michallenc opened a new issue, #16555:
URL: https://github.com/apache/nuttx/issues/16555
### Description / Steps to reproduce the issue
Unix local datagram sockets seems to be broken on NuttX. The following code
doesn't work on `sim:udgram` configuration (nor other configurations with
`CONFIG_NET=y`, including real hardware). The code basically creates a local
unix socket and then polls for `POLLIN`. However, the poll fails on `POLLERR`,
but no `errno` is set during subsequent `read` call (and `read` returns 0). I
think the POSIX states that subsequent `read` should return `-1` and set
`errno` in this case. You can compile it on both Linux and NuttX to reproduce,
just run the application without argument (or with `'s'`) for server and with
`'c'` for a client). The code works on Linux as expected - server polls, client
sends 10 and server receives and prints the value. No `POLLERR` occurs.
```c
#include <errno.h>
#include <poll.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <unistd.h>
#define SOCKET_PATH "/tmp/socket.sock"
void run_client(void) {
int sock = socket(AF_UNIX, SOCK_DGRAM, 0);
if (sock < 0) {
printf("Failed to open socket.");
return;
}
struct sockaddr_un name;
name.sun_family = AF_UNIX;
strcpy(name.sun_path, SOCKET_PATH);
uint8_t data = 10;
if (sendto(sock, &data, sizeof data, 0, (const struct sockaddr *)&name,
sizeof name) < 0) {
printf("Failed to send data.");
}
close(sock);
}
void run_server(void) {
int sock = socket(AF_UNIX, SOCK_DGRAM, 0);
if (sock == -1) {
printf("Failed to create a socket: %d", errno);
return;
}
struct sockaddr_un addr;
memset(&addr, 0, sizeof addr);
addr.sun_family = AF_UNIX;
strcpy(addr.sun_path, SOCKET_PATH);
if (bind(sock, (const struct sockaddr *)&addr, sizeof addr) == -1) {
printf("Failed to bind a socket: %d", errno);
close(sock);
return;
}
struct pollfd pfd = {.fd = sock, .events = POLLIN};
uint8_t data;
while (true) {
int ret = poll(&pfd, 1, 10000);
if (ret == -1 || ret == 0) {
printf("timeout\n");
continue;
} else if (pfd.revents & POLLIN) {
read(sock, &data, sizeof data);
printf("data = %d\n", data);
} else if (pfd.revents & POLLERR) {
read(sock, &data, sizeof data);
printf("pollerr = %d\n", errno);
break;
}
}
close(sock);
}
int main(int argc, char *argv[]) {
bool server = true;
if (argc > 1) {
server = argv[1][0] == 's';
}
if (server)
run_server();
else
run_client();
return 0;
}
```
The example application `CONFIG_EXAMPLES_UDGRAM` without polling doesn't
work as well. Running server (`sim:udgram` config as well) results in
```
nsh> server
server: 0. Receiving up 1024 bytes
server: 0. Received 0 bytes from a pathname client
server: 0. ERROR recv size incorrect: 0 vs 96
```
This seems like `recv` on socket returns immediately even when it's set as a
blocking socket. And this is `AF_LOCAL` socket, not `AF_UNIX`.
I will get to this issue in few days, just putting it here now to see if
anyone hasn't already encountered this problem. Maybe it is some kind of an
issue in a configuration? Btw, I checked citests and we don't seem to test this
at all, both `CM_SOCKET_TEST` and `CM_SYSCALL_TEST` are not selected in
`sim:citest` configuration. I invested few minutes into running them, but there
seem to be many more issues, basically wasn't able to run `CM_SYSCALL_TEST`,
where unix datagram test is located, at all.
