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pty: show associative slave of ptmx in fdinfo
This patch adds "tty-index" field to /proc/PID/fdinfo/N if N specifies /dev/ptmx. The field shows the index of associative slave pts. Though a minor number is given for each pts instance, ptmx is not. It means there is no way in user-space to know the association between file descriptors for pts/n and ptmx. (n = 0, 1, ...) This is different from pipe. About pipe such association can be solved by inode of pipefs. Providing the way to know the association between pts/n and ptmx helps users understand the status of running system. lsof can utilize this field. Signed-off-by: Masatake YAMATO <yamato@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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3 changed files with 18 additions and 1 deletions
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@ -243,6 +243,7 @@
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#include <linux/list.h>
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#include <linux/cdev.h>
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#include <linux/termios.h>
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#include <linux/seq_file.h>
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struct tty_struct;
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struct tty_driver;
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@ -285,6 +286,7 @@ struct tty_operations {
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int (*set_termiox)(struct tty_struct *tty, struct termiox *tnew);
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int (*get_icount)(struct tty_struct *tty,
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struct serial_icounter_struct *icount);
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void (*show_fdinfo)(struct tty_struct *tty, struct seq_file *m);
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#ifdef CONFIG_CONSOLE_POLL
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int (*poll_init)(struct tty_driver *driver, int line, char *options);
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int (*poll_get_char)(struct tty_driver *driver, int line);
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