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io.c
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io.c
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/*
* UX IO functions
* Copyright (C) 2006-2009 Unix Solutions Ltd.
*
* Released under MIT license.
* See LICENSE-MIT.txt for license terms.
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <stdbool.h>
#include <unistd.h>
#include <string.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <sys/utsname.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <poll.h>
#include <fcntl.h>
#include <errno.h>
#include <time.h>
#include "libfuncs.h"
#include "log.h"
static int io_report_errors = 1;
void set_log_io_errors(int report_io_errors) {
io_report_errors = report_io_errors;
}
char * chomp(char *x) {
int i=strlen(x)-1;
while ((i>=0)&&((x[i]=='\n')||(x[i]=='\r')||(x[i]==' ')||(x[i]=='\t'))){
x[i--]=0;
}
return x;
}
ssize_t safe_read(int fd, void *buf, size_t len) {
ssize_t readen;
do {
readen = read(fd, buf, len);
if ((readen < 0) && (errno == EAGAIN || errno == EINTR))
continue;
return readen;
} while (1);
}
ssize_t safe_write(int fd, const void *buf, size_t len) {
ssize_t written;
do {
written = write(fd, buf, len);
if ((written < 0) && (errno == EAGAIN || errno == EINTR))
continue;
return written;
} while (1);
}
void shutdown_fd(int *in_fd) {
if (*in_fd > -1) {
shutdown(*in_fd, SHUT_RDWR);
close(*in_fd);
*in_fd = -1;
}
}
ssize_t fdgetline(int fd, char *buf, size_t buf_size) {
size_t i=0;
int intrs = 0;
int num_timeouts = 0;
struct pollfd fdset[1];
fdset[0].fd = fd;
fdset[0].events = POLLIN;
if (buf_size <= 0 || fd == -1)
return 0;
while (1) {
int fdready = poll(fdset, 1, FDGETLINE_TIMEOUT);
if (fdready == -1) {
if (errno == EINTR) {
if (++intrs < FDGETLINE_RETRIES)
continue;
else
return i;
}
if (num_timeouts++ <= FDGETLINE_RETRIES) {
continue;
} else {
if (io_report_errors)
log_perror("fdgetline() timeout", errno);
}
}
if (fdready == 0 || fdready == -1) { /* Timeout || error */
if (num_timeouts++ <= FDGETLINE_RETRIES)
continue;
return 0;
}
if (safe_read(fd,buf+i,1)!=1) /* Try to read 1 char */
break;
i++;
if (buf[i-1]=='\n')
break;
if (i==buf_size) /* End of buffer reached, get out a here */
return 0;
}
buf[i]='\0';
return i;
}
ssize_t fdread_ex(int fd, char *buf, size_t buf_size, int timeout, int retries, int waitfull) {
ssize_t rbytes = 0;
int intrs = 0;
int num_timeouts = 0;
struct pollfd fdset[1];
fdset[0].fd = fd;
fdset[0].events = POLLIN;
if (buf_size <= 0 || fd == -1)
return 0;
while (1) {
int fdready = poll(fdset, 1, timeout);
if (fdready == -1 || fdready == 0) { /* Timeout || error */
if (errno == EINTR) {
if (++intrs < retries)
continue;
else
return rbytes;
}
if (num_timeouts++ <= retries) {
continue;
} else {
if (timeout && io_report_errors) {
log_perror("fdread() timeout", errno);
}
return rbytes > 0 ? rbytes : -1;
}
}
ssize_t j = safe_read(fd, buf + rbytes, buf_size - rbytes);
if (j < 0) // Error reading
return j;
if (j == 0) { // No data, retry?
if (num_timeouts++ > retries) {
return rbytes;
}
continue;
}
rbytes += j;
if (!waitfull)
return rbytes;
if (rbytes == (ssize_t)buf_size)
return rbytes;
}
return 0;
}
ssize_t fdread(int fd, char *buf, size_t buf_size) {
return fdread_ex(fd, buf, buf_size, FDREAD_TIMEOUT, FDREAD_RETRIES, 1);
}
ssize_t fdread_nowaitfull(int fd, char *buf, size_t buf_size) {
return fdread_ex(fd, buf, buf_size, FDREAD_TIMEOUT, FDREAD_RETRIES, 0);
}
ssize_t fdwrite(int fd, char *buf, size_t buf_size) {
ssize_t wbytes=0;
int intrs = 0;
int num_timeouts = 0;
struct pollfd fdset[1];
fdset[0].fd = fd;
fdset[0].events = POLLOUT | POLLERR | POLLHUP | POLLNVAL | POLLRDHUP;
if (buf_size <= 0 || fd == -1)
return 0;
while (1) {
int fdready = poll(fdset, 1, FDWRITE_TIMEOUT);
if (fdready == -1 || fdready == 0) { /* Timeout || error */
if (errno == EINTR) {
if (++intrs < FDWRITE_RETRIES)
continue;
else
return wbytes;
}
if (num_timeouts++ <= FDWRITE_RETRIES) {
continue;
} else {
if (io_report_errors)
log_perror("fdwrite() timeout", errno);
return wbytes > 0 ? wbytes : -1;
}
}
if (fdready < 1 || (fdready == 1 && fdset[0].revents != POLLOUT)) /* Timeout || error */
return -1;
ssize_t j = safe_write(fd, buf+wbytes, buf_size-wbytes);
if (j < 0) // Error writing
return j;
if (j == 0) { // No data, retry?
if (num_timeouts++ > FDREAD_RETRIES) {
return wbytes;
}
continue;
}
wbytes += j;
if (wbytes == (ssize_t)buf_size)
return wbytes;
}
return 0;
}
int fdputs(int fd, char *msg) {
return fdwrite(fd, msg, strlen(msg));
}
int fdputsf(int fd, char *fmt, ...) {
char msg[2048];
va_list args;
va_start(args, fmt);
vsnprintf(msg, sizeof(msg)-1, fmt, args);
va_end(args);
return fdwrite(fd, msg, strlen(msg));
}
void set_sock_nonblock(int sockfd) {
int arg = fcntl(sockfd, F_GETFL, NULL);
arg |= O_NONBLOCK;
fcntl(sockfd, F_SETFL, arg);
}
void set_sock_block(int sockfd) {
int arg = fcntl(sockfd, F_GETFL, NULL);
arg &= (~O_NONBLOCK);
fcntl(sockfd, F_SETFL, arg);
}
int do_connect(int sockfd, const struct sockaddr *serv_addr, socklen_t addrlen, int timeout) {
set_sock_nonblock(sockfd);
// Trying to connect with timeout
int result = connect(sockfd, serv_addr, addrlen);
if (result < 0) { // Not connected
if (errno != EINPROGRESS) { // Not in progress
return -1;
} else { // Wait a timeout ms for socket to become ready to write into
struct pollfd fdset[1];
fdset[0].fd = sockfd;
fdset[0].events = POLLOUT | POLLERR | POLLHUP | POLLNVAL | POLLRDHUP;
do {
int fdready = poll(fdset, 1, timeout);
if (fdready == -1 && errno == EINTR)
continue;
if (fdready < 1 || (fdready == 1 && fdset[0].revents != POLLOUT)) { // Timeout || error
// Get socket error
unsigned int err_val=0, sz = sizeof(int);
getsockopt(sockfd, SOL_SOCKET, SO_ERROR, (void*)(&err_val), &sz);
errno = err_val;
if (!errno) // It can't be success, so simulate timeout
errno = ENETDOWN;
return -1;
}
break;
} while (1);
}
}
set_sock_block(sockfd);
return 0;
}