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错误“没有这样的设备或地址”来自child_process.exec，管道有帮助。为什么？

发布于 2025-02-13 09:13:14 字数 13225 浏览 0 评论 0 原文

我正在使用 child_process.exec 执行各种被子命令并捕获其输出。除 Quilt Graph 外，这对于所有命令都可以正常工作。这会导致错误“没有此类设备或地址”。如果我从命令行运行命令，则不会发生该错误。

Quilt Graph命令是一个bash脚本，运行（略微解释）

cat $QUILT_PC/applied_patches | eval $QUILT_DIR/scripts/dependency-graph - $pipe

文件 applied_pa​​tches 包含一个补丁列表， dependency-graph 是一个perl脚本， pipe pipe 是一个空字符串或 |点-TPS 。

我注意到 child_process.exec 如果管道实际上是一个管道，则不会失败。由于我不希望PostScript输出（这是 | dot -tps 做的），所以我附加了 | cat child_process.exec 的参数，现在执行类似 Quilt Graph |猫。但这显然是一个小事。

使用 child_process.exec 运行 strace/usr/bin/quilt graph 

...
stat("/usr/share/quilt/compat/bash", {st_mode=S_IFREG|0755, st_size=1234376, ...}) = 0
geteuid()                               = 1000
getegid()                               = 1000
getuid()                                = 1000
getgid()                                = 1000
access("/usr/share/quilt/compat/bash", R_OK) = 0
rt_sigprocmask(SIG_BLOCK, NULL, [], 8)  = 0
rt_sigprocmask(SIG_BLOCK, [INT TERM CHLD], [], 8) = 0
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x7faa1838aa10) = 32080
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0
rt_sigaction(SIGINT, {sa_handler=0x5574b6621d30, sa_mask=[], sa_flags=SA_RESTORER, sa_restorer=0x7faa183c8d60}, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=SA_RESTORER, sa_restorer=0x7faa183c8d60}, 8) = 0
wait4(-1, No such device or address
[{WIFEXITED(s) && WEXITSTATUS(s) == 6}], 0, NULL) = 32080
rt_sigaction(SIGINT, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=SA_RESTORER, sa_restorer=0x7faa183c8d60}, {sa_handler=0x5574b6621d30, sa_mask=[], sa_flags=SA_RESTORER, sa_restorer=0x7faa183c8d60}, 8) = 0
ioctl(2, TIOCGWINSZ, 0x7ffd8531dd60)    = -1 ENOTTY (Inappropriate ioctl for device)
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=32080, si_uid=1000, si_status=6, si_utime=1, si_stime=0} ---
wait4(-1, 0x7ffd8531d6d0, WNOHANG, NULL) = -1 ECHILD (No child processes)
rt_sigreturn({mask=[]})                 = 0
read(255, "", 2938)                     = 0
rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
exit_group(6)                           = ?
+++ exited with 6 +++

