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/*
* io_helpers.c - I/O helper functions for the firmware loader
* This file is part of:
*
* Firmware loader for Samsung I9100 and I9250
* Copyright (C) 2012 Alexander Tarasikov <alexander.tarasikov@gmail.com>
*
* based on the incomplete C++ implementation which is
* Copyright (C) 2012 Sergey Gridasov <grindars@gmail.com>
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*/
#include "io_helpers.h"
#include "log.h"
#define DEFAULT_TIMEOUT 50
int c_ioctl(int fd, unsigned long code, void* data) {
int ret;
if (!data) {
ret = ioctl(fd, code);
}
else {
ret = ioctl(fd, code, data);
}
if (ret < 0) {
_e("ioctl fd=%d code=%lx failed: %s", fd, code, strerror(errno));
}
else {
_d("ioctl fd=%d code=%lx OK", fd, code);
}
return ret;
}
int read_select(int fd, unsigned timeout) {
struct timeval tv = {
tv.tv_sec = timeout / 1000,
tv.tv_usec = 1000 * (timeout % 1000),
};
fd_set read_set;
FD_ZERO(&read_set);
FD_SET(fd, &read_set);
return select(fd + 1, &read_set, 0, 0, &tv);
}
int receive(int fd, void *buf, size_t size) {
int ret;
if ((ret = read_select(fd, DEFAULT_TIMEOUT)) < 1) {
_e("%s: failed to select the fd %d", __func__, fd);
return ret;
}
else {
_d("%s: selected %d fds for fd=%d", __func__, ret, fd);
}
return read(fd, buf, size);
}
int expect_data(int fd, void *data, size_t size) {
int ret;
char buf[size];
if ((ret = receive(fd, buf, size)) != size) {
ret = -1;
_e("failed to receive data");
return ret;
}
ret = memcmp(buf, data, size);
hexdump(buf, size);
return ret;
}
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