[PATCH 13/13] linux/termios: regression test for termios speed functions
Adhemerval Zanella Netto
adhemerval.zanella@linaro.org
Thu Jun 5 12:06:54 GMT 2025
On 02/06/25 21:03, H. Peter Anvin wrote:
> From: "H. Peter Anvin" (Intel) <hpa@zytor.com>
>
> Test that runs through a fairly large combination of the various
> termios speed functions, for the new speed_t interface, for the old
> speed_t interface (if enabled), and for the new baud_t interface.
>
> [ v5.1: clean up the definition of the VERIFY and CHECK macros ]
> [ v5.2: make sure Makefile is sorted to prevent lint error ]
>
> Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com>
I think you forgot to check on the rest of the previous review [1],
where I think it would be better to use our libsupport macros at
support/check.h instead of reimplement them (as with ERROR), along
with other remarks.
The test now passes on all architectures.
[1] https://sourceware.org/pipermail/libc-alpha/2025-May/167084.html
> ---
> sysdeps/unix/sysv/linux/Makefile | 1 +
> sysdeps/unix/sysv/linux/tst-termios-linux.c | 610 ++++++++++++++++++
> .../sysv/linux/tst-termios-speed-tables.c | 86 +++
> 3 files changed, 697 insertions(+)
> create mode 100644 sysdeps/unix/sysv/linux/tst-termios-linux.c
> create mode 100644 sysdeps/unix/sysv/linux/tst-termios-speed-tables.c
>
> diff --git a/sysdeps/unix/sysv/linux/Makefile b/sysdeps/unix/sysv/linux/Makefile
> index a14b8c1f6181..913fe736bc18 100644
> --- a/sysdeps/unix/sysv/linux/Makefile
> +++ b/sysdeps/unix/sysv/linux/Makefile
> @@ -236,6 +236,7 @@ tests += \
> tst-sysvmsg-linux \
> tst-sysvsem-linux \
> tst-sysvshm-linux \
> + tst-termios-linux \
> tst-tgkill \
> tst-timerfd \
> tst-ttyname-direct \
> diff --git a/sysdeps/unix/sysv/linux/tst-termios-linux.c b/sysdeps/unix/sysv/linux/tst-termios-linux.c
> new file mode 100644
> index 000000000000..9b9b3f984ca9
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/tst-termios-linux.c
> @@ -0,0 +1,610 @@
> +/* Linux termios regression tests
> +
> + Copyright (C) 2025 Free Software Foundation, Inc.
> + This file is part of the GNU C Library.
> +
> + The GNU C Library is free software; you can redistribute it and/or
> + modify it under the terms of the GNU Lesser General Public License as
> + published by the Free Software Foundation; either version 2.1 of the
> + License, or (at your option) any later version.
> +
> + The GNU C Library is distributed in the hope that it will be useful,
> + but WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + Lesser General Public License for more details.
> +
> + You should have received a copy of the GNU Lesser General Public
> + License along with the GNU C Library; see the file COPYING.LIB. If
> + not, see <https://www.gnu.org/licenses/>. */
> +
> +#include <errno.h>
> +#include <fcntl.h>
> +#include <limits.h>
> +#include <stdbool.h>
> +#include <stdio.h>
> +#include <stdlib.h>
> +#include <string.h>
> +#include <sys/ioctl.h>
> +#include <termios.h>
> +#include <unistd.h>
> +
> +#include <shlib-compat.h>
> +
> +#include <support/check.h>
> +#include <support/namespace.h>
> +#include <support/support.h>
> +#include <support/temp_file.h>
> +#include <support/test-driver.h>
> +#include <support/xunistd.h>
> +
> +/* generic utilities */
> +static unsigned int errors;
> +
> +struct where {
> + const char *file;
> + const char *func;
> + int line;
> +};
> +typedef const struct where *where_t;
> +
> +#define HERE \
