mirror of https://gitee.com/openkylin/linux.git
61 lines
1.0 KiB
C
61 lines
1.0 KiB
C
/*
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* Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
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* Licensed under the GPL
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*/
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#include <stdlib.h>
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#include <unistd.h>
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#include <errno.h>
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#include <fcntl.h>
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#include "kern_util.h"
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#include "os.h"
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struct grantpt_info {
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int fd;
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int res;
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int err;
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};
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static void grantpt_cb(void *arg)
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{
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struct grantpt_info *info = arg;
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info->res = grantpt(info->fd);
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info->err = errno;
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}
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int get_pty(void)
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{
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struct grantpt_info info;
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int fd, err;
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fd = open("/dev/ptmx", O_RDWR);
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if (fd < 0) {
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err = -errno;
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printk(UM_KERN_ERR "get_pty : Couldn't open /dev/ptmx - "
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"err = %d\n", errno);
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return err;
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}
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info.fd = fd;
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initial_thread_cb(grantpt_cb, &info);
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if (info.res < 0) {
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err = -info.err;
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printk(UM_KERN_ERR "get_pty : Couldn't grant pty - "
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"errno = %d\n", -info.err);
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goto out;
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}
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if (unlockpt(fd) < 0) {
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err = -errno;
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printk(UM_KERN_ERR "get_pty : Couldn't unlock pty - "
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"errno = %d\n", errno);
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goto out;
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}
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return fd;
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out:
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close(fd);
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return err;
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}
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