### On which OS does this issue occur?
[OS: Linux]
### What is the version of your OS?
Ubuntu 22.04.5 LTS Linux 6.8.0-60-generic
### NuttX Version
master
### Issue Architecture
[Arch: all]
### Issue Area
[Area: Networking], [Area: Posix], [Area: Kernel]
### Host information
```
file sysinfo.h not exists
NuttX CFLAGS:
--g\
-fomit-frame-pointer
-fno-common
-fvisibility=hidden
-ffunction-sections
-fdata-sections
-Wall
-Wstrict-prototypes
-Wshadow
-Wundef
-Wno-attributes
-Wno-unknown-pragmas
-fno-pic
-mcmodel=medium
-isystem /home/michal/Michal/GIT/nuttx-fork/samv7/include
-D__NuttX__
-DNDEBUG
-U_AIX
-U_WIN32
-U__APPLE__
-U__FreeBSD__
-U__NetBSD__
-U__linux__
-U__sun__
-U__unix__
-U__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__
NuttX CXXFLAGS:
--g\
-fomit-frame-pointer
-fno-common
-fvisibility=hidden
-ffunction-sections
-fdata-sections
-Wall
-Wshadow
-Wundef
-Wno-attributes
-Wno-unknown-pragmas
-nostdinc++
-fno-exceptions
-fcheck-new
-fno-rtti
-fno-pic
-mcmodel=medium
-isystem /home/michal/Michal/GIT/nuttx-fork/samv7/include/cxx
-isystem /home/michal/Michal/GIT/nuttx-fork/samv7/include
-D__NuttX__
-DNDEBUG
-U_AIX
-U_WIN32
-U__APPLE__
-U__FreeBSD__
-U__NetBSD__
-U__linux__
-U__sun__
-U__unix__
-U__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__
NuttX LDFLAGS:
-Wl--gc-sections
-Wl-Ttext-segment=0x40000000
-Wl-Map=/home/michal/Michal/GIT/nuttx-fork/samv7/nuttx.map
-Wl-Map=/home/michal/Michal/GIT/nuttx-fork/samv7/nuttx.map
-Wl-no-pie
NuttX configuration options:
CONFIG_HOST_LINUX=y
CONFIG_APPS_DIR=\../apps\
CONFIG_BASE_DEFCONFIG=\sim:udgram\
CONFIG_BUILD_FLAT=y
CONFIG_OUTPUT_STRIP_PATHS=y
CONFIG_ARCH_HAVE_MATH_H=y
CONFIG_ARCH_HAVE_SETJMP=y
CONFIG_ARCH_SETJMP_H=y
CONFIG_ARCH_NONE_DEBUG_H=y
CONFIG_FORTIFY_SOURCE=0
CONFIG_NDEBUG=y
CONFIG_ARCH_HAVE_STACKCHECK=y
CONFIG_STACK_USAGE_WARNING=0
CONFIG_DEBUG_SYMBOLS=y
CONFIG_DEBUG_SYMBOLS_LEVEL=\-g\
CONFIG_ARCH_HAVE_CUSTOMOPT=y
