On Tue, 2003-12-30 at 04:23, Colin Watson wrote: > This definitely implies to me that you need to define _XOPEN_SOURCE > (__USE_XOPEN may have the same effect but it's supposed to be set by > <features.h>, not the user) in order to get this constant. See 'info > libc "Feature Test Macros"' for information on this kind of thing. Sorry, I was not clear. I defined _XOPEN_SOURCE. But still not working. I'll find the program that do not work in the attachment, and those are the errors: gcc -L./ -lgapil -Wall -g -fPIC poll_echod.c -o pechod poll_echod.c: In function `main': poll_echod.c:167: error: `POLLRDNORM' undeclared (first use in this function) poll_echod.c:167: error: (Each undeclared identifier is reported only once poll_echod.c:167: error: for each function it appears in.)
/* poll_echod.c
*
* Copyright (C) 2003 Simone Piccardi
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or (at
* your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/****************************************************************
*
* Program poll_echod
* Elementary TCP server for echo service (port 7) using poll
*
* Author: Simone Piccardi
* Dec. 2003
*
* Usage: echod -h give all info
*
* $Id$
*
****************************************************************/
/*
* Include needed headers
*/
#include <limits.h> /* system limits */
#include <sys/types.h> /* predefined types */
#include <unistd.h> /* include unix standard library */
#include <arpa/inet.h> /* IP addresses conversion utiliites */
#include <sys/socket.h> /* socket library */
#include <stdio.h> /* include standard I/O library */
#include <time.h>
#include <syslog.h> /* syslog system functions */
#include <signal.h> /* signal functions */
#include <errno.h> /* error code */
#include <string.h> /* error strings */
#include <stdlib.h>
#define _XOPEN_SOURCE
#include <sys/poll.h> /* poll function definition */
#include "macros.h"
#include "Gapil.h"
#define BACKLOG 10
#define MAXLINE 256
int demonize = 1; /* daemon use option: default is daemon */
int debugging = 0; /* debug info printing option: default is no debug */
/* Subroutines declaration */
void usage(void);
void PrintErr(char * error);
/* Program beginning */
int main(int argc, char *argv[])
{
/*
* Variables definition
*/
int waiting = 0;
int compat = 0;
struct sockaddr_in s_addr, c_addr;
socklen_t len;
char buffer[MAXLINE];
struct pollfd *poll_set;
int list_fd, fd;
int max_fd, nread, nwrite;
int i, n = 256;
/*
* Input section: decode parameters passed in the calling
* Use getopt function
*/
opterr = 0; /* don't want writing to stderr */
while ( (i = getopt(argc, argv, "hdicw:n:")) != -1) {
switch (i) {
/*
* Handling options
*/
case 'h':
printf("Wrong -h option use\n");
usage();
return(0);
break;
case 'i':
demonize = 0;
break;
case 'c':
compat = 1;
break;
case 'd':
debugging = 1;
break;
case 'w':
waiting = strtol(optarg, NULL, 10);
break;
case 'n':
n = strtol(optarg, NULL, 10);
break;
case '?': /* unrecognized options */
printf("Unrecognized options -%c\n",optopt);
usage();
default: /* should not reached */
usage();
}
}
/* ***********************************************************
*
* Options processing completed
*
* Main code beginning
*
* ***********************************************************/
/* Main code begin here */
if (compat) { /* install signal handler */
Signal(SIGCHLD, HandSigCHLD); /* non restarting handler */
} else {
SignalRestart(SIGCHLD, HandSigCHLD); /* restarting handler */
}
/* create socket */
if ( (list_fd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
perror("Socket creation error");
exit(1);
}
/* initialize address */
