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haproxy/dev/poll/poll.c

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C
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#define _GNU_SOURCE // for POLLRDHUP
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/types.h>
#ifdef __linux__
#include <sys/epoll.h>
#endif
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <errno.h>
#include <fcntl.h>
#include <poll.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
/* for OSes which don't have it */
#ifndef POLLRDHUP
#define POLLRDHUP 0
#endif
#ifndef MSG_NOSIGNAL
#define MSG_NOSIGNAL 0
#endif
#ifndef MSG_MORE
#define MSG_MORE 0
#endif
int verbose = 0;
int cmd = 0;
int cmdstep = 0;
int zero = 0;
int one = 1;
int lfd = -1;
int cfd = -1;
int sfd = -1;
int connected = 0;
int use_epoll = 0;
struct sockaddr_in saddr, caddr;
socklen_t salen, calen;
static inline const char *side(int fd)
{
if (fd == lfd)
return "l";
if (fd == sfd)
return "s";
if (fd == cfd)
return "c";
return "?";
}
void usage(const char *arg0)
{
printf("Usage: %s [ arg [<action>[,...]] ] ...\n"
"args:\n"
" -h display this help\n"
" -v verbose mode (shows ret values)\n"
" -e use epoll instead of poll\n"
" -c <actions> perform <action> on client side socket\n"
" -s <actions> perform <action> on server side socket\n"
" -l <actions> perform <action> on listening socket\n"
"\n"
"actions for -c/-s/-l (multiple may be delimited by commas) :\n"
" con connect to listener, implicit before first -c/-s\n"
" acc accept on listener, implicit before first -s\n"
" snd send a few bytes of data\n"
" mor send a few bytes of data with MSG_MORE\n"
" rcv receive a few bytes of data\n"
" drn drain: receive till zero\n"
" shr SHUT_RD : shutdown read side\n"
" shw SHUT_WR : shutdown write side\n"
" shb SHUT_RDWR : shutdown both sides\n"
" lin disable lingering on the socket\n"
" clo close the file descriptor\n"
" pol poll() for any event\n"
"\n", arg0);
}
void die(const char *msg)
{
if (msg)
fprintf(stderr, "%s\n", msg);
exit(1);
}
const char *get_errno(int ret)
{
static char errmsg[100];
if (ret >= 0)
return "";
snprintf(errmsg, sizeof(errmsg), " (%s)", strerror(errno));
return errmsg;
}
void do_acc(int fd)
{
int ret;
calen = sizeof(caddr);
ret = accept(lfd, (struct sockaddr*)&caddr, &calen);
if (sfd < 0)
sfd = ret;
if (verbose)
printf("cmd #%d stp #%d: %s(%s=%d): ret=%d%s\n", cmd, cmdstep, __FUNCTION__ + 3, side(fd), fd, ret, get_errno(ret));
}
void do_con(int fd)
{
int ret;
ret = connect(cfd, (const struct sockaddr*)&saddr, salen);
if (verbose)
printf("cmd #%d stp #%d: %s(%s=%d): ret=%d%s\n", cmd, cmdstep, __FUNCTION__ + 3, side(fd), fd, ret, get_errno(ret));
connected = 1;
}
void do_snd(int fd)
{
int ret;
ret = send(fd, "foo", 3, MSG_NOSIGNAL|MSG_DONTWAIT);
if (verbose)
printf("cmd #%d stp #%d: %s(%s=%d): ret=%d%s\n", cmd, cmdstep, __FUNCTION__ + 3, side(fd), fd, ret, get_errno(ret));
}
void do_mor(int fd)
{
int ret;
ret = send(fd, "foo", 3, MSG_NOSIGNAL|MSG_DONTWAIT|MSG_MORE);
if (verbose)
printf("cmd #%d stp #%d: %s(%s=%d): ret=%d%s\n", cmd, cmdstep, __FUNCTION__ + 3, side(fd), fd, ret, get_errno(ret));