CONFIG_DEBUG_NOOPT=y
CONFIG_LTO_NONE=y
CONFIG_DEBUG_OPT_UNUSED_SECTIONS=y
CONFIG_DEBUG_LINK_MAP=y
CONFIG_ARCH_SIM=y
CONFIG_ARCH=\sim\
CONFIG_ARCH_CHIP=\sim\
CONFIG_HOST_X86_64=y
CONFIG_SIM_TOOLCHAIN_GCC=y
CONFIG_SIM_X8664_SYSTEMV=y
CONFIG_SIM_WALLTIME_SLEEP=y
CONFIG_SIM_LOOPTASK_PRIORITY=224
CONFIG_SIM_LOOPTASK_INTERVAL=10000
CONFIG_SIM_STACKSIZE_ADJUSTMENT=65536
CONFIG_SIM_OFFLOAD_NUM_BUFFERS=2
CONFIG_SIM_OFFLOAD_BUFFER_NUMBYTES=32767
CONFIG_SIM_UART_DMA=y
CONFIG_SIM_UART_NUMBER=0
CONFIG_SIM_CUSTOM_DATA_SECTION=\\
CONFIG_ARCH_TOOLCHAIN_GNU=y
CONFIG_ARCH_TOOLCHAIN_GCC=y
CONFIG_ARCH_HAVE_TEXT_HEAP=y
CONFIG_ARCH_HAVE_MULTICPU=y
CONFIG_ARCH_HAVE_FORK=y
CONFIG_ARCH_HAVE_POWEROFF=y
CONFIG_ARCH_HAVE_TESTSET=y
CONFIG_ARCH_HAVE_RTC_SUBSECONDS=y
CONFIG_ARCH_HAVE_SYSCALL_HOOKS=y
CONFIG_ARCH_HAVE_BACKTRACE=y
CONFIG_ARCH_HAVE_CPUINFO=y
CONFIG_ARCH_CPUINFO_FREQ_KHZ=0
CONFIG_ARCH_HAVE_TCBINFO=y
CONFIG_BOARD_LOOPSPERMSEC=0
CONFIG_BOOT_RUNFROMEXTSRAM=y
CONFIG_RAM_START=0x0
CONFIG_RAM_SIZE=0
CONFIG_ARCH_BOARD_SIM=y
CONFIG_ARCH_BOARD=\sim\
CONFIG_ARCH_HAVE_BUTTONS=y
CONFIG_ARCH_HAVE_IRQBUTTONS=y
CONFIG_BOARD_CRASHDUMP_NONE=y
CONFIG_BOARDCTL=y
CONFIG_BOARDCTL_MKRD=y
CONFIG_BOARD_MEMORY_RANGE=\\
CONFIG_DISABLE_OS_API=y
CONFIG_ARCH_HAVE_TICKLESS=y
CONFIG_USEC_PER_TICK=10000
CONFIG_TIMER_ADJUST_USEC=0
CONFIG_ARCH_HAVE_TIMEKEEPING=y
CONFIG_START_YEAR=2008
CONFIG_START_MONTH=6
CONFIG_START_DAY=1
CONFIG_PREALLOC_TIMERS=8
CONFIG_IRQ_NWORKS=8
CONFIG_IRQ_WORK_SECTION=\\
CONFIG_IRQ_WORK_STACKSIZE=2048
CONFIG_INIT_ENTRY=y
CONFIG_INIT_ARGS=\\
CONFIG_INIT_STACKSIZE=2048
CONFIG_INIT_PRIORITY=100
CONFIG_INIT_ENTRYPOINT=\nsh_main\
CONFIG_INIT_ENTRYNAME=\nsh_main\
CONFIG_ETC_ROMFS=y
CONFIG_ETC_ROMFSMOUNTPT=\/etc\
CONFIG_ETC_ROMFSDEVNO=1
CONFIG_ETC_ROMFSSECTSIZE=64
CONFIG_ETC_FATDEVNO=2
CONFIG_ETC_FATSECTSIZE=512
CONFIG_ETC_FATNSECTORS=1024
CONFIG_ETC_FATMOUNTPT=\/tmp\
CONFIG_RR_INTERVAL=0
CONFIG_TASK_NAME_SIZE=31
CONFIG_SCHED_HAVE_PARENT=y