memset((void *)&s_addr, 0, sizeof(s_addr)); /* clear server address */
s_addr.sin_family = AF_INET; /* address type is INET */
s_addr.sin_port = htons(7); /* echo port is 7 */
s_addr.sin_addr.s_addr = htonl(INADDR_ANY); /* connect from anywhere */
/* bind socket */
if (bind(list_fd, (struct sockaddr *)&s_addr, sizeof(s_addr)) < 0) {
perror("bind error");
exit(1);
}
/* release privileges and go daemon */
if (setgid(65534) !=0) { /* first give away group privileges */
perror("cannot give away group privileges");
exit(1);
}
if (setuid(65534) !=0) { /* and only after user ... */
perror("cannot give away user privileges");
exit(1);
}
if (demonize) { /* go daemon */
openlog(argv[0], 0, LOG_DAEMON); /* open logging */
if (daemon(0, 0) != 0) {
perror("cannot start as daemon");
exit(1);
}
}
/* main body */
if (listen(list_fd, BACKLOG) < 0 ) {
PrintErr("listen error");
exit(1);
}
if (waiting) sleep(waiting);
/* initialize all needed variables */
poll_set = (struct pollfd *) malloc(n * sizeof(struct pollfd));
max_fd = list_fd; /* maximum now is listening socket */
for (i=0; i<n; i++) {
poll_set[i].fd = -1;
poll_set[i].events = POLLRDNORM;
}
poll_set[max_fd].fd = list_fd;
/* main loop, wait for connection and data inside a select */
while (1) {
while ( ((n = poll(poll_set, max_fd, -1)) < 0)
&& (errno == EINTR)); /* wait for data or connection */
if (n < 0) { /* on real error exit */
PrintErr("poll error");
exit(1);
}
/* on activity */
debug("Trovati %d socket attivi\n", n);
if (poll_set[list_fd].revents & POLLRDNORM) { /* if new connection */
n--; /* decrement active */
len = sizeof(c_addr); /* and call accept */
if ((fd = accept(list_fd, (struct sockaddr *)&c_addr, &len)) < 0) {
PrintErr("accept error");
exit(1);
}
debug("Connessione su fd %d restano %d socket attivi\n", fd, n);
poll_set[fd].fd = fd; /* set new connection socket */
if (max_fd < fd) max_fd = fd; /* if needed set new maximum */
debug("max_fd=%d\n", max_fd);
}
/* loop on open connections */
i = list_fd; /* first socket to look */
while (n != 0) { /* loop until active */
i++; /* start after listening socket */
debug("restano %d socket, fd %d\n", n, fd);
if (poll_set[i].fd == -1) continue; /* closed, go next */
if (poll_set[i].revents & (POLLRDNORM|POLLERR)) { /* if active process it*/
n--; /* decrease active */
debug("dati su fd %d\n", i);
nread = read(i, buffer, MAXLINE); /* read operations */
if (nread < 0) {
PrintErr("Errore in lettura");
exit(1);
}
if (nread == 0) { /* if closed connection */
debug("fd %d chiuso\n", i);
close(i); /* close file */
poll_set[i].fd = -1; /* mark as closed in table */
if (max_fd == i) { /* if was the maximum */
while (poll_set[--i].fd == -1); /* loop down */
max_fd = i; /* set new maximum */
debug("nuovo max_fd %d\n", max_fd);
break; /* and go back to select */
}
continue; /* continue loop on open */
}
nwrite = FullWrite(i, buffer, nread); /* write data */
if (nwrite) {
PrintErr("Errore in scrittura");
exit(1);
}
}
}
}
/* normal exit, never reached */
exit(0);
}
/*
* routine to print usage info and exit
*/
void usage(void) {
printf("Elementary echo server\n");
printf("Usage:\n");
printf(" echod [-h] \n");
printf(" -h print this help\n");
printf(" -d write debug info\n");
printf(" -i use interactively\n");
printf(" -c disable BSD semantics\n");
printf(" -w N wait N sec. before calling accept\n");
exit(1);
}
/*
* routine to print error on stout or syslog
*/
void PrintErr(char * error) {
if (demonize) { /* daemon mode */
syslog(LOG_ERR, "%s: %m", error); /* log string and error message */
} else {
perror(error);
}
return;
}
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