| 1 | |
| 2 | |
| 3 | * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
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| 4 |
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| 5 |
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| 6 | #include <stdlib.h>
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| 7 | #include <unistd.h>
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| 8 | #include <errno.h>
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| 9 | #include <fcntl.h>
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| 10 | #include <kern_util.h>
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| 11 | #include <os.h>
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| 12 |
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| 13 | struct grantpt_info {
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| 14 | int fd;
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| 15 | int res;
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| 16 | int err;
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| 17 | };
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| 18 |
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| 19 | static void grantpt_cb(void *arg)
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| 20 | {
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| 21 | struct grantpt_info *info = arg;
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| 22 |
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| 23 | info->res = grantpt(info->fd);
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| 24 | info->err = errno;
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| 25 | }
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| 26 |
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| 27 | int get_pty(void)
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| 28 | {
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| 29 | struct grantpt_info info;
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| 30 | int fd, err;
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| 31 |
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| 32 | fd = open("/dev/ptmx", O_RDWR);
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| 33 | if (fd < 0) {
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| 34 | err = -errno;
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| 35 | printk(UM_KERN_ERR "get_pty : Couldn't open /dev/ptmx - "
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| 36 | "err = %d\n", errno);
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| 37 | return err;
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| 38 | }
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| 39 |
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| 40 | info.fd = fd;
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| 41 | initial_thread_cb(grantpt_cb, &info);
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| 42 |
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| 43 | if (info.res < 0) {
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| 44 | err = -info.err;
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| 45 | printk(UM_KERN_ERR "get_pty : Couldn't grant pty - "
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| 46 | "errno = %d\n", -info.err);
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| 47 | goto out;
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| 48 | }
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| 49 |
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| 50 | if (unlockpt(fd) < 0) {
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| 51 | err = -errno;
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| 52 | printk(UM_KERN_ERR "get_pty : Couldn't unlock pty - "
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| 53 | "errno = %d\n", errno);
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| 54 | goto out;
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| 55 | }
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| 56 | return fd;
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| 57 | out:
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| 58 | close(fd);
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| 59 | return err;
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| 60 | }
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