CONFIG_SCHED_WAITPID=y
CONFIG_PTHREAD_MUTEX_ROBUST=y
CONFIG_PTHREAD_MUTEX_DEFAULT_PRIO_NONE=y
CONFIG_SCHED_CPULOAD_NONE=y
CONFIG_SCHED_CPULOAD_TICKSPERSEC=100
CONFIG_SCHED_PROFILE_TICKSPERSEC=1000
CONFIG_SCHED_STACK_RECORD=0
CONFIG_DEV_CONSOLE=y
CONFIG_NFILE_DESCRIPTORS_PER_BLOCK=8
CONFIG_FILE_STREAM=y
CONFIG_SIG_PREALLOC_ACTIONS=4
CONFIG_SIG_ALLOC_ACTIONS=1
CONFIG_SIG_PREALLOC_IRQ_ACTIONS=8
CONFIG_PREALLOC_MQ_MSGS=8
CONFIG_PREALLOC_MQ_IRQ_MSGS=8
CONFIG_MQ_MAXMSGSIZE=32
CONFIG_SCHED_WORKQUEUE=y
CONFIG_SCHED_HPWORK=y
CONFIG_SCHED_HPNTHREADS=1
CONFIG_SCHED_HPWORKPRIORITY=224
CONFIG_SCHED_HPWORKSTACKSIZE=2048
CONFIG_DEFAULT_TASK_STACKSIZE=2048
CONFIG_IDLETHREAD_STACKSIZE=8192
CONFIG_PTHREAD_STACK_MIN=256
CONFIG_PTHREAD_STACK_DEFAULT=2048
CONFIG_PID_INITIAL_COUNT=16
CONFIG_ONESHOT=y
CONFIG_ALARM_ARCH=y
CONFIG_BCH=y
CONFIG_BCH_BUFFER_ALIGNMENT=0
CONFIG_DEV_NULL=y
CONFIG_DEV_ZERO=y
CONFIG_DEV_OPTEE_NONE=y
CONFIG_DRVR_MKRD=y
CONFIG_NETDEVICES=y
CONFIG_NETDEV_HPWORK_THREAD=y
CONFIG_NET_IGC_TXDESC=256
CONFIG_NET_IGC_RXDESC=256
CONFIG_PIPES=y
CONFIG_DEV_PIPE_MAXSIZE=65535
CONFIG_DEV_PIPE_SIZE=1024
CONFIG_DEV_FIFO_SIZE=1024
CONFIG_DEV_PIPE_VFS_PATH=\/var/pipe\
CONFIG_DEV_PIPE_NPOLLWAITERS=4
CONFIG_ARCH_HAVE_SERIAL_TERMIOS=y
CONFIG_SERIAL=y
CONFIG_SERIAL_CONSOLE=y
CONFIG_SERIAL_NPOLLWAITERS=4
CONFIG_SERIAL_IFLOWCONTROL=y
CONFIG_SERIAL_TXDMA=y
CONFIG_SERIAL_RXDMA=y
CONFIG_SYSLOG=y
CONFIG_SYSLOG_DEFAULT_MASK=0xff
CONFIG_SYSLOG_CRLF=y
CONFIG_SYSLOG_MAX_CHANNELS=1
CONFIG_SYSLOG_DEVPATH=\/dev/ttyS1\
CONFIG_SYSLOG_DEFAULT=y
CONFIG_ARCH_HAVE_NET=y
CONFIG_NET=y
CONFIG_NET_DEFAULT_MIN_PORT=4096
CONFIG_NET_DEFAULT_MAX_PORT=32000
CONFIG_NET_GUARDSIZE=2
CONFIG_NET_LL_GUARDSIZE=0
CONFIG_NET_RECV_BUFSIZE=0
CONFIG_NET_IPFORWARD_ALLOC_STRUCT=1
CONFIG_NET_PREALLOC_DEVIF_CALLBACKS=16
CONFIG_NET_ALLOC_DEVIF_CALLBACKS=0
CONFIG_NET_IPV4_CHECKSUMS=y
CONFIG_NET_LOCAL=y
CONFIG_NET_LOCAL_VFS_PATH=\/var/run\
