_bits[0], strerror(errno));
#endif
Error4("xiopoll({%d,%0o}, 1, %d): %s",
in.fd, in.events, timeout, strerror(errno));
return -1;
} else if (retval == 0) {
}
if (retval == 0) {
Info("terminated child did not leave data for us");
XIO_RDSTREAM(xfd)->eof = 2;
xfd->stream.eof = 2;
@ -694,7 +693,11 @@ bool maywr2; /* sock2 can be written to, according to select() */
and their options are set/applied
returns -1 on error or 0 on success */
int _socat(void) {
fd_set in, out, expt;
struct pollfd fds[4],
*fd1in = &fds[0],
*fd1out = &fds[1],
*fd2in = &fds[2],
*fd2out = &fds[3];
int retval;
unsigned char *buff;
ssize_t bytes1, bytes2;
@ -747,7 +750,7 @@ int _socat(void) {
XIO_GETRDFD(sock2), XIO_GETWRFD(sock2));
while (XIO_RDSTREAM(sock1)->eof <= 1 ||
XIO_RDSTREAM(sock2)->eof <= 1) {
struct timeval timeout, *to = NULL;
int timeout;
Debug6("data loop: sock1->eof=%d, sock2->eof=%d, closing=%d, wasaction=%d, total_to={"F_tv_sec"."F_tv_usec"}",
XIO_RDSTREAM(sock1)->eof, XIO_RDSTREAM(sock2)->eof,
@ -783,59 +786,77 @@ int _socat(void) {
if (polling) {
/* there is a ignoreeof poll timeout, use it */
timeout = socat_opts.pollintv;
to = &timeout;
timeout = 1000*socat_opts.pollintv.tv_sec +
socat_opts.pollintv.tv_usec/1000; /*!!! overflow?*/
} else if (socat_opts.total_timeout.tv_sec != 0 ||
socat_opts.total_timeout.tv_usec != 0) {
/* there might occur a total inactivity timeout */
timeout = socat_opts.total_timeout;
to = &timeout;
timeout = 1000*socat_opts.total_timeout.tv_sec +
socat_opts.total_timeout.tv_usec/1000;
} else {
to = NULL;
timeout = -1; /* forever */
}
if (closing>=1) {
/* first eof already occurred, start end timer */
timeout = socat_opts.closwait;
to = &timeout;
timeout = 1000*socat_opts.closwait.tv_sec +
socat_opts.closwait.tv_usec/1000;
closing = 2;
}
do {
int _errno;
FD_ZERO(&in); FD_ZERO(&out); FD_ZERO(&expt);
childleftdata(sock1);
childleftdata(sock2);
if (closing>=1) {
/* first eof already occurred, start end timer */
timeout = socat_opts.closwait;
to = &timeout;
timeout = 1000*socat_opts.closwait.tv_sec +
socat_opts.closwait.tv_usec/1000;
closing = 2;
}
/* now the fds are assigned */
if (XIO_READABLE(sock1) &&
!(XIO_RDSTREAM(sock1)->eof > 1 && !XIO_RDSTREAM(sock1)->ignoreeof) &&
!socat_opts.righttoleft) {
if (!mayrd1) {
FD_SET(XIO_GETRDFD(sock1), &in);
fd1in->fd = XIO_GETRDFD(sock1);
fd1in->events = POLLIN;
} else {
fd1in->fd = -1;
}
if (!maywr2) {
FD_SET(XIO_GETWRFD(sock2), &out);
fd2out->fd = XIO_GETWRFD(sock2);
fd2out->events = POLLOUT;
} else {
fd2out->fd = -1;
}
} else {
fd1in->fd = -1;
fd2out->fd = -1;
}
if (XIO_READABLE(sock2) &&
!(XIO_RDSTREAM(sock2)->eof > 1 && !XIO_RDSTREAM(sock2)->ignoreeof) &&
!socat_opts.lefttoright) {
if (!mayrd2) {
FD_SET(XIO_GETRDFD(sock2), &in);
fd2in->fd = XIO_GETRDFD(sock2);
fd2in->events = POLLIN;
} else {
fd2in->fd = -1;
}
if (!maywr1) {
FD_SET(XIO_GETWRFD(sock1), &out);
fd1out->fd = XIO_GETWRFD(sock1);
fd1out->events = POLLOUT;
} else {
fd1out->fd = -1;
}
} else {
fd1out->fd = -1;
fd2in->fd = -1;
}
retval = Select(FD_SETSIZE, &in, &out, &expt, to);
retval = xiopoll(fds, 4, timeout);
_errno = errno;
if (retval < 0 && errno == EINTR) {
Info1("select(): %s", strerror(errno));
@ -849,17 +870,10 @@ int _socat(void) {
*/
if (retval < 0) {
#if HAVE_FDS_BITS
Error7("select(%d, &0x%lx, &0x%lx, &0x%lx, %s%lu): %s",
FD_SETSIZE, in.fds_bits[0], out.fds_bits[0],
expt.fds_bits[0], to?"&":"NULL/", to?to->tv_sec:0,
strerror(errno));
#else
Error7("select(%d, &0x%lx, &0x%lx, &0x%lx, %s%lu): %s",
FD_SETSIZE, in.__fds_bits[0], out.__fds_bits[0],
expt.__fds_bits[0], to?"&":"NULL/", to?to->tv_sec:0,
strerror(errno));
#endif
Error10("xiopoll({%d,%0o}{%d,%0o}{%d,%0o}{%d,%0o}, 4, %d): %s",
fds[0].fd, fds[0].events, fds[1].fd, fds[1].events,
fds[2].fd, fds[2].events, fds[3].fd, fds[3].events,
timeout, strerror(errno));
return -1;
} else if (retval == 0) {
Info2("select timed out (no data within %ld.%06ld seconds)",
@ -884,17 +898,17 @@ int _socat(void) {
}
if (XIO_READABLE(sock1) && XIO_GETRDFD(sock1) >= 0 &&
FD_ISSET(XIO_GETRDFD(sock1), &in)) {
(fd1in->revents&(POLLIN|POLLHUP|POLLERR))) {
mayrd1 = true;
}
if (XIO_READABLE(sock2) && XIO_GETRDFD(sock2) >= 0 &&
FD_ISSET(XIO_GETRDFD(sock2), &in)) {
(fd2in->revents&(POLLIN|POLLHUP|POLLERR))) {
mayrd2 = true;
}
if (XIO_GETWRFD(sock1) >= 0 && FD_ISSET(XIO_GETWRFD(sock1), &out)) {
if (XIO_GETWRFD(sock1) >= 0 && (fd1out->revents&(POLLOUT|POLLERR))) {
maywr1 = true;
}
if (XIO_GETWRFD(sock2) >= 0 && FD_ISSET(XIO_GETWRFD(sock2), &out)) {
if (XIO_GETWRFD(sock2) >= 0 && (fd2out->revents&(POLLOUT|POLLERR))) {
maywr2 = true;
}