> + ({ \
> + static const struct where here = { __FILE__, __func__, __LINE__ }; \
> + &here; \
> + })
> +#define ERROR(where, msg, ...) \
> + do { \
> + const where_t _w = where; \
> + errors++; \
> + printf ("error: %s:%s:%d: " msg "\n", \
> + _w->file, _w->func, _w->line , ## __VA_ARGS__); \
> + } while (0)
> +
> +static void verify_failed (where_t where, const char *expr,
> + const char *test, bool bad)
> +{
> + ERROR(where, "%s%s%s %s%s%s",
> + bad ? "assertion " : "",
> + expr,
> + bad ? test : "",
> + bad ? (errno ? "failed and " : "failed") : "",
> + errno ? "set errno: " : "",
> + errno ? strerror(errno) : "");
> +}
> +
> +static inline void verify_check (where_t where, const char *expr,
> + const char *test, bool good)
> +{
> + bool bad = !good;
> + if (__builtin_expect (bad || errno, 0))
> + verify_failed (where, expr, test, bad);
> +}
> +
> +/* Evaluate an expression and verify a specific predicate as well
> + as errno not being set by the expression. */
> +#define VERIFY(expr,op,res) \
> + ({ \
> + const __auto_type _r = (res); \
> + errno = 0; \
> + __auto_type _v = (expr); \
> + verify_check (HERE, #expr, " " #op " " #res, _v op _r); \
> + _v; \
> + })
> +
> +/* Check for zero (useful for return values) or just for errno being set */
> +#define CHECKZERO(expr) VERIFY (expr,==,0)
> +#define CHECKERR(expr) VERIFY (expr,||,1)
> +
> +/* Speed function tests */
> +
> +#define BOGUS ((speed_t)-1)
> +#define ANY ((speed_t)-2)
> +
> +#include "tst-termios-speed-tables.c"
> +
> +/* These intentionally are a separate implementation from speed.c;
> + these should be "trivially correct" and don't need to be optimized
> + in any way */
> +
> +/* Returns __BOTHER if there is no legacy value for this speed */
> +static speed_t speed_to_cbaud (speed_t speed)
> +{
> + const struct cbaud_table *ct;
> + for (ct = cbaud_table; ct->speed != ANY; ct++)
> + {
> + if (ct->speed == speed)
> + break;
> + }
> + return ct->cbaud;
> +}
> +
> +/* Returns ANY if cbaud is __BOTHER, or BOGUS if invalid */
> +static speed_t cbaud_to_speed (speed_t cbaud)
> +{
> + const struct cbaud_table *ct;
> + for (ct = cbaud_table; ct->cbaud != BOGUS; ct++)
> + {
> + if (ct->cbaud == cbaud)
> + break;
> + }
> + return ct->speed;
> +}
> +
> +static const char *cbaud_name (speed_t cbaud)
> +{
> + const struct cbaud_table *ct;
> + for (ct = cbaud_table; ct->cbaud != BOGUS; ct++)
> + {
> + if (ct->cbaud == cbaud)
> + break;
> + }
> + return ct->name;
> +}
> +
> +static void check_speed (where_t where, speed_t expected,
> + speed_t speed, speed_t cbaud,
> + speed_t cfspeed, baud_t cfbaud,
> + char io)
> +{
> + speed_t want_cbaud;
> + cbaud &= CBAUD;
> +
> + if (expected != ANY && speed != expected)
> + {
> + ERROR (where, "c_%cspeed = %u, expected %u",
> + io, speed, expected);
> + return;
> + }
> + if (cfspeed != speed)
> + {
> + ERROR (where, "cfget%cspeed = %u, expected %u",
> + io, cfspeed, speed);
> + return;
> + }
> + if (cfbaud != cfspeed)
> + {
> + ERROR (where, "cfget%cbaud = %u, but cfget%cspeed = %u",
> + io, cfbaud, io, cfspeed);
> + return;
> + }
> + want_cbaud = speed_to_cbaud (speed);
> + if (cbaud != want_cbaud) {
> + ERROR (where, "c_%cspeed = %u: %s = %s (%06o), should be %s (%06o)",
> + io, speed,
> + io == 'o' ? "CBAUD" : "CIBAUD", cbaud_name (cbaud), cbaud,
> + cbaud_name (want_cbaud), want_cbaud);
> + return;
> + }
> +}
> +
> +/* Validate that the speeds in the struct termios are properly normalized.