CONFIG_NET_LOCAL_DGRAM=y
CONFIG_NET_IGMP_CHECKSUMS=y
CONFIG_NET_SNOOP_BUFSIZE=4096
CONFIG_NET_RECV_PACK=y
CONFIG_FS_NEPOLL_DESCRIPTORS=8
CONFIG_FS_LOCK_BUCKET_SIZE=0
CONFIG_SENDFILE_BUFSIZE=512
CONFIG_FS_BACKTRACE=0
CONFIG_FS_MQUEUE_VFS_PATH=\/var/mqueue\
CONFIG_FS_MQUEUE_NPOLLWAITERS=4
CONFIG_FS_ANONMAP=y
CONFIG_FS_FAT=y
CONFIG_FAT_LCNAMES=y
CONFIG_FAT_LFN=y
CONFIG_FAT_MAXFNAME=32
CONFIG_FAT_LFN_ALIAS_TRAILCHARS=0
CONFIG_FS_ROMFS=y
CONFIG_FS_ROMFS_CACHE_NODE=y
CONFIG_FS_ROMFS_CACHE_FILE_NSECTORS=1
CONFIG_FS_PROCFS=y
CONFIG_NXFONTS_PACKEDMSFIRST=y
CONFIG_MM_DEFAULT_MANAGER=y
CONFIG_MM_DEFAULT_ALIGNMENT=8
CONFIG_MM_REGIONS=1
CONFIG_MM_MAP_COUNT_MAX=1024
CONFIG_MM_BACKTRACE=-1
CONFIG_MM_FREE_DELAYCOUNT_MAX=0
CONFIG_MM_HEAP_BIGGEST_COUNT=30
CONFIG_MM_HEAP_MEMPOOL_THRESHOLD=-1
CONFIG_PATH_INITIAL=\/bin\
CONFIG_BINFMT_ELF_RELOCATABLE=y
CONFIG_STDIO_BUFFER_SIZE=64
CONFIG_STDIO_LINEBUFFER=y
CONFIG_NUNGET_CHARS=2
CONFIG_LIBC_LONG_LONG=y
CONFIG_ARCH_LOWPUTC=y
CONFIG_LIBC_RAND_ORDER=1
CONFIG_LIBC_HOMEDIR=\/\
CONFIG_LIBC_TMPDIR=\/tmp\
CONFIG_LIBC_MAX_TMPFILE=32
CONFIG_LIBC_MAX_EXITFUNS=1
CONFIG_LIBC_EXECFUNCS=y
CONFIG_POSIX_SPAWN_DEFAULT_STACKSIZE=2048
CONFIG_LIBC_HOSTNAME=\\
CONFIG_LIBC_OPEN_MAX=256
CONFIG_NAME_MAX=32
CONFIG_PATH_MAX=256
CONFIG_LINE_MAX=80
CONFIG_LIBC_STRERROR_ERRNUM=y
CONFIG_LIBC_STRSIGNAL=y
CONFIG_TLS_NELEM=0
CONFIG_TLS_TASK_NELEM=0
CONFIG_TLS_NCLEANUP=0
CONFIG_LIBC_GAISTRERROR_ERRNUM=y
CONFIG_LIBC_ENVPATH=y
CONFIG_LIBC_FTOK_VFS_PATH=\/var/ftok\
CONFIG_LIBC_MEMFD_ERROR=y
CONFIG_LIBC_TEMPBUFFER=y
CONFIG_LIBC_MAX_TEMPBUFFER=2
CONFIG_LIBC_TEMPBUFFER_MALLOC=y
CONFIG_LIBC_MUTEX_BACKTRACE=0
CONFIG_BUILTIN=y
CONFIG_STREAM_OUT_BUFFER_SIZE=64
CONFIG_STREAM_HEXDUMP_BUFFER_SIZE=128
CONFIG_STREAM_BASE64_BUFFER_SIZE=128
CONFIG_LIBC_INLINE_QUEUE=y
CONFIG_LIBM_TOOLCHAIN=y
CONFIG_BUILTIN_TOOLCHAIN=y
CONFIG_COVERAGE_NONE=y
CONFIG_COVERAGE_DEFAULT_PREFIX_STRIP=\99\
CONFIG_COVERAGE_DEFAULT_PREFIX=\/data\