16
sycls.c
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@ -677,9 +677,21 @@ int Chmod(const char *path, mode_t mode) {
/* we only show the first struct pollfd; hope this is enough for most cases. */
int Poll(struct pollfd *ufds, unsigned int nfds, int timeout) {
int result;
Debug4("poll({%d, 0x%02hx, }, %u, %d)", ufds[0].fd, ufds[0].events, nfds, timeout);
if (nfds == 4) {
Debug10("poll({%d,0x%02hx,}{%d,0x%02hx,}{%d,0x%02hx,}{%d,0x%02hx,}, , %u, %d)",
ufds[0].fd, ufds[0].events, ufds[1].fd, ufds[1].events,
ufds[2].fd, ufds[2].events, ufds[3].fd, ufds[3].events,
nfds, timeout);
} else {
Debug4("poll({%d,0x%02hx,}, , %u, %d)", ufds[0].fd, ufds[0].events, nfds, timeout);
}
result = poll(ufds, nfds, timeout);
Debug2("poll(, {,, 0x%02hx}) -> %d", ufds[0].revents, result);
if (nfds == 4) {
Debug5("poll(, {,,0x%02hx}{,,0x%02hx}{,,0x%02hx}{,,0x%02hx}) -> %d",
ufds[0].revents, ufds[1].revents, ufds[2].revents, ufds[3].revents, result);
} else {
Debug2("poll(, {,,0x%02hx}) -> %d", ufds[0].revents, result);
}
return result;
}
#endif /* HAVE_POLL */

13
sysutils.c
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@ -1,5 +1,5 @@
/* source: sysutils.c */
/* Copyright Gerhard Rieger 2001-2007 */
/* Copyright Gerhard Rieger 2001-2008 */
/* Published under the GNU General Public License V.2, see file COPYING */
/* translate socket addresses into human readable form */
@ -400,6 +400,17 @@ const char *hstrerror(int err) {
return h_messages[err];
}
#endif /* !HAVE_HSTRERROR */
/* this function behaves like poll(). It tries to do so even when the poll()
system call is not available. */
int xiopoll(struct pollfd fds[], nfds_t nfds, int timeout) {
#if HAVE_POLL
return Poll(fds, nfds, timeout);
#else /* HAVE_POLL */
/*!!! wrap around Select() */
#endif /* !HAVE_POLL */
}
#if WITH_TCP || WITH_UDP

