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author | Lukasz Majewski <lukma@denx.de> | 2020-02-10 10:55:24 +0100 |
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committer | Lukasz Majewski <lukma@denx.de> | 2020-04-06 23:05:11 +0200 |
commit | 6f5eb5b2e57c507b17e3ba8c76433109d276a148 (patch) | |
tree | 8e03750f289f98e599cf0cde205a2bfdae786c3f /sysdeps | |
parent | 390b5a4727924503095327087c5d5f7a369732ef (diff) | |
download | glibc-6f5eb5b2e57c507b17e3ba8c76433109d276a148.zip glibc-6f5eb5b2e57c507b17e3ba8c76433109d276a148.tar.gz glibc-6f5eb5b2e57c507b17e3ba8c76433109d276a148.tar.bz2 |
y2038: linux: Provide __mq_timedsend_time64 implementation
This patch provides new __mq_timedsend_time64 explicit 64 bit function for
sending messages with absolute timeout.
Moreover, a 32 bit version - __mq_timedsend has been refactored to internally
use __mq_timedsend_time64.
The __mq_timedsend is now supposed to be used on systems still supporting 32
bit time (__TIMESIZE != 64) - hence the necessary conversion to 64 bit struct
__timespec64 from struct timespec.
The new __mq_timedsend_time64 syscall available from Linux 5.1+ has been used,
when applicable.
As this wrapper function is also used internally in the glibc, to e.g. provide
mq_send implementation, an explicit check for abs_timeout being NULL has been
added due to conversions between struct timespec and struct __timespec64.
Before this change the Linux kernel handled this NULL pointer.
Build tests:
- ./src/scripts/build-many-glibcs.py glibcs
Run-time tests:
- Run specific tests on ARM/x86 32bit systems (qemu):
https://github.com/lmajewski/meta-y2038 and run tests:
https://github.com/lmajewski/y2038-tests/commits/master
Linux kernel, headers and minimal kernel version for glibc build test matrix:
- Linux v5.1 (with mq_timedsend_time64) and glibc built with v5.1 as a
minimal kernel version (--enable-kernel="5.1.0")
The __ASSUME_TIME64_SYSCALLS flag defined.
- Linux v5.1 and default minimal kernel version
The __ASSUME_TIME64_SYSCALLS not defined, but kernel supports
mq_timedsend_time64 syscall.
- Linux v4.19 (no mq_timedsend_time64 support) with default minimal kernel
version for contemporary glibc (3.2.0)
This kernel doesn't support mq_timedsend_time64 syscall, so the fallback to
mq_timedsend is tested.
Above tests were performed with Y2038 redirection applied as well as without
(so the __TIMESIZE != 64 execution path is checked as well).
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Diffstat (limited to 'sysdeps')
-rw-r--r-- | sysdeps/unix/sysv/linux/mq_timedsend.c | 49 |
1 files changed, 46 insertions, 3 deletions
diff --git a/sysdeps/unix/sysv/linux/mq_timedsend.c b/sysdeps/unix/sysv/linux/mq_timedsend.c index 888ec67..f2a43df 100644 --- a/sysdeps/unix/sysv/linux/mq_timedsend.c +++ b/sysdeps/unix/sysv/linux/mq_timedsend.c @@ -22,12 +22,55 @@ /* Add message pointed by MSG_PTR to message queue MQDES, stop blocking on full message queue if ABS_TIMEOUT expires. */ int -__mq_timedsend (mqd_t mqdes, const char *msg_ptr, size_t msg_len, - unsigned int msg_prio, const struct timespec *abs_timeout) +__mq_timedsend_time64 (mqd_t mqdes, const char *msg_ptr, size_t msg_len, + unsigned int msg_prio, + const struct __timespec64 *abs_timeout) { +#ifdef __ASSUME_TIME64_SYSCALLS +# ifndef __NR_mq_timedsend_time64 +# define __NR_mq_timedsend_time64 __NR_mq_timedsend +# endif + return SYSCALL_CANCEL (mq_timedsend_time64, mqdes, msg_ptr, msg_len, + msg_prio, abs_timeout); +#else + int ret = SYSCALL_CANCEL (mq_timedsend_time64, mqdes, msg_ptr, msg_len, + msg_prio, abs_timeout); + if (ret == 0 || errno != ENOSYS) + return ret; + + struct timespec ts32; + if (abs_timeout != NULL) + { + if (! in_time_t_range (abs_timeout->tv_sec)) + { + __set_errno (EOVERFLOW); + return -1; + } + + ts32 = valid_timespec64_to_timespec (*abs_timeout); + } + return SYSCALL_CANCEL (mq_timedsend, mqdes, msg_ptr, msg_len, msg_prio, - abs_timeout); + abs_timeout != NULL ? &ts32 : NULL); +#endif +} + +#if __TIMESIZE != 64 +librt_hidden_def (__mq_timedsend_time64) + +int +__mq_timedsend (mqd_t mqdes, const char *msg_ptr, size_t msg_len, + unsigned int msg_prio, const struct timespec *abs_timeout) +{ + struct __timespec64 ts64; + if (abs_timeout != NULL) + ts64 = valid_timespec_to_timespec64 (*abs_timeout); + + return __mq_timedsend_time64 (mqdes, msg_ptr, msg_len, msg_prio, + abs_timeout != NULL ? &ts64 : NULL); } +#endif + hidden_def (__mq_timedsend) weak_alias (__mq_timedsend, mq_timedsend) hidden_weak (mq_timedsend) |