CONFIG_PROFILE_NONE=y
CONFIG_EXAMPLES_HELLO=y
CONFIG_EXAMPLES_HELLO_PROGNAME=\hello\
CONFIG_EXAMPLES_HELLO_PRIORITY=100
CONFIG_EXAMPLES_HELLO_STACKSIZE=2048
CONFIG_EXAMPLES_UDGRAM=y
CONFIG_EXAMPLES_UDGRAM_ADDR=\/dev/fifo\
CONFIG_EXAMPLES_UDGRAM_SERVER_STACKSIZE=8192
CONFIG_EXAMPLES_UDGRAM_SERVER_PRIORITY=100
CONFIG_EXAMPLES_UDGRAM_SERVER_PROGNAME=\server\
CONFIG_EXAMPLES_UDGRAM_CLIENT_STACKSIZE=8192
CONFIG_EXAMPLES_UDGRAM_CLIENT_PRIORITY=100
CONFIG_EXAMPLES_UDGRAM_CLIENT_PROGNAME=\client\
CONFIG_FSUTILS_MKFATFS=y
CONFIG_MKFATFS_BUFFER_ALIGNMENT=0
CONFIG_NETUTILS_NETINIT=y
CONFIG_NETUTILS_NETLIB=y
CONFIG_NSH_LIBRARY=y
CONFIG_NSH_PROMPT_STRING=\nsh> \
CONFIG_NSH_PROMPT_MAX=32
CONFIG_NSH_PROMPT_ENV=\PS1\
CONFIG_NSH_PROMPT_SUFFIX=\> \
CONFIG_NSH_READLINE=y
CONFIG_NSH_QUOTE=y
CONFIG_NSH_MAXARGUMENTS=7
CONFIG_NSH_ARGCAT=y
CONFIG_NSH_NESTDEPTH=3
CONFIG_NSH_ALIAS=y
CONFIG_NSH_ALIAS_MAX_AMOUNT=1
CONFIG_NSH_PIPELINE=y
CONFIG_NSH_BUILTIN_APPS=y
CONFIG_NSH_FILE_APPS=y
CONFIG_NSH_DISABLE_DATE=y
CONFIG_NSH_DISABLE_LOSMART=y
CONFIG_NSH_DISABLE_LOMTD=y
CONFIG_NSH_DISABLE_MB=y
CONFIG_NSH_DISABLE_MH=y
CONFIG_NSH_DISABLE_MW=y
CONFIG_NSH_DISABLE_TIMEDATECTL=y
CONFIG_NSH_CODECS_BUFSIZE=128
CONFIG_NSH_PROC_MOUNTPOINT=\/proc\
CONFIG_NSH_FILEIOSIZE=1024
CONFIG_NSH_SYSINITSCRIPT=\init.d/rc.sysinit\
CONFIG_NSH_INITSCRIPT=\init.d/rcS\
CONFIG_NSH_SCRIPT_REDIRECT_PATH=\\
CONFIG_NSH_CONSOLE=y
CONFIG_NSH_ARCHINIT=y
CONFIG_NSH_NETINIT=y
CONFIG_NSH_WGET_BUFF_SIZE=512
CONFIG_SYSTEM_DD=y
CONFIG_SYSTEM_DD_PROGNAME=\dd\
CONFIG_SYSTEM_DD_PRIORITY=100
CONFIG_SYSTEM_DD_STACKSIZE=2048
CONFIG_SYSTEM_DD_STATS=y
CONFIG_SYSTEM_NSH=y
CONFIG_SYSTEM_NSH_PRIORITY=100
CONFIG_SYSTEM_NSH_STACKSIZE=2048
CONFIG_SYSTEM_NSH_PROGNAME=\nsh\
CONFIG_SYSTEM_READLINE=y
CONFIG_READLINE_HAVE_EXTMATCH=y
CONFIG_READLINE_ECHO=
```
### Verification
- [x] I have verified before submitting the report.
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