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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /arch/um/drivers/pty.c | |
parent | Initial commit. (diff) | |
download | linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip |
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | arch/um/drivers/pty.c | 165 |
1 files changed, 165 insertions, 0 deletions
diff --git a/arch/um/drivers/pty.c b/arch/um/drivers/pty.c new file mode 100644 index 000000000..39c60068c --- /dev/null +++ b/arch/um/drivers/pty.c @@ -0,0 +1,165 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) + */ + +#include <stdio.h> +#include <stdlib.h> +#include <unistd.h> +#include <errno.h> +#include <fcntl.h> +#include <string.h> +#include <termios.h> +#include <sys/stat.h> +#include "chan_user.h" +#include <os.h> +#include <um_malloc.h> + +struct pty_chan { + void (*announce)(char *dev_name, int dev); + int dev; + int raw; + struct termios tt; + char dev_name[sizeof("/dev/pts/0123456\0")]; +}; + +static void *pty_chan_init(char *str, int device, const struct chan_opts *opts) +{ + struct pty_chan *data; + + data = uml_kmalloc(sizeof(*data), UM_GFP_KERNEL); + if (data == NULL) + return NULL; + + *data = ((struct pty_chan) { .announce = opts->announce, + .dev = device, + .raw = opts->raw }); + return data; +} + +static int pts_open(int input, int output, int primary, void *d, + char **dev_out) +{ + struct pty_chan *data = d; + char *dev; + int fd, err; + + fd = get_pty(); + if (fd < 0) { + err = -errno; + printk(UM_KERN_ERR "open_pts : Failed to open pts\n"); + return err; + } + + if (data->raw) { + CATCH_EINTR(err = tcgetattr(fd, &data->tt)); + if (err) + goto out_close; + + err = raw(fd); + if (err) + goto out_close; + } + + dev = ptsname(fd); + sprintf(data->dev_name, "%s", dev); + *dev_out = data->dev_name; + + if (data->announce) + (*data->announce)(dev, data->dev); + + return fd; + +out_close: + close(fd); + return err; +} + +static int getmaster(char *line) +{ + struct stat buf; + char *pty, *bank, *cp; + int master, err; + + pty = &line[strlen("/dev/ptyp")]; + for (bank = "pqrs"; *bank; bank++) { + line[strlen("/dev/pty")] = *bank; + *pty = '0'; + /* Did we hit the end ? */ + if ((stat(line, &buf) < 0) && (errno == ENOENT)) + break; + + for (cp = "0123456789abcdef"; *cp; cp++) { + *pty = *cp; + master = open(line, O_RDWR); + if (master >= 0) { + char *tp = &line[strlen("/dev/")]; + + /* verify slave side is usable */ + *tp = 't'; + err = access(line, R_OK | W_OK); + *tp = 'p'; + if (!err) + return master; + close(master); + } + } + } + + printk(UM_KERN_ERR "getmaster - no usable host pty devices\n"); + return -ENOENT; +} + +static int pty_open(int input, int output, int primary, void *d, + char **dev_out) +{ + struct pty_chan *data = d; + int fd, err; + char dev[sizeof("/dev/ptyxx\0")] = "/dev/ptyxx"; + + fd = getmaster(dev); + if (fd < 0) + return fd; + + if (data->raw) { + err = raw(fd); + if (err) { + close(fd); + return err; + } + } + + if (data->announce) + (*data->announce)(dev, data->dev); + + sprintf(data->dev_name, "%s", dev); + *dev_out = data->dev_name; + + return fd; +} + +const struct chan_ops pty_ops = { + .type = "pty", + .init = pty_chan_init, + .open = pty_open, + .close = generic_close, + .read = generic_read, + .write = generic_write, + .console_write = generic_console_write, + .window_size = generic_window_size, + .free = generic_free, + .winch = 0, +}; + +const struct chan_ops pts_ops = { + .type = "pts", + .init = pty_chan_init, + .open = pts_open, + .close = generic_close, + .read = generic_read, + .write = generic_write, + .console_write = generic_console_write, + .window_size = generic_window_size, + .free = generic_free, + .winch = 0, +}; |