cregit-Linux how code gets into the kernel

Release 4.14 arch/alpha/include/asm/termios.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ALPHA_TERMIOS_H

#define _ALPHA_TERMIOS_H

#include <uapi/asm/termios.h>

/*      eof=^D          eol=\0          eol2=\0         erase=del
        werase=^W       kill=^U         reprint=^R      sxtc=\0
        intr=^C         quit=^\         susp=^Z         <OSF/1 VDSUSP>
        start=^Q        stop=^S         lnext=^V        discard=^U
        vmin=\1         vtime=\0
*/

#define INIT_C_CC "\004\000\000\177\027\025\022\000\003\034\032\000\021\023\026\025\001\000"

/*
 * Translate a "termio" structure into a "termios". Ugh.
 */


#define user_termio_to_kernel_termios(a_termios, u_termio)			\
({                                                                              \
        struct ktermios *k_termios = (a_termios);                               \
        struct termio k_termio;                                                 \
        int canon, ret;                                                         \
                                                                                \
        ret = copy_from_user(&k_termio, u_termio, sizeof(k_termio));            \
        if (!ret) {                                                             \
		/* Overwrite only the low bits.  */				\
                *(unsigned short *)&k_termios->c_iflag = k_termio.c_iflag;      \
                *(unsigned short *)&k_termios->c_oflag = k_termio.c_oflag;      \
                *(unsigned short *)&k_termios->c_cflag = k_termio.c_cflag;      \
                *(unsigned short *)&k_termios->c_lflag = k_termio.c_lflag;      \
                canon = k_termio.c_lflag & ICANON;                              \
                                                                                \
                k_termios->c_cc[VINTR]  = k_termio.c_cc[_VINTR];                \
                k_termios->c_cc[VQUIT]  = k_termio.c_cc[_VQUIT];                \
                k_termios->c_cc[VERASE] = k_termio.c_cc[_VERASE];               \
                k_termios->c_cc[VKILL]  = k_termio.c_cc[_VKILL];                \
                k_termios->c_cc[VEOL2]  = k_termio.c_cc[_VEOL2];                \
                k_termios->c_cc[VSWTC]  = k_termio.c_cc[_VSWTC];                \
                k_termios->c_cc[canon ? VEOF : VMIN]  = k_termio.c_cc[_VEOF];   \
                k_termios->c_cc[canon ? VEOL : VTIME] = k_termio.c_cc[_VEOL];   \
        }                                                                       \
        ret;                                                                    \
})

/*
 * Translate a "termios" structure into a "termio". Ugh.
 *
 * Note the "fun" _VMIN overloading.
 */

#define kernel_termios_to_user_termio(u_termio, a_termios)		\
({                                                                      \
        struct ktermios *k_termios = (a_termios);                       \
        struct termio k_termio;                                         \
        int canon;                                                      \
                                                                        \
        k_termio.c_iflag = k_termios->c_iflag;                          \
        k_termio.c_oflag = k_termios->c_oflag;                          \
        k_termio.c_cflag = k_termios->c_cflag;                          \
        canon = (k_termio.c_lflag = k_termios->c_lflag) & ICANON;       \
                                                                        \
        k_termio.c_line = k_termios->c_line;                            \
        k_termio.c_cc[_VINTR]  = k_termios->c_cc[VINTR];                \
        k_termio.c_cc[_VQUIT]  = k_termios->c_cc[VQUIT];                \
        k_termio.c_cc[_VERASE] = k_termios->c_cc[VERASE];               \
        k_termio.c_cc[_VKILL]  = k_termios->c_cc[VKILL];                \
        k_termio.c_cc[_VEOF]   = k_termios->c_cc[canon ? VEOF : VMIN];  \
        k_termio.c_cc[_VEOL]   = k_termios->c_cc[canon ? VEOL : VTIME]; \
        k_termio.c_cc[_VEOL2]  = k_termios->c_cc[VEOL2];                \
        k_termio.c_cc[_VSWTC]  = k_termios->c_cc[VSWTC];                \
                                                                        \
        copy_to_user(u_termio, &k_termio, sizeof(k_termio));            \
})


#define user_termios_to_kernel_termios(k, u) \
	copy_from_user(k, u, sizeof(struct termios))


#define kernel_termios_to_user_termios(u, k) \
	copy_to_user(u, k, sizeof(struct termios))

#endif	/* _ALPHA_TERMIOS_H */

Overall Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)5893.55%562.50%
Al Viro23.23%112.50%
Greg Kroah-Hartman11.61%112.50%
David Howells11.61%112.50%
Total62100.00%8100.00%
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