}
void do_rcv(int fd)
{
char buf[10];
int ret;
ret = recv(fd, buf, sizeof(buf), MSG_DONTWAIT);
if (verbose)
printf("cmd #%d stp #%d: %s(%s=%d): ret=%d%s\n", cmd, cmdstep, __FUNCTION__ + 3, side(fd), fd, ret, get_errno(ret));
}
void do_drn(int fd)
{
char buf[16384];
int total = -1;
int ret;
while (1) {
ret = recv(fd, buf, sizeof(buf), 0);
if (ret <= 0)
break;
if (total < 0)
total = 0;
total += ret;
}
if (verbose)
printf("cmd #%d stp #%d: %s(%s=%d): ret=%d%s\n", cmd, cmdstep, __FUNCTION__ + 3, side(fd), fd, total, get_errno(ret));
}
void do_shr(int fd)
{
int ret;
ret = shutdown(fd, SHUT_RD);
if (verbose)
printf("cmd #%d stp #%d: %s(%s=%d): ret=%d%s\n", cmd, cmdstep, __FUNCTION__ + 3, side(fd), fd, ret, get_errno(ret));
}
void do_shw(int fd)
{
int ret;
ret = shutdown(fd, SHUT_WR);
if (verbose)
printf("cmd #%d stp #%d: %s(%s=%d): ret=%d%s\n", cmd, cmdstep, __FUNCTION__ + 3, side(fd), fd, ret, get_errno(ret));
}
void do_shb(int fd)
{
int ret;
ret = shutdown(fd, SHUT_RDWR);
if (verbose)
printf("cmd #%d stp #%d: %s(%s=%d): ret=%d%s\n", cmd, cmdstep, __FUNCTION__ + 3, side(fd), fd, ret, get_errno(ret));
}
void do_lin(int fd)
{
struct linger nolinger = { .l_onoff = 1, .l_linger = 0 };
int ret;
ret = setsockopt(fd, SOL_SOCKET, SO_LINGER, &nolinger, sizeof(nolinger));
if (verbose)
printf("cmd #%d stp #%d: %s(%s=%d): ret=%d%s\n", cmd, cmdstep, __FUNCTION__ + 3, side(fd), fd, ret, get_errno(ret));
}
void do_clo(int fd)
{
int ret;
ret = close(fd);
if (verbose)
printf("cmd #%d stp #%d: %s(%s=%d): ret=%d%s\n", cmd, cmdstep, __FUNCTION__ + 3, side(fd), fd, ret, get_errno(ret));
}
void do_pol(int fd)
{
struct pollfd fds = { .fd = fd, .events = POLLIN|POLLOUT|POLLRDHUP, .revents=0 };
int flags, flag;
int ret;
#ifdef __linux__
while (use_epoll) {
struct epoll_event evt;
static int epoll_fd = -1;
if (epoll_fd == -1)
epoll_fd = epoll_create(1024);
if (epoll_fd == -1)
break;
evt.events = EPOLLIN | EPOLLOUT | EPOLLRDHUP;
evt.data.fd = fd;
epoll_ctl(epoll_fd, EPOLL_CTL_ADD, fd, &evt);
ret = epoll_wait(epoll_fd, &evt, 1, 0);
if (verbose) {
printf("cmd #%d stp #%d: %s(%s=%d): ret=%d%s ev=%#x ", cmd, cmdstep, __FUNCTION__ + 3, side(fd), fd, ret, get_errno(ret), ret > 0 ? evt.events : 0);
if (ret > 0 && evt.events) {
putchar('(');
for (flags = evt.events; flags; flags ^= flag) {
flag = flags ^ (flags & (flags - 1)); // keep lowest bit only
switch (flag) {
case EPOLLIN: printf("IN"); break;
case EPOLLOUT: printf("OUT"); break;
case EPOLLPRI: printf("PRI"); break;
case EPOLLHUP: printf("HUP"); break;
case EPOLLERR: printf("ERR"); break;
case EPOLLRDHUP: printf("RDHUP"); break;
default: printf("???[%#x]", flag); break;
}
if (flags ^ flag)
putchar(' ');
}
putchar(')');
}
putchar('\n');
}
evt.data.fd = fd;
epoll_ctl(epoll_fd, EPOLL_CTL_DEL, fd, &evt);
return;
}
#endif
ret = poll(&fds, 1, 0);
if (verbose) {
printf("cmd #%d stp #%d: %s(%s=%d): ret=%d%s ev=%#x ", cmd, cmdstep, __FUNCTION__ + 3, side(fd), fd, ret, get_errno(ret), ret > 0 ? fds.revents : 0);
if (ret > 0 && fds.revents) {
putchar('(');