使用 child> child_process.exec 运行 strace> strace -f/usr /bin/quilt Graph 提供

...
[pid 23333] write(1, "./linebuffer.h\n./remotetcp.c\n", 29) = 29
[pid 23320] <... read resumed>"./linebuffer.h\n./remotetcp.c\n", 8192) = 29
[pid 23333] close(1 <unfinished ...>
[pid 23320] read(3,  <unfinished ...>
[pid 23333] <... close resumed>)        = 0
[pid 23333] close(2)                    = 0
[pid 23333] exit_group(0)               = ?
[pid 23333] +++ exited with 0 +++
[pid 23332] <... wait4 resumed>[{WIFEXITED(s) && WEXITSTATUS(s) == 0}], 0, NULL) = 23333
[pid 23332] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=23333, si_uid=1000, si_status=0, si_utime=0, si_stime=1} ---
[pid 23332] rt_sigreturn({mask=[]})     = 23333
[pid 23332] wait4(-1, 0x7ffd722fcb6c, WNOHANG, NULL) = -1 ECHILD (No child processes)
[pid 23332] exit_group(0)               = ?
[pid 23332] +++ exited with 0 +++
[pid 23320] <... read resumed>"", 8192) = 0
[pid 23320] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=23332, si_uid=1000, si_status=0, si_utime=0, si_stime=0} ---
[pid 23320] fstat(3, {st_mode=S_IFIFO|0600, st_size=0, ...}) = 0
[pid 23320] close(3)                    = 0
[pid 23320] wait4(23332, [{WIFEXITED(s) && WEXITSTATUS(s) == 0}], 0, NULL) = 23332
[pid 23320] openat(AT_FDCWD, "/dev/stdout", O_WRONLY|O_CREAT|O_TRUNC|O_CLOEXEC, 0666) = -1 ENXIO (No such device or address)
[pid 23320] write(2, "No such device or address\n", 26No such device or address
) = 26
[pid 23320] rt_sigaction(SIGHUP, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGINT, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGQUIT, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGILL, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGTRAP, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGABRT, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGBUS, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGFPE, NULL, {sa_handler=SIG_IGN, sa_mask=[FPE], sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7f16699c2d60}, 8) = 0
[pid 23320] rt_sigaction(SIGKILL, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGUSR1, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGSEGV, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGUSR2, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGPIPE, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGALRM, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGTERM, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGSTKFLT, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGCHLD, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGCONT, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGSTOP, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGTSTP, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGTTIN, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGTTOU, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGURG, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGXCPU, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGXFSZ, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGVTALRM, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGPROF, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGWINCH, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGIO, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGPWR, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGSYS, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGRT_2, NULL, {sa_handler=SIG_IGN, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGRT_3, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGRT_4, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGRT_5, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGRT_6, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGRT_7, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGRT_8, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGRT_9, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGRT_10, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGRT_11, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGRT_12, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGRT_13, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGRT_14, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGRT_15, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGRT_16, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGRT_17, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGRT_18, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGRT_19, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGRT_20, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGRT_21, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGRT_22, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGRT_23, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGRT_24, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGRT_25, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGRT_26, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGRT_27, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGRT_28, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGRT_29, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGRT_30, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGRT_31, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGRT_32, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGABRT, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGCHLD, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGIO, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] exit_group(6)               = ?
[pid 23320] +++ exited with 6 +++
[pid 23319] <... wait4 resumed>[{WIFEXITED(s) && WEXITSTATUS(s) == 6}], 0, NULL) = 23320
[pid 23319] rt_sigaction(SIGINT, {sa_handler=0x55ad0f08acd0, sa_mask=[], sa_flags=SA_RESTORER, sa_restorer=0x7fc509dd6d60}, {sa_handler=0x55ad0f068d30, sa_mask=[], sa_flags=SA_RESTORER, sa_restorer=0x7fc509dd6d60}, 8) = 0
[pid 23319] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 23319] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=23320, si_uid=1000, si_status=6, si_utime=6, si_stime=9} ---
[pid 23319] wait4(-1, 0x7ffd19cbf710, WNOHANG, NULL) = -1 ECHILD (No child processes)
[pid 23319] rt_sigreturn({mask=[]})     = 0
[pid 23319] exit_group(6)               = ?
[pid 23319] +++ exited with 6 +++
[pid 23299] <... wait4 resumed>[{WIFEXITED(s) && WEXITSTATUS(s) == 6}], 0, NULL) = 23319
[pid 23299] rt_sigaction(SIGINT, {sa_handler=0x55ad0f08acd0, sa_mask=[], sa_flags=SA_RESTORER, sa_restorer=0x7fc509dd6d60}, {sa_handler=0x55ad0f068d30, sa_mask=[], sa_flags=SA_RESTORER, sa_restorer=0x7fc509dd6d60}, 8) = 0
[pid 23299] ioctl(2, TIOCGWINSZ, 0x7ffd19cc00c0) = -1 ENOTTY (Inappropriate ioctl for device)
[pid 23299] rt_sigprocmask(SIG_SETMASK, [CHLD], NULL, 8) = 0
[pid 23299] close(3)                    = -1 EBADF (Bad file descriptor)
[pid 23299] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 23299] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=23318, si_uid=1000, si_status=0, si_utime=0, si_stime=0} ---
[pid 23299] wait4(-1, 0x7ffd19cbfc90, WNOHANG, NULL) = -1 ECHILD (No child processes)
[pid 23299] rt_sigreturn({mask=[]})     = 0
[pid 23299] rt_sigprocmask(SIG_BLOCK, NULL, [], 8) = 0
[pid 23299] rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0
[pid 23299] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 23299] exit_group(6)               = ?
[pid 23299] +++ exited with 6 +++
<... wait4 resumed>[{WIFEXITED(s) && WEXITSTATUS(s) == 6}], 0, NULL) = 23299
rt_sigaction(SIGINT, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=SA_RESTORER, sa_restorer=0x7f76a5bdbd60}, {sa_handler=0x55c3675d9d30, sa_mask=[], sa_flags=SA_RESTORER, sa_restorer=0x7f76a5bdbd60}, 8) = 0
ioctl(2, TIOCGWINSZ, 0x7ffccdbe2b00)    = -1 ENOTTY (Inappropriate ioctl for device)
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=23299, si_uid=1000, si_status=6, si_utime=0, si_stime=3} ---
wait4(-1, 0x7ffccdbe2490, WNOHANG, NULL) = -1 ECHILD (No child processes)
rt_sigreturn({mask=[]})                 = 0
read(255, "", 2938)                     = 0
rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
exit_group(6)                           = ?
+++ exited with 6 +++

某人可以解释是什么原因导致错误以及如何避免它？

原文

I'm using child_process.exec to execute various quilt commands and capture their output. This works fine so far for all commands except for quilt graph. which results in an error "No such device or address". That error does not occur if I run the command from the command line.

The quilt graph command, a Bash script, runs (slightly paraphrased)

cat $QUILT_PC/applied_patches | eval $QUILT_DIR/scripts/dependency-graph - $pipe

The file applied_patches contains a list of patches, dependency-graph is a Perl script, and pipe is either an empty string or | dot -Tps.