2
sysutils.h
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@ -90,6 +90,8 @@ extern int getusergroups(const char *user, gid_t *list, size_t *ngroups);
extern const char *hstrerror(int err);
#endif
extern int xiopoll(struct pollfd fds[], nfds_t nfds, int timeout);
extern int parseport(const char *portname, int proto);
extern int ifindexbyname(const char *ifname);

30
xio-socket.c
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@ -269,19 +269,21 @@ int _xioopen_connect(struct single *xfd, struct sockaddr *us, size_t uslen,
if (errno == EINPROGRESS) {
if (xfd->para.socket.connect_timeout.tv_sec != 0 ||
xfd->para.socket.connect_timeout.tv_usec != 0) {
struct timeval timeout;
fd_set readfds, writefds, exceptfds;
int timeout;
struct pollfd writefd;
int result;
Info4("connect(%d, %s, "F_Zd"): %s",
xfd->fd, sockaddr_info(them, themlen, infobuff, sizeof(infobuff)),
themlen, strerror(errno));
timeout = xfd->para.socket.connect_timeout;
FD_ZERO(&readfds); FD_ZERO(&writefds); FD_ZERO(&exceptfds);
FD_SET(xfd->fd, &readfds); FD_SET(xfd->fd, &writefds);
result =
Select(xfd->fd+1, &readfds, &writefds, &exceptfds, &timeout);
timeout = 1000*xfd->para.socket.connect_timeout.tv_sec +
xfd->para.socket.connect_timeout.tv_usec/1000;
writefd.fd = xfd->fd;
writefd.events = (POLLIN|POLLHUP|POLLERR);
result = Poll(&writefd, 1, timeout);
if (result < 0) {
Msg2(level, "select(%d,,,,): %s", xfd->fd+1, strerror(errno));
Msg3(level, "poll({%d,POLLIN|POLLHUP|POLLER},,%d): %s",
xfd->fd, timeout, strerror(errno));
return STAT_RETRYLATER;
}
if (result == 0) {
@ -290,7 +292,7 @@ int _xioopen_connect(struct single *xfd, struct sockaddr *us, size_t uslen,
strerror(ETIMEDOUT));
return STAT_RETRYLATER;
}
if (FD_ISSET(xfd->fd, &readfds)) {
if (writefd.revents & POLLOUT) {
#if 0
unsigned char dummy[1];
Read(xfd->fd, &dummy, 1); /* get error message */
@ -726,16 +728,16 @@ int _xioopen_dgram_recvfrom(struct single *xfd, int xioflags,
/* loop until select() returns valid */
do {
fd_set in, out, expt;
struct pollfd readfd;
/*? int level = E_ERROR;*/
if (us != NULL) {
Notice1("receiving on %s", sockaddr_info(us, uslen, lisname, sizeof(lisname)));
} else {
Notice1("receiving IP protocol %u", proto);
}
FD_ZERO(&in); FD_ZERO(&out); FD_ZERO(&expt);
FD_SET(xfd->fd, &in);
if (Select(xfd->fd+1, &in, &out, &expt, NULL) > 0) {
readfd.fd = xfd->fd;
readfd.events = POLLIN;
if (Poll(&readfd, 1, -1) > 0) {
break;
}
@ -743,7 +745,7 @@ int _xioopen_dgram_recvfrom(struct single *xfd, int xioflags,
continue;
}
Msg2(level, "select(, {%d}): %s", xfd->fd, strerror(errno));
Msg2(level, "poll({%d,,},,-1): %s", xfd->fd, strerror(errno));
Close(xfd->fd);
return STAT_RETRYLATER;
} while (true);

8
xio-udp.c
View File

@ -84,7 +84,7 @@ int xioopen_ipdgram_listen(int argc, const char *argv[], struct opt *opts,
union sockaddr_union themunion;
union sockaddr_union *them = &themunion;
int socktype = SOCK_DGRAM;
fd_set in, out, expt;
struct pollfd readfd;
bool dofork = false;
pid_t pid;
char *rangename;
@ -205,9 +205,9 @@ int xioopen_ipdgram_listen(int argc, const char *argv[], struct opt *opts,
Notice1("listening on UDP %s",
sockaddr_info(&us.soa, uslen, infobuff, sizeof(infobuff)));
FD_ZERO(&in); FD_ZERO(&out); FD_ZERO(&expt);
FD_SET(fd->stream.fd, &in);
while (Select(fd->stream.fd+1, &in, &out, &expt, NULL) < 0) {
readfd.fd = fd->stream.fd;
readfd.events = POLLIN|POLLERR;
while (Poll(&readfd, 1, -1) < 0) {
if (errno != EINTR) break;
}