for (flags = fds.revents; flags; flags ^= flag) {
flag = flags ^ (flags & (flags - 1)); // keep lowest bit only
switch (flag) {
case POLLIN: printf("IN"); break;
case POLLOUT: printf("OUT"); break;
case POLLPRI: printf("PRI"); break;
case POLLHUP: printf("HUP"); break;
case POLLERR: printf("ERR"); break;
case POLLNVAL: printf("NVAL"); break;
#if POLLRDHUP
case POLLRDHUP: printf("RDHUP"); break;
#endif
default: printf("???[%#x]", flag); break;
}
if (flags ^ flag)
putchar(' ');
}
putchar(')');
}
putchar('\n');
}
}
int main(int argc, char **argv)
{
const char *arg0;
char *word, *next;
int fd;
/* listener */
lfd = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
if (lfd < 0)
die("socket(l)");
setsockopt(lfd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one));
memset(&saddr, 0, sizeof(saddr));
saddr.sin_family = AF_INET;
saddr.sin_port = htons(0);
salen = sizeof(saddr);
if (bind(lfd, (struct sockaddr *)&saddr, salen) < 0)
die("bind()");
if (listen(lfd, 1000) < 0)
die("listen()");
if (getsockname(lfd, (struct sockaddr *)&saddr, &salen) < 0)
die("getsockname()");
/* client */
cfd = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
if (cfd < 0)
die("socket(c)");
arg0 = argv[0];
if (argc < 2) {
usage(arg0);
exit(1);
}
write(1, "#### BEGIN ####\n", 16); // add a visible delimiter in the traces
while (argc > 1) {
argc--; argv++;
if (**argv != '-') {
usage(arg0);
exit(1);
}
fd = -1;
switch (argv[0][1]) {
case 'h' :
usage(arg0);
exit(0);
break;
case 'v' :
verbose++;
break;
case 'e' :
use_epoll = 1;
break;
case 'c' :
cmd++; cmdstep = 0;
if (!connected) {
do_con(cfd);
/* connection is pending in accept queue, accept() will either be
* explicit with "-l acc" below, or implicit on "-s <cmd>"
*/
}
fd = cfd;
break;
case 's' :
cmd++; cmdstep = 0;
if (!connected)
do_con(cfd);
if (sfd < 0)
do_acc(lfd);
if (sfd < 0)
die("accept()");
fd = sfd;
break;
case 'l' :
cmd++; cmdstep = 0;
fd = lfd;
break;
default : usage(arg0); exit(1); break;
}
if (fd >= 0) { /* an action is required */
if (argc < 2) {
usage(arg0);
exit(1);
}
for (word = argv[1]; word && *word; word = next) {
next = strchr(word, ',');
if (next)
*(next++) = 0;
cmdstep++;
if (strcmp(word, "acc") == 0) {
do_acc(fd);
}
else if (strcmp(word, "con") == 0) {
do_con(fd);
}
else if (strcmp(word, "snd") == 0) {
do_snd(fd);
}
else if (strcmp(word, "mor") == 0) {
do_mor(fd);
}
else if (strcmp(word, "rcv") == 0) {
do_rcv(fd);
}
else if (strcmp(word, "drn") == 0) {
do_drn(fd);
}
else if (strcmp(word, "shb") == 0) {
do_shb(fd);
}
else if (strcmp(word, "shr") == 0) {
do_shr(fd);
}
else if (strcmp(word, "shw") == 0) {
do_shw(fd);
}
else if (strcmp(word, "lin") == 0) {
do_lin(fd);
}
else if (strcmp(word, "clo") == 0) {
do_clo(fd);
}
else if (strcmp(word, "pol") == 0) {
do_pol(fd);
}
else {
printf("Ignoring unknown action '%s' in step #%d of cmd #%d\n", word, cmdstep, cmd);
}
}
argc--; argv++;
}
}
write(1, "#### END ####\n", 14); // add a visible delimiter in the traces
if (!cmd) {
printf("No command was requested!\n");
usage(arg0);
exit(1);
}
return 0;
}
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