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/* Released under GPLv2 with exception for the OpenSSL library. See license.txt */
#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <syslog.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include "gen.h"
ssize_t read_to(int fd, char *whereto, size_t len, int timeout)
{
for(;;)
{
ssize_t rc;
struct timeval to;
fd_set rfds;
FD_ZERO(&rfds);
FD_SET(fd, &rfds);
to.tv_sec = timeout / 1000;
to.tv_usec = (timeout - (to.tv_sec * 1000)) * 1000;
rc = select(fd + 1, &rfds, NULL, NULL, &to);
if (rc == 0)
return RC_TIMEOUT;
else if (rc == -1)
{
if (errno == EINTR || errno == EAGAIN)
continue;
snprintf(last_error, sizeof last_error, "myread::select failed: %s\n", strerror(errno));
return RC_SHORTREAD;
}
return read(fd, whereto, len);
}
}
ssize_t myread(int fd, char *whereto, size_t len, int timeout)
{
ssize_t cnt=0;
while(len>0)
{
ssize_t rc;
struct timeval to;
fd_set rfds;
FD_ZERO(&rfds);
FD_SET(fd, &rfds);
to.tv_sec = timeout / 1000;
to.tv_usec = (timeout - (to.tv_sec * 1000)) * 1000;
rc = select(fd + 1, &rfds, NULL, NULL, &to);
if (rc == 0)
return RC_TIMEOUT;
else if (rc == -1)
{
if (errno == EINTR || errno == EAGAIN)
continue;
snprintf(last_error, sizeof last_error, "myread::select failed: %s\n", strerror(errno));
return RC_SHORTREAD;
}
if (FD_ISSET(fd, &rfds))
{
rc = read(fd, whereto, len);
if (rc == -1)
{
if (errno != EINTR && errno != EAGAIN)
{
snprintf(last_error, sizeof last_error, "myread::read failed: %s\n", strerror(errno));
return RC_SHORTREAD;
}
}
else if (rc == 0)
{
break;
}
else
{
whereto += rc;
len -= rc;
cnt += rc;
}
}
}
return cnt;
}
ssize_t mywrite(int fd, char *wherefrom, size_t len, int timeout)
{
ssize_t cnt=0;
while(len>0)
{
ssize_t rc;
struct timeval to;
fd_set wfds;
FD_ZERO(&wfds);
FD_SET(fd, &wfds);
to.tv_sec = timeout / 1000;
to.tv_usec = (timeout - (to.tv_sec * 1000)) * 1000;
rc = select(fd + 1, NULL, &wfds, NULL, &to);
if (rc == 0)
return -2;
else if (rc == -1)
{
if (errno == EINTR || errno == EAGAIN)
continue;
snprintf(last_error, sizeof last_error, "mywrite::select failed: %s\n", strerror(errno));
return -1;
}
rc = write(fd, wherefrom, len);
if (rc == -1)
{
if (errno != EINTR && errno != EAGAIN)
{
snprintf(last_error, sizeof last_error, "mywrite::write failed: %s\n", strerror(errno));
return -1;
}
}
else if (rc == 0)
{
break;
}
else
{
wherefrom += rc;
len -= rc;
cnt += rc;
}
}
return cnt;
}
int set_fd_nonblocking(int fd)
{
/* set fd to non-blocking */
if (fcntl(fd, F_SETFL, O_NONBLOCK) == -1)
{
fprintf(stderr, "set_fd_nonblocking failed! (%s)\n", strerror(errno));
return -1;
}
return 0;
}
int set_fd_blocking(int fd)
{
/* set fd to blocking */
if (fcntl(fd, F_SETFL, 0) == -1)
{
fprintf(stderr, "set_fd_blocking failed! (%s)\n", strerror(errno));
return -1;
}
return 0;
}
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