Gregory Nutt has submitted the SGA
Haltian Ltd has submitted the SGA
as a result we can migrate the licenses to Apache.
Signed-off-by: Alin Jerpelea <alin.jerpelea@sony.com>
This fixes busylooping in work_usrthread, due to incorrect time spec given to sem_timedwait
_SEM_TIMEDWAIT works on absolute time stamps, using CLOCK_REALTIME
Signed-off-by: Jukka Laitinen <jukkax@ssrc.tii.ae>
aio/lio_listio.c:227:7: warning: implicit declaration of function ‘ferr’ [-Wimplicit-function-declaration]
227 | ferr("ERROR: lib_zalloc failed\n");
| ^~~~
aio/lio_listio.c:275:3: warning: implicit declaration of function ‘finfo’ [-Wimplicit-function-declaration]
275 | finfo("Registering signal handler\n");
aio/aio_read.c: In function ‘aio_read_worker’:
aio/aio_read.c:90:11: warning: implicit declaration of function ‘file_pread’; did you mean ‘aio_read’? [-Wimplicit-function-declaration]
90 | nread = file_pread(aioc->aioc_filep, (FAR void *)aiocbp->aio_buf,
| ^~~~~~~~~~
| aio_read
aio/aio_write.c: In function ‘aio_write_worker’:
aio/aio_write.c:85:12: warning: implicit declaration of function ‘file_fcntl’ [-Wimplicit-function-declaration]
85 | oflags = file_fcntl(aioc->aioc_filep, F_GETFL);
| ^~~~~~~~~~
CC: mmap/fs_mmap.c
CC: pthread/pthread_condclockwait.c
aio/aio_write.c:107:18: warning: implicit declaration of function ‘file_write’; did you mean ‘aio_write’? [-Wimplicit-function-declaration]
107 | nwritten = file_write(aioc->aioc_filep,
| ^~~~~~~~~~
| aio_write
aio/aio_write.c:113:18: warning: implicit declaration of function ‘file_pwrite’; did you mean ‘aio_write’? [-Wimplicit-function-declaration]
113 | nwritten = file_pwrite(aioc->aioc_filep,
| ^~~~~~~~~~~
| aio_write
In file included from aio/aio_write.c:34:
aio/aio_write.c:121:12: warning: format ‘%d’ expects argument of type ‘int’, but argument 3 has type ‘ssize_t’ {aka ‘long int’} [-Wformat=]
121 | ferr("ERROR: write/pwrite/send failed: %d\n", nwritten);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~
| |
| ssize_t {aka long int}
aio/aio_write.c:121:47: note: format string is defined here
121 | ferr("ERROR: write/pwrite/send failed: %d\n", nwritten);
| ~^
| |
| int
| %ld
Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
This reverts commit 3724f6be55.
Because there is no real correlation between DNS namesize and NAME_MAX
as far as I know. The former is about network and the latter is about
filesystem. While they might happen to be similar values for
some configurations, it's very confusing to use them this way.
Gregory Nutt has submitted the SGA
Omni Hoverboards has submitted the SGA
Paul Alexander Patience has submitted the ICLA
as a result we can migrate the licenses to Apache.
Signed-off-by: Alin Jerpelea <alin.jerpelea@sony.com>
It is okay for the application to be built without RTTI (-fno-rrti), but
libcxxabi requires RTTI at least for the library.
Signed-off-by: Gustavo Henrique Nihei <gustavo.nihei@espressif.com>
NUTTX_LIBCXX is only basic C++ support, do not support many c++
library function, NUTTX_NOCXXLIB is more suitable.
When NUTTX_NOCXXLIB is select, do not select lower level support.
Change-Id: I158937a4ba02f8fa3c76101acbdfb295d8cd736f
and implement all status related change function. the individual
file system change will provide in other upcoming patchset.
Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
Change-Id: I8fde9db8eba9586e9c8da078b67e020c26623cf4
The libcxx-X.Y.Z.src.tar.xz contains a symbolic link to a directory
that not exist as below.
`libcxx-X.Y.Z.src/test/std/pstl -> ../../../pstl/test/std`
Linux and macOS environment have no problem, but it causes an error
when extracting tarball on Windows platform. This symbolic link is not
actually used, so exclude it from extracting the tarball.
include/nuttx/wqueue.h:
libs/libc/wqueue/work_cancel.c:
libs/libc/wqueue/work_queue.c:
sched/wqueue/kwork_cancel.c:
sched/wqueue/kwork_queue.c:
* Fix spelling, grammar, and typos.
* Improve wording in a few areas.
* These changes affect comments only. No functional changes.
since it's useful to redirect these functions to others
sometime(e.g. validate the memory before write).
Change-Id: I6253a9231af8809e8362f4bc5a1bd67fb094c3b0
MIRTOS-107
Add _SC_MONOTONIC_CLOCK to sysconf when CONFIG_CLOCK_MONOTONIC is set
Change-Id: I0ae57798ebe89247a10ccb517e128866d1f907de
Signed-off-by: Peter Bee <bijunda1@xiaomi.com>
Fix a problem where the log function would loop infinitely by
calculation error when a specific value was passed. For example,
in the following case, the log function loops infinitely and
never returns. So, this commit fixes to return the right value.
double a = 7883961.5;
double b = log(a);
Note: this patch can get file path from root pseudo file handle,
but a general infrastructure is setup for other file system too.
Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
Change-Id: I86cd79ebb741f2f43fdd398bb7498c40687d949b
This commit fixes a compile error caused by the following commit.
fe9ccff libs: libnx: nxfonts: fix Mixed case identifier
Change the prefix of generated font data to lower case.
since the leap correction is always four bytes in timezone file
Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
Change-Id: I2d72f5eaf37f0c86d95eaf7504a1b8b1469bf06a
since the similar functions(e.g. strdup/strndup) put into libs/libc/string
Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
Change-Id: Ifb2c0c51298b09014748e5ee8275db51213d6911
since the unwinder not only work with arm but also other arch(e.g. riscv)
Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
Change-Id: I56cc54f2c99560c858362ab2dfba524097385716
from https://pubs.opengroup.org/onlinepubs/007904875/functions/setpriority.html:
1.The nice value shall in the range [-{NZERO},{NZERO} -1]
2.Lower nice value shall cause more favorable scheduling
Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
Change-Id: I5ad60d92abc3b69fbaa406da68cec2e40ca3fa6d
I not two problems in handling of the return error values in PR #3858:
1. In KERNEL mode, the error return value of _SEM_WAIT() will be a negated errno value; in all other modes, it will be -1 (ERROR) with the errno variable set. This must be handled in the test of the returned value: Don't compare with -1; rather check if < 0
2. Also, conversion of the returned value to a negated errno value must be handled differently. This is handled by replacing -get_errno() with the macro _ERRVAL(ret)
This effects only error handling (it fixes it) and no other impacts are expected.
It's better to save one argument by returning pid directly.
This change also follow the convention of task_create.
BTW, it is reasonable to adjust the function prototype a
little bit from both implementation and consistency since
task_spawn is NuttX specific API.
Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
OS functions in syscall.csv are ordered alphabetically. However, two recently added functions are not in the correct location. This PR simply corrects that ordering.
The ordering of one entry was also corrected in libs/libc/libc.csv. Same issue.
This change is only cosmetic.
Verified only by CI
Gregory Nutt is the copyright holder for those files and he has submitted the
SGA as a result we can migrate the licenses to Apache.
Signed-off-by: Alin Jerpelea <alin.jerpelea@sony.com>
Gregory Nutt is the copyright holder for those files and he has submitted the
SGA as a result we can migrate the licenses to Apache.
Signed-off-by: Alin Jerpelea <alin.jerpelea@sony.com>
Drop to user-space in kernel/protected build with up_pthread_exit,
now all pthread_cleanup functions executed in user mode.
* A new syscall SYS_pthread_exit added
* A new tcb flag TCB_FLAG_CANCEL_DOING added
* up_pthread_exit implemented for riscv/arm arch
Signed-off-by: Huang Qi <huangqi3@xiaomi.com>
Pros:
* Reduce code differences
* Smaller allocations for !CONFIG_ARCH_USE_MODULE_TEXT
Cons:
* Likely to use more memory for !CONFIG_ARCH_USE_MODULE_TEXT in total
Tested with:
* sim:module on macOS
* esp32-devkit:nsh + CONFIG_MODULE on qemu
* lm3s6965-ek:qemu-protected + CONFIG_EXAMPLES_SOTEST on qemu
arch: Allocate the space from the beginning in up_stack_frame
and modify the affected portion:
1.Correct the stack dump and check
2.Allocate tls_info_s by up_stack_frame too
3.Move the stack fork allocation from arch to sched
Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
I've seen a module with 16 bytes .rodata alignment for xmm operations.
It was getting SEGV on sim/Linux because of the alignment issue.
The same module binary seems working fine after applying this patch.
Also, tested on sim/macOS and esp32 on qemu,
using a module with an artificially large alignment. (64 bytes)
Fix comment in libs/libc/tls/tls_getinfo.c: The TLS data must lie at the beginning of the allocated stack memory for both push-up and push-down stacks.
Ken Pettit has submitted the ICLA and we can migrate the licenses
to Apache.
Sebastien Lorquet has submitted the ICLA and we can migrate the licenses
to Apache.
Gregory Nutt has submitted the SGA and we can migrate the licenses
to Apache.
Signed-off-by: Alin Jerpelea <alin.jerpelea@sony.com>
Or genromfs failed to generate the right romfs.img
Change-Id: Icbcc2e89da1ede644b994d33e70f1a48662c412b
Signed-off-by: liuhaitao <liuhaitao@xiaomi.com>
Per the Linux man page, "By default, getopt() permutes the contents of argv as it scans, so that eventually all the nonoptions are at the end." This behavior, however, is not implemented in the NuttX getopt() logic.
The Linux man page requires that the getopt_long() and getopt_long_only() functions accept arguments to options in a form like:
--option=argument
This PR adds that missing functionality.
This change effects only getopt_long() and getopt_long_only()
Tested on a simulator NSH configuration with a modified version of the getopt() test in apps/testing/ostest.
If an unrecognized long option is encountered, we must skip over that argv[] entry or getopt_long() will seriously misbehave.
Affects getopt_long() and getopt_long_only()
Problem found and fix verified with an updated version of the OS test.
Found a place in getopt_common() where the option string is used before it is checked if it is NULL. This can happen because the short option string is optional for getopt_long() and getopt_long_only()
If optstring is NULL, that would be an ERROR for getopt(), but not for the getopt_long() versions.
Should effect only the getopt() APIs
Tested on the simulator using apps/testing/ostest.
Several licenses were missed in the initial work
David Sidrane has submitted the ICLA and we can migrate the licenses
to Apache.
Gregory Nutt has submitted the SGA and we can migrate the licenses
to Apache.
Signed-off-by: Alin Jerpelea <alin.jerpelea@sony.com>
1. Null pointer dereference:
- for (ndx = 0; longopts[ndx].name[0] != '\0'; ndx++)
+ for (ndx = 0; longopts[ndx].name != NULL; ndx++)
2. Handle single character long options. An option like -x could be either a short option or a long option (under getopt_long_only()). This case was not being handled correctly.
3. Add missing support for optional arguments to short options (indicated with two "::"
This effects all members of the getopt() family of APIs.
Tested on the simulator using extensions to apps/testing/ostest.
Add implementations of getopt_long() and getopt_long_only()
There could be impacts to getop() since that implementation is shared withe new getopts_long() and getops_long_only() implementation.
Tested using a modified version of sim:nsh
Since 7a046358d9 the top-level COPYING
file has been deleted and replaced by DISCLAIMER, LICENSE, and NOTICE
files. However, some references to the old COPYING file remained in
Kconfig help text and documentation.
Documentation/contributing/coding_style.rst:
Documentation/introduction/about.rst:
boards/arm/lpc17xx_40xx/olimex-lpc1766stk/README.txt:
boards/arm/sam34/arduino-due/README.txt:
boards/arm/sam34/sam4l-xplained/README.txt:
boards/arm/sama5/giant-board/README.md:
boards/arm/sama5/sama5d2-xult/README.txt:
boards/arm/sama5/sama5d4-ek/README.txt:
boards/arm/samd2l2/samd20-xplained/README.txt:
boards/arm/samd2l2/samd21-xplained/README.txt:
boards/arm/samd2l2/saml21-xplained/README.txt:
boards/arm/stm32/hymini-stm32v/README.txt:
boards/arm/stm32/stm3210e-eval/README.txt:
fs/fat/Kconfig:
libs/libc/string/Kconfig:
* Updates stale references to the old top-level COPYING file to
either LICENSE or NOTICE (or both), as appropriate in each
instance.
Mark Schulte has submitted the ICLA and we can migrate the licenses
to Apache.
Gregory Nutt has submitted the SGA and we can migrate the licenses
to Apache.
Signed-off-by: Alin Jerpelea <alin.jerpelea@sony.com>
Pierre-Noel Bouteville has submitted the ICLA and we can migrate the licenses
to Apache.
David Sidrane has submitted the ICLA and we can migrate the licenses
to Apache.
Gregory Nutt has submitted the SGA and we can migrate the licenses
to Apache.
Signed-off-by: Alin Jerpelea <alin.jerpelea@sony.com>
Uros Platise has submitted the ICLA and we can migrate the licenses
to Apache.
David Sidrane has submitted the ICLA and we can migrate the licenses
to Apache.
Bob Feretich has submitted the ICLA and we can migrate the licenses
to Apache.
Gregory Nutt has submitted the SGA and we can migrate the licenses
to Apache.
Signed-off-by: Alin Jerpelea <alin.jerpelea@sony.com>
Johannes Schock has submitted the ICLA and we can migrate the licenses
to Apache.
Gregory Nutt has submitted the SGA and we can migrate the licenses
to Apache.
Signed-off-by: Alin Jerpelea <alin.jerpelea@sony.com>
getopt() in the FLAT build environment is not thread safe. This is because global variables that are process-specific in Unix are truly global in the FLAT build. Moving the getopt() variables into TLS resolves this issue.
No side-effects are expected other than to getopt()
Tested with sim:nsh
OpenGroup specification was updated regarding the return value for
pthread_once, which after Issue 7 states that "the [EINVAL] error for an
uninitialized pthread_once_t object is removed; this condition results
in undefined behavior".
Gregory Nutt has submitted the SGA and we can migrate the licenses
to Apache.
Several files were missed in the past
Signed-off-by: Alin Jerpelea <alin.jerpelea@sony.com>
David Sidrane has submitted the ICL and we can migrate the licenses
to Apache.
Gregory Nutt has submitted the SGA and we can migrate the licenses
to Apache.
Signed-off-by: Alin Jerpelea <alin.jerpelea@sony.com>
David S. Alessio has submitted the ICL and we can migrate the licenses
to Apache.
Gregory Nutt has submitted the SGA and we can migrate the licenses
to Apache.
Signed-off-by: Alin Jerpelea <alin.jerpelea@sony.com>
Stream buffer flags has a dependency with allocated buffer,
and it cannot clear without buffer operation.
Change clearerr to keep buffer flags to prevent unexpected
buffer operation.
When CONFIG_SYMTAB_ORDEREDBYNAME is selected most code will use
the ordered search function. When it is not selected no code will
use the ordered search function. This change merges the two
functions and varies its behaviour based on the config setting,
such that all callers can simply call the one search function
and get the best behaviour.
An additional configuration option allows leading underscores to
be stripped from symbols being relocated in loaded objects. This
allows toolchains which prefix C symbol with underscores to make
loadable ELF objects.
Implement si_send/sendto/recvfrom with si_sendmsg/recvmsg, instead of
the other way round.
Change-Id: I7b858556996e0862df22807a6edf6d7cfe6518fc
Signed-off-by: Peter Bee <bijunda1@xiaomi.com>
Change the copyright header of assorted source files in libs/libc to the
ASF version. I was listed as the author in these files. I did also
check the heritage of those files and besides me they have only been
changed by the following people, all of whom did sign a CLA to the best
of my knowledge:
Alin Jerpelea
Haitao Liu
Gregory Nutt
Yamamoto Takashi
Xiang Xiao
Signed-off-by: Michael Jung <mijung@gmx.net>
Summary:
- The code was added in Mar 2018 to stabilize the SMP kernel
- I confirmed that the code is no longer needed now.
Impact:
- SMP only
Testing:
- Tested with ostest the following configs
- esp32-devkitc:smp (QEMU), sabre-6quad:smp (QEMU)
- maix-bit:smp (QEMU), sim:smp
- spresense:smp
- Tested with nxplayer and stress test with spresense:wifi_smp
Signed-off-by: Masayuki Ishikawa <Masayuki.Ishikawa@jp.sony.com>
ld error caused by multiple definition:
ld: arm-none-eabi/lib/thumb/v8-m.main+fp/hard/libsupc++.a(atexit_arm.o): in function `__aeabi_atexit':
atexit_arm.cc:(.text.__aeabi_atexit+0x0): multiple definition of `__aeabi_atexit';
nuttx/staging/libxx.a(libxx_eabi_atexit.o):nuttx/libs/libxx/libxx_eabi_atexit.cxx:75: first defined here
Signed-off-by: chao.an <anchao@xiaomi.com>
Summary:
- This commit fixes compile errors in libxx_new.cxx and libxx_newa.cxx
Impact:
- None
Testing:
- Build with spresense:nsh with CONFIG_DEBUG_ERROR=y
Signed-off-by: Masayuki Ishikawa <Masayuki.Ishikawa@jp.sony.com>
all the characters placed before the space on the ASCII table
and the 0x7F character (DEL) are control characters.
Signed-off-by: chao.an <anchao@xiaomi.com>
This might be specific to gcc or Linux
as I didn't see it with clang + macOS.
libcxx/src/locale.cpp: In member function 'void std::__1::locale::__install_ctor(const std::__1::locale&, std::__1::locale::facet*, long int)':
libcxx/src/locale.cpp:576:62: warning: declaration of 'id' shadows a member of 'std::__1::locale' [-Wshadow]
576 | locale::__install_ctor(const locale& other, facet* f, long id)
| ^
In file included from /Users/yamamoto/git/nuttx/nuttx/include/libcxx/locale:181,
from libcxx/src/locale.cpp:16:
/Users/yamamoto/git/nuttx/nuttx/include/libcxx/__locale:203:32: note: shadowed declaration is here
203 | class _LIBCPP_TYPE_VIS locale::id
| ^~
This might be specific to gcc or Linux
as I didn't see it with clang + macOS.
libcxx/src/barrier.cpp: In constructor 'std::__1::__barrier_algorithm_base::__barrier_algorithm_base(ptrdiff_t&)':
libcxx/src/barrier.cpp:35:9: warning: declaration of '__expected' shadows a member of 'std::__1::__barrier_algorithm_base' [-Wshadow]
35 | : __expected(__expected)
| ^
libcxx/src/barrier.cpp:29:24: note: shadowed declaration is here
29 | ptrdiff_t& __expected;
| ^~~~~~~~~~
libcxx/src/barrier.cpp: In constructor 'std::__1::__barrier_algorithm_base::__barrier_algorithm_base(ptrdiff_t&)':
libcxx/src/barrier.cpp:44:5: warning: declaration of '__expected' shadows a member of 'std::__1::__barrier_algorithm_base' [-Wshadow]
44 | }
| ^
libcxx/src/barrier.cpp:29:24: note: shadowed declaration is here
29 | ptrdiff_t& __expected;
| ^~~~~~~~~~
libcxx/src/barrier.cpp: In constructor 'std::__1::__barrier_algorithm_base::__barrier_algorithm_base(ptrdiff_t&)':
libcxx/src/barrier.cpp:44:5: warning: declaration of '__expected' shadows a member of 'std::__1::__barrier_algorithm_base' [-Wshadow]
44 | }
| ^
libcxx/src/barrier.cpp:29:24: note: shadowed declaration is here
29 | ptrdiff_t& __expected;
| ^~~~~~~~~~
CXX: libcxx/src/new.cpp
In file included from libcxx/src/new.cpp:19:
/usr/include/c++/9/cxxabi.h: In member function 'virtual bool __cxxabiv1::__pbase_type_info::__pointer_catch(const __cxxabiv1::__pbase_type_info*, void**, unsigned int) const':
/usr/include/c++/9/cxxabi.h:308:23: error: 'const class std::type_info' has no member named '__do_catch'
308 | return __pointee->__do_catch (thrown_type->__pointee, thr_obj, outer + 2);
| ^~~~~~~~~~
The length of hostbuffer come from Kconfig, it isn't safe to
allocate this variable on the stack.
Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
Change-Id: I75213688153a1cba738544de2a51fa3247626dd3
wget is missing from some system (like macOS and Windows native),
it's better to use curl to simplify build environment.
Signed-off-by: Huang Qi <huangqi3@xiaomi.com>
The following errors are intentionally left.
They are a part of tables which are not trivial to fix.
libs/libc/machine/arm/armv6-m/arch_elf.c:228:94: error: Long line found
libs/libc/machine/arm/armv6-m/arch_elf.c:230:89: error: Long line found
libs/libc/machine/arm/armv6-m/arch_elf.c:238:94: error: Long line found
libs/libc/machine/arm/armv6-m/arch_elf.c:240:89: error: Long line found
libs/libc/machine/arm/armv6-m/arch_elf.c:401:94: error: Long line found
libs/libc/machine/arm/armv6-m/arch_elf.c:403:91: error: Long line found
libs/libc/machine/arm/armv6-m/arch_elf.c:411:94: error: Long line found
libs/libc/machine/arm/armv6-m/arch_elf.c:413:91: error: Long line found
For commands without "-" arguments, ex:"ls", we should always let
optind = 1 after getopt is called in order to get what follows
correctly.
Change-Id: Iac3cfbadd27fb96e47070c4e3198229306299b6b
Signed-off-by: dongjiuzhu <dongjiuzhu1@xiaomi.com>
modify the return value according to posix standard
Change-Id: I6e32a8f7a5cac85fe7a395a8115710fdff61d985
Signed-off-by: dongjiuzhu <dongjiuzhu1@xiaomi.com>
The following errors are intentionally left.
They are a part of tables which are not trivial to fix.
libs/libc/machine/arm/armv7-m/arch_elf.c:230:94: error: Long line found
libs/libc/machine/arm/armv7-m/arch_elf.c:232:89: error: Long line found
libs/libc/machine/arm/armv7-m/arch_elf.c:240:94: error: Long line found
libs/libc/machine/arm/armv7-m/arch_elf.c:242:89: error: Long line found
libs/libc/machine/arm/armv7-m/arch_elf.c:403:94: error: Long line found
libs/libc/machine/arm/armv7-m/arch_elf.c:405:91: error: Long line found
libs/libc/machine/arm/armv7-m/arch_elf.c:413:94: error: Long line found
libs/libc/machine/arm/armv7-m/arch_elf.c:415:91: error: Long line found
Also implement getpagesize() based on sysconf(_SC_PAGESIZE).
Change-Id: I812eb8f34ed602f7bc12c4cafafcebc0d98fd136
Signed-off-by: liuhaitao <liuhaitao@xiaomi.com>
The previous implementation of strtoul(l) is flawed. The range check
assumed that when overflow happens, the truncated value is smaller than
the original value. As a counter example, passing "10000000000" to
strtol will not trigger ERANGE, but return a truncated value. This patch
adds more accurate range checks.
Change-Id: I239e034e390b4974157ed6efa17110f2e74904cf
Signed-off-by: Peter Bee <bijunda1@xiaomi.com>
since it is wrong to close the builtin stream and specially note
https://pubs.opengroup.org/onlinepubs/9699919799/functions/fclose.html:
Since after the call to fclose() any use of stream results in
undefined behavior, fclose() should not be used on stdin, stdout,
or stderr except immediately before process termination (see XBD
Process Termination), so as to avoid triggering undefined behavior
in other standard interfaces that rely on these streams. If there
are any atexit() handlers registered by the application, such a
call to fclose() should not occur until the last handler is
finishing. Once fclose() has been used to close stdin, stdout, or
stderr, there is no standard way to reopen any of these streams.
and it is also unnecessary because the stream always get flushed.
Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
Follow the POSIX description.
SIGTSTP should be sent when the Ctrl-Z characters is encountered, not SIGSTP.
Testing:
Built with hifive1-revb:nsh (CONFIG_SERIAL_TERMIOS=y, CONFIG_SIG_DEFAULT=y and CONFIG_TTY_SIGTSTP=y)