> + The difference is the handling of ispeed == 0. */
> +
> +/* Use this after cfset* () */
> +static void check_speeds_cf (where_t where, const struct termios *tio_p,
> + speed_t ospeed, speed_t ispeed)
> +{
> + check_speed (where, ospeed,
> + tio_p->c_ospeed, tio_p->c_cflag,
> + CHECKERR (cfgetospeed (tio_p)),
> + CHECKERR (cfgetobaud (tio_p)), 'o');
> + check_speed (where, ispeed,
> + tio_p->c_ispeed, tio_p->c_cflag >> IBSHIFT,
> + CHECKERR (cfgetispeed (tio_p)),
> + CHECKERR (cfgetibaud (tio_p)), 'i');
> +}
> +
> +/* Use this after tc[gs]etattr () */
> +static void check_speeds_tc (where_t where, int fd,
> + speed_t ospeed, speed_t ispeed)
> +{
> + struct termios tio;
> +
> + CHECKZERO (tcgetattr (fd, &tio));
> + check_speeds_cf (where, &tio, ospeed, ispeed ? ispeed : ospeed);
> +}
> +
> +/* For search and replace convenience */
> +#define check_bauds_cf check_speeds_cf
> +#define check_bauds_tc check_speeds_tc
> +
> +/* Common routine for setting speeds, with checking */
> +static void
> +set_speeds (int fd, speed_t ospeed, speed_t ispeed)
> +{
> + struct termios tio;
> +
> + CHECKZERO (tcgetattr (fd, &tio));
> + CHECKZERO (cfsetospeed (&tio, ospeed));
> + CHECKZERO (cfsetispeed (&tio, ispeed));
> + check_speeds_cf (HERE, &tio, ospeed, ispeed);
> + CHECKZERO (tcsetattr (fd, TCSANOW, &tio));
> + check_speeds_tc (HERE, fd, ospeed, ispeed ? ispeed : ospeed);
> +}
> +
> +/* Actual tests */
> +
> +typedef void (*speed_test_t)(int ttyfd, speed_t speed);
> +static void
> +run_speed_test (int fd, speed_test_t test);
> +
> +/* New interface cfset*speed test */
> +static void
> +new_cfspeed_test (int fd, speed_t speed)
> +{
> + struct termios tio;
> + speed_t old_ospeed, old_ispeed;
> +
> + CHECKZERO (tcgetattr (fd, &tio));
> + old_ospeed = CHECKERR (cfgetospeed (&tio));
> + old_ispeed = CHECKERR (cfgetispeed (&tio));
> +
> + /* Check initial normalization */
> + check_speeds_cf (HERE, &tio, old_ospeed, old_ispeed);
> +
> + /* Check cfset*speed normalization */
> + CHECKZERO (cfsetospeed (&tio, speed));
> + check_speeds_cf (HERE, &tio, speed, old_ispeed);
> + CHECKZERO (cfsetispeed (&tio, speed));
> + check_speeds_cf (HERE, &tio, speed, speed);
> + CHECKZERO (cfsetospeed (&tio, old_ospeed));
> + check_speeds_cf (HERE, &tio, old_ospeed, speed);
> + CHECKZERO (cfsetispeed (&tio, B0));
> + check_speeds_cf (HERE, &tio, old_ospeed, B0);
> + CHECKZERO (cfsetspeed (&tio, speed));
> + check_speeds_cf (HERE, &tio, speed, speed);
> + CHECKZERO (cfsetospeed (&tio, old_ospeed));
> + CHECKZERO (cfsetispeed (&tio, old_ispeed));
> + check_speeds_cf (HERE, &tio, old_ospeed, old_ispeed);
> +}
> +
> +/* New interface cfset*speed test with tcsetattr */
> +static void
> +new_tcspeed_test (int fd, speed_t speed)
> +{
> + struct termios tio;
> + speed_t old_ospeed, old_ispeed;
> +
> + CHECKZERO (tcgetattr (fd, &tio));
> + old_ospeed = CHECKERR (cfgetospeed (&tio));
> + old_ispeed = CHECKERR (cfgetispeed (&tio));
> +
> + /* Check initial normalization */
> + check_speeds_cf (HERE, &tio, old_ospeed, old_ispeed);
> +
> + /* Check cfset*speed normalization */
> + CHECKZERO (cfsetospeed (&tio, speed));
> + CHECKZERO (tcsetattr (fd, TCSANOW, &tio));
> + check_speeds_tc (HERE, fd, speed, old_ispeed);
> + CHECKZERO (cfsetispeed (&tio, speed));
> + CHECKZERO (tcsetattr (fd, TCSANOW, &tio));
> + check_speeds_tc (HERE, fd, speed, speed);
> + CHECKZERO (cfsetospeed (&tio, old_ospeed));
> + CHECKZERO (tcsetattr (fd, TCSANOW, &tio));
> + check_speeds_tc (HERE, fd, old_ospeed, speed);
> + CHECKZERO (cfsetispeed (&tio, B0));
> + CHECKZERO (tcsetattr (fd, TCSANOW, &tio));
> + check_speeds_tc (HERE, fd, old_ospeed, B0);
> + CHECKZERO (cfsetspeed (&tio, speed));
> + CHECKZERO (tcsetattr (fd, TCSANOW, &tio));
> + check_speeds_tc (HERE, fd, speed, speed);
> + CHECKZERO (cfsetospeed (&tio, old_ospeed));
> + CHECKZERO (cfsetispeed (&tio, old_ispeed));
> + CHECKZERO (tcsetattr (fd, TCSANOW, &tio));
> + check_speeds_tc (HERE, fd, old_ospeed, old_ispeed);
> +}
> +
> +/* New interface cfset*baud test */
> +static void
> +new_cfbaud_test (int fd, baud_t baud)
> +{
> + struct termios tio;
> + baud_t old_obaud, old_ibaud;
> +
> + CHECKZERO (tcgetattr (fd, &tio));
> + old_obaud = CHECKERR (cfgetobaud (&tio));
> + old_ibaud = CHECKERR (cfgetibaud (&tio));
> +
> + /* Check initial normalization */
> + check_bauds_cf (HERE, &tio, old_obaud, old_ibaud);
> +
> + /* Check cfset*baud normalization */
> + CHECKZERO (cfsetobaud (&tio, baud));
> + check_bauds_cf (HERE, &tio, baud, old_ibaud);
> + CHECKZERO (cfsetibaud (&tio, baud));
> + check_bauds_cf (HERE, &tio, baud, baud);
> + CHECKZERO (cfsetobaud (&tio, old_obaud));
> + check_bauds_cf (HERE, &tio, old_obaud, baud);
> + CHECKZERO (cfsetibaud (&tio, B0));
> + check_bauds_cf (HERE, &tio, old_obaud, B0);
> + CHECKZERO (cfsetbaud (&tio, baud));
> + check_bauds_cf (HERE, &tio, baud, baud);
> + CHECKZERO (cfsetobaud (&tio, old_obaud));
> + CHECKZERO (cfsetibaud (&tio, old_ibaud));
> + check_bauds_cf (HERE, &tio, old_obaud, old_ibaud);
> +}
> +
> +/* New interface cfset*baud test with tcsetattr */
> +static void
> +new_tcbaud_test (int fd, baud_t baud)
> +{
> + struct termios tio;
> + baud_t old_obaud, old_ibaud;
> +
> + CHECKZERO (tcgetattr (fd, &tio));
> + old_obaud = CHECKERR (cfgetobaud (&tio));
> + old_ibaud = CHECKERR (cfgetibaud (&tio));
> +
> + /* Check initial normalization */
> + check_bauds_cf (HERE, &tio, old_obaud, old_ibaud);
> +
> + /* Check cfset*baud normalization */
> + CHECKZERO (cfsetobaud (&tio, baud));
> + CHECKZERO (tcsetattr (fd, TCSANOW, &tio));
> + check_bauds_tc (HERE, fd, baud, old_ibaud);
> + CHECKZERO (cfsetibaud (&tio, baud));
> + CHECKZERO (tcsetattr (fd, TCSANOW, &tio));
> + check_bauds_tc (HERE, fd, baud, baud);
> + CHECKZERO (cfsetobaud (&tio, old_obaud));
> + CHECKZERO (tcsetattr (fd, TCSANOW, &tio));
> + check_bauds_tc (HERE, fd, old_obaud, baud);
> + CHECKZERO (cfsetibaud (&tio, B0));
> + CHECKZERO (tcsetattr (fd, TCSANOW, &tio));
> + check_bauds_tc (HERE, fd, old_obaud, B0);
> + CHECKZERO (cfsetbaud (&tio, baud));
> + CHECKZERO (tcsetattr (fd, TCSANOW, &tio));
> + check_bauds_tc (HERE, fd, baud, baud);
> + CHECKZERO (cfsetobaud (&tio, old_obaud));
> + CHECKZERO (cfsetibaud (&tio, old_ibaud));
> + CHECKZERO (tcsetattr (fd, TCSANOW, &tio));
> + check_bauds_tc (HERE, fd, old_obaud, old_ibaud);
> +}
> +
> +/*
> + * Old interface tests. This depends critically on the new struct
> + * termios being guaranteed to be a superset of the legacy struct
> + * termios.
> + */
> +#if TEST_COMPAT (libc, GLIBC_2_0, GLIBC_2_42)
> +extern int __old_cfsetospeed (struct termios *tio_p, speed_t speed);
> +compat_symbol_reference (libc, __old_cfsetospeed, cfsetospeed, GLIBC_2_0);
> +extern int __old_cfsetispeed (struct termios *tio_p, speed_t speed);
> +compat_symbol_reference (libc, __old_cfsetispeed, cfsetispeed, GLIBC_2_0);
> +extern speed_t __old_cfgetospeed (const struct termios *tio_p);
> +compat_symbol_reference (libc, __old_cfgetospeed, cfgetospeed, GLIBC_2_0);
> +extern speed_t __old_cfgetispeed (const struct termios *tio_p);
> +compat_symbol_reference (libc, __old_cfgetispeed, cfgetispeed, GLIBC_2_0);
> +extern int __old_tcsetattr (int fd, int act, const struct termios *tio_p);
> +compat_symbol_reference (libc, __old_tcsetattr, tcsetattr, GLIBC_2_0);
> +extern int __old_tcgetattr (int fd, struct termios *tio_p);
> +compat_symbol_reference (libc, __old_tcgetattr, tcgetattr, GLIBC_2_0);
> +
> +static int old_tcsetattr (int fd, const struct termios *tio_p)
> +{
> + struct termios old_tio = *tio_p;
> +
> + /* Deliberately corrupt c_ispeed and c_ospeed */
> + old_tio.c_ispeed = 0xdeadbeef;
> + old_tio.c_ospeed = 0xfeedface;
> + return __old_tcsetattr (fd, TCSANOW, &old_tio);
> +}
> +static int old_tcgetattr (int fd, struct termios *tio_p)
> +{
> + int rv;
> + memset (tio_p, 0xde, sizeof *tio_p);
> + rv = __old_tcgetattr (fd, tio_p);
> + if (rv)
> + return rv;
> +
> + /* Deliberately corrupt c_ispeed and c_ospeed */
> + tio_p->c_ispeed = 0xdeadbeef;
> + tio_p->c_ospeed = 0xfeedface;
> + return 0;
> +}
> +
> +/* Old interface test. This relies on the new struct termios always
> + being a binary superset of the old one.
> + This doesn't bother testing split speed, since that never worked
> + on the old glibc. */
> +static void
> +old_tcspeed_test (int fd, speed_t speed)
> +{
> + struct termios tio;
> + speed_t cbaud;
> +
> + if (!speed)
> + return; /* Skip B0 for this test */
> +
> + cbaud = speed_to_cbaud (speed);
> + if (cbaud == __BOTHER)
> + return;
> +
> + CHECKZERO (old_tcgetattr (fd, &tio));
> + CHECKZERO (__old_cfsetospeed (&tio, cbaud));
> + VERIFY (__old_cfgetospeed (&tio),==,cbaud);
> + CHECKZERO (__old_cfsetispeed (&tio, cbaud));
> + VERIFY (__old_cfgetispeed (&tio),==,cbaud);
> + CHECKZERO (old_tcsetattr (fd, &tio));
> + check_speeds_tc (HERE, fd, speed, speed);
> +}
> +
> +/* Verify that invalid CBAUD values return error for the old interfaces */
> +static void
> +old_invalid_speeds_test (int fd)
> +{
> + struct termios tio;
> + speed_t cbaud;
> +
> + for (cbaud = 0 ; cbaud ; cbaud > 0xffff ? (cbaud <<= 1) : cbaud++) {
> + speed_t realspeed;
> + realspeed = (cbaud & ~CBAUD) ? BOGUS : cbaud_to_speed (cbaud);
> + if (realspeed >= ANY)
> + {
> + int rv;
> +
> + errno = 0;
> + rv = __old_cfsetospeed (&tio, cbaud);
> + if (rv != -1 || errno != EINVAL)
> + {
> + ERROR(HERE, "__old_cfsetospeed() accepted invalid value %06o",
> + cbaud);
> + }
> +
> + errno = 0;
> + rv = __old_cfsetispeed (&tio, cbaud);
> + if (rv != -1 || errno != EINVAL)
> + {
> + ERROR(HERE, "__old_cfsetispeed() accepted invalid value %06o",
> + cbaud);
> + }
> + }
> + else
> + {
> + CHECKZERO (__old_cfsetospeed (&tio, cbaud));
> + VERIFY (__old_cfgetospeed (&tio),==,cbaud);
> + CHECKZERO (__old_cfsetispeed (&tio, cbaud));
> + VERIFY (__old_cfgetispeed (&tio),==,cbaud);
> + if (cbaud)
> + {
> + CHECKZERO (old_tcsetattr (fd, &tio));
> + check_speeds_tc (HERE, fd, realspeed, realspeed);
> + }
> + }
> + }
> +}
> +
> +static void
> +compat_tests (int fd)
> +{
> + run_speed_test (fd, old_tcspeed_test);
> + old_invalid_speeds_test (fd);
> +}
> +#else /* No TEST_COMPAT */
> +#define compat_tests(fd) ((void)(fd))
> +#endif
> +
> +static void
> +run_speed_test (int fd, speed_test_t test)
> +{
> + unsigned short seed [3] = { 0x1234, 0x5678, 0x9abc };
> + struct speeds {
> + speed_t ospeed, ispeed;
> + };
> + static const struct speeds initial_speeds [] = {
> + { 2400, 2400 }, /* Standard speed, non-split */
> + { 123456, 123456 }, /* Nonstandard speed, non-split */
> + { 75, 1200 }, /* Standard split speeds */
> + { 9600, 456789 }, /* One standard, one nonstandard */
> + { 54321, 1234567890 }, /* Nonstandard, one very high */
> + { 0, 0 }
> + };
> +
> + for (const struct speeds *is = initial_speeds ; is->ospeed ; is++)
> + {
> + /* Set up initial conditions */
> + set_speeds (fd, is->ospeed, is->ispeed);
> +
> + /* Test all common speeds */
> + for (int i = 0 ; i < NUM_TEST_SPEEDS ; i++)
> + {
> + test (fd, test_speeds[i]);
> + }
> +
> + /* Test pseudorandom speeds; NUM_TEST_SPEEDS here is arbitrary */
> + for (int i = 0 ; i < NUM_TEST_SPEEDS ; i++)
> + {
> + test (fd, (speed_t) jrand48 (seed));
> + }
> +
> + /* Test power-of-2 speeds */
> + for (speed_t s = 1 ; s ; s <<= 1)
> + {
> + test (fd, s);
> + }
> +
> + /* Test power of 2 multiples of 300;
> + 300 << 23 is the maximum below 2^32 */
> + for (int i = 0 ; i < 24 ; i++)
> + {
> + test (fd, B300 << i);
> + }
> + }
> +}
> +
> +static void
> +run_speed_tests (int fd)
> +{
> + /* Test proper canonicalization using the new interface */
> + run_speed_test (fd, new_cfspeed_test);
> + run_speed_test (fd, new_tcspeed_test);
> +
> + /* Try the new cfset*baud() functions */
> + run_speed_test (fd, new_cfbaud_test);
> + run_speed_test (fd, new_tcbaud_test);
> +
> + /* Tests of the legacy functions */
> + compat_tests (fd);
> +}
> +
> +/* chroot setup */
> +
> +static char *chrootdir;
> +
> +static void
> +prepare (int argc, char **argv)
> +{
> + chrootdir = xasprintf ("%s/tst-termios-XXXXXX", test_dir);
> + if (mkdtemp (chrootdir) == NULL)
> + FAIL_EXIT1 ("mkdtemp (\"%s\"): %m", chrootdir);
> + add_temp_file (chrootdir);
> +}
> +#define PREPARE prepare
> +
> +/* test dispatch */
> +
> +static void
> +run_in_chroot (void)
> +{
> + /* Create a pty slave to use as a tty. Most of the termios settings,
> + including the speeds, have no impact on a pty, but they are still
> + settable like for any other tty, which makes them very convenient
> + for testing. */
> + int ptmfd, ttyfd;
> +
> + ptmfd = posix_openpt (O_RDWR|O_NOCTTY|O_NONBLOCK);
> + if (ptmfd < 0 || grantpt (ptmfd) || unlockpt (ptmfd))
> + {
> + FAIL_UNSUPPORTED ("cannot create PTY in chroot: %m"
> + " (consider increasing limits?)");
> + }
> +
> + ttyfd = ioctl (ptmfd, TIOCGPTPEER, O_RDWR|O_NOCTTY|O_NONBLOCK);
> + if (ttyfd < 0 || !isatty (ttyfd))
> + {
> + FAIL_UNSUPPORTED ("failed to open PTY slave in chroot: %m");
> + }
> +
> + run_speed_tests (ttyfd);
> +
> + close (ttyfd);
> + close (ptmfd);
> +}
> +
> +static int
> +do_test (void)
> +{
> + errors = 0;
> +
> + support_become_root ();
> + run_in_chroot ();
> +
> + if (errors)
> + {
> + printf ("%s: %u error%s\n", __FILE__, errors, errors != 1 ? "s" : "");
> + return 1;
> + }
> +
> + return 0;
> +}
> +
> +#include <support/test-driver.c>
> diff --git a/sysdeps/unix/sysv/linux/tst-termios-speed-tables.c b/sysdeps/unix/sysv/linux/tst-termios-speed-tables.c
> new file mode 100644
> index 000000000000..885266d09a39
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/tst-termios-speed-tables.c
> @@ -0,0 +1,86 @@
> +/* Table of legacy speed constants */
> +
> +struct cbaud_table
> +{
> + speed_t speed;
> + speed_t cbaud;
> + const char *name;
> +};
> +
> +static const struct cbaud_table cbaud_table [] =
> +{
> + { 0, __B0, "__B0" },
> + { 50, __B50, "__B50" },
> + { 75, __B75, "__B75" },
> + { 110, __B110, "__B110" },
> + { 134, __B134, "__B134" },
> + { 150, __B150, "__B150" },
> + { 200, __B200, "__B200" },
> + { 300, __B300, "__B300" },
> + { 600, __B600, "__B600" },
> + { 1200, __B1200, "__B1200" },
> + { 1800, __B1800, "__B1800" },
> + { 2400, __B2400, "__B2400" },
> + { 4800, __B4800, "__B4800" },
> +#ifdef __B7200
> + { 7200, __B7200, "__B7200" },
> +#endif
> + { 9600, __B9600, "__B9600" },
> +#ifdef __B14400
> + { 14400, __B14400, "__B14400" },
> +#endif
> + { 19200, __B19200, "__B19200" },
> +#ifdef __B28800
> + { 28800, __B28800, "__B28800" },
> +#endif
> + { 38400, __B38400, "__B38400" },
> + { 57600, __B57600, "__B57600" },
> +#ifdef __B76800
> + { 76800, __B76800, "__B76800" },
> +#endif
> + { 115200, __B115200, "__B115200" },
> +#ifdef __B153600
> + { 153600, __B153600, "__B153600" },
> +#endif
> + { 230400, __B230400, "__B230400" },
> +#ifdef __B307200
> + { 307200, __B307200, "__B307200" },
> +#endif
> + { 460800, __B460800, "__B460800" },
> + { 500000, __B500000, "__B500000" },
> + { 576000, __B576000, "__B576000" },
> +#ifdef __B614400
> + { 614400, __B614400, "__B614400" },
> +#endif
> + { 921600, __B921600, "__B921600" },
> + { 1000000, __B1000000, "__B1000000" },
> + { 1152000, __B1152000, "__B1152000" },
> + { 1500000, __B1500000, "__B1500000" },
> + { 2000000, __B2000000, "__B2000000" },
> +#ifdef __B2500000
> + { 2500000, __B2500000, "__B2500000" },
> +#endif
> +#ifdef __B3000000
> + { 3000000, __B3000000, "__B3000000" },
> +#endif
> +#ifdef __B3500000
> + { 3500000, __B3500000, "__B3500000" },
> +#endif
> +#ifdef __B4000000
> + { 4000000, __B4000000, "__B4000000" },
> +#endif
> + { ANY, __BOTHER, "__BOTHER" },
> + { BOGUS, BOGUS, "invalid" }
> +};
> +
> +/* List of common speeds to test */
> +
> +#define NUM_TEST_SPEEDS 41
> +static const speed_t test_speeds [NUM_TEST_SPEEDS] =
> +{
> + 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400,
> + 4800, 7200, 9600, 14400, 19200, 28800, 33600, 38400, 57600,
> + 76800, 115200, 153600, 230400, 307200, 460800, 500000,
> + 576000, 614400, 921600, 1000000, 1152000, 1500000, 2000000,
> + 2500000, 3000000, 3500000, 4000000, 5000000, 10000000
> +};
More information about the Libc-alpha
mailing list