mirror of
https://github.com/SCST-project/scst.git
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f549829482
git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@7396 d57e44dd-8a1f-0410-8b47-8ef2f437770f
131 lines
2.9 KiB
C
131 lines
2.9 KiB
C
/*
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* Copyright (C) 2007 - 2018 Vladislav Bolkhovitin
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* Copyright (C) 2007 - 2018 Western Digital Corporation
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation, version 2
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* of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <fcntl.h>
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#include <sys/socket.h>
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#include <netinet/tcp.h>
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#include <string.h>
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#include <errno.h>
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#include <stdio.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include "iscsid.h"
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static int driver_major(const char *dev)
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{
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FILE *f;
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char devname[256];
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char buf[256];
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int devn;
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f = fopen("/proc/devices", "r");
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if (!f) {
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devn = -errno;
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perror("Cannot open control path to the driver");
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goto out;
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}
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devn = -ENOENT;
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while (fgets(buf, sizeof(buf), f)) {
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if (sscanf(buf, "%d %s", &devn, devname) == 2 &&
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devn > 0 && strcmp(devname, dev) == 0)
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break;
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devn = -ENOENT;
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}
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fclose(f);
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if (devn < 0)
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printf("cannot find %s in /proc/devices - "
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"make sure the module is loaded\n", dev);
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out:
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return devn;
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}
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int create_and_open_dev(const char *dev, int readonly)
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{
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char devname[256];
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int devn;
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int ctlfd = -1;
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int err;
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int flags;
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devn = driver_major(dev);
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if (devn < 0) {
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err = devn;
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goto out;
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}
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sprintf(devname, "/dev/%s", dev);
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unlink(devname);
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if (mknod(devname, (S_IFCHR | 0600), (devn << 8))) {
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err = -errno;
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printf("cannot create %s %s\n", devname, strerror(errno));
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goto out;
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}
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if (readonly)
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flags = O_RDONLY;
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else
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flags = O_RDWR;
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err = ctlfd = open(devname, flags);
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if (ctlfd < 0) {
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err = -errno;
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printf("cannot open %s %s\n", devname, strerror(errno));
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goto out;
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}
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out:
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return err;
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}
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void set_non_blocking(int fd)
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{
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int res = fcntl(fd, F_GETFL);
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if (res != -1) {
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res = fcntl(fd, F_SETFL, res | O_NONBLOCK);
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if (res)
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log_warning("unable to set fd flags (%s)!", strerror(errno));
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} else
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log_warning("unable to get fd flags (%s)!", strerror(errno));
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}
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void sock_set_keepalive(int sock, int timeout)
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{
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if (timeout) { /* timeout [s] */
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int opt = 2;
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if (setsockopt(sock, SOL_TCP, TCP_KEEPCNT, &opt, sizeof(opt)))
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log_warning("unable to set TCP_KEEPCNT on server socket (%s)!", strerror(errno));
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if (setsockopt(sock, SOL_TCP, TCP_KEEPIDLE, &timeout, sizeof(timeout)))
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log_warning("unable to set TCP_KEEPIDLE on server socket (%s)!", strerror(errno));
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opt = 3;
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if (setsockopt(sock, SOL_TCP, TCP_KEEPINTVL, &opt, sizeof(opt)))
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log_warning("unable to set KEEPINTVL on server socket (%s)!", strerror(errno));
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opt = 1;
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if (setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, &opt, sizeof(opt)))
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log_warning("unable to set SO_KEEPALIVE on server socket (%s)!", strerror(errno));
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}
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}
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