I noticed that child_process.exec does not fail if pipe is actually a pipe. Since I don't want PostScript output (which is what | dot -Tps does), I appended | cat to the arguments of child_process.exec and now execute something like quilt graph | cat. But that obviously is a kludge.

Using child_process.exec to run strace /usr/bin/quilt graph gives

...
stat("/usr/share/quilt/compat/bash", {st_mode=S_IFREG|0755, st_size=1234376, ...}) = 0
geteuid()                               = 1000
getegid()                               = 1000
getuid()                                = 1000
getgid()                                = 1000
access("/usr/share/quilt/compat/bash", R_OK) = 0
rt_sigprocmask(SIG_BLOCK, NULL, [], 8)  = 0
rt_sigprocmask(SIG_BLOCK, [INT TERM CHLD], [], 8) = 0
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x7faa1838aa10) = 32080
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0
rt_sigaction(SIGINT, {sa_handler=0x5574b6621d30, sa_mask=[], sa_flags=SA_RESTORER, sa_restorer=0x7faa183c8d60}, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=SA_RESTORER, sa_restorer=0x7faa183c8d60}, 8) = 0
wait4(-1, No such device or address
[{WIFEXITED(s) && WEXITSTATUS(s) == 6}], 0, NULL) = 32080
rt_sigaction(SIGINT, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=SA_RESTORER, sa_restorer=0x7faa183c8d60}, {sa_handler=0x5574b6621d30, sa_mask=[], sa_flags=SA_RESTORER, sa_restorer=0x7faa183c8d60}, 8) = 0
ioctl(2, TIOCGWINSZ, 0x7ffd8531dd60)    = -1 ENOTTY (Inappropriate ioctl for device)
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=32080, si_uid=1000, si_status=6, si_utime=1, si_stime=0} ---
wait4(-1, 0x7ffd8531d6d0, WNOHANG, NULL) = -1 ECHILD (No child processes)
rt_sigreturn({mask=[]})                 = 0
read(255, "", 2938)                     = 0
rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
exit_group(6)                           = ?
+++ exited with 6 +++

Using child_process.exec to run strace -f /usr/bin/quilt graph gives

...
[pid 23333] write(1, "./linebuffer.h\n./remotetcp.c\n", 29) = 29
[pid 23320] <... read resumed>"./linebuffer.h\n./remotetcp.c\n", 8192) = 29
[pid 23333] close(1 <unfinished ...>
[pid 23320] read(3,  <unfinished ...>
[pid 23333] <... close resumed>)        = 0
[pid 23333] close(2)                    = 0
[pid 23333] exit_group(0)               = ?
[pid 23333] +++ exited with 0 +++
[pid 23332] <... wait4 resumed>[{WIFEXITED(s) && WEXITSTATUS(s) == 0}], 0, NULL) = 23333
[pid 23332] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=23333, si_uid=1000, si_status=0, si_utime=0, si_stime=1} ---
[pid 23332] rt_sigreturn({mask=[]})     = 23333
[pid 23332] wait4(-1, 0x7ffd722fcb6c, WNOHANG, NULL) = -1 ECHILD (No child processes)
[pid 23332] exit_group(0)               = ?
[pid 23332] +++ exited with 0 +++
[pid 23320] <... read resumed>"", 8192) = 0
[pid 23320] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=23332, si_uid=1000, si_status=0, si_utime=0, si_stime=0} ---
[pid 23320] fstat(3, {st_mode=S_IFIFO|0600, st_size=0, ...}) = 0
[pid 23320] close(3)                    = 0
[pid 23320] wait4(23332, [{WIFEXITED(s) && WEXITSTATUS(s) == 0}], 0, NULL) = 23332
[pid 23320] openat(AT_FDCWD, "/dev/stdout", O_WRONLY|O_CREAT|O_TRUNC|O_CLOEXEC, 0666) = -1 ENXIO (No such device or address)
[pid 23320] write(2, "No such device or address\n", 26No such device or address
) = 26
[pid 23320] rt_sigaction(SIGHUP, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGINT, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGQUIT, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGILL, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGTRAP, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGABRT, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGBUS, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGFPE, NULL, {sa_handler=SIG_IGN, sa_mask=[FPE], sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7f16699c2d60}, 8) = 0
[pid 23320] rt_sigaction(SIGKILL, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGUSR1, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGSEGV, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGUSR2, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGPIPE, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGALRM, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGTERM, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGSTKFLT, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGCHLD, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGCONT, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGSTOP, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGTSTP, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGTTIN, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGTTOU, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGURG, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGXCPU, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGXFSZ, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGVTALRM, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGPROF, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGWINCH, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGIO, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGPWR, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGSYS, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGRT_2, NULL, {sa_handler=SIG_IGN, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGRT_3, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGRT_4, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGRT_5, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGRT_6, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGRT_7, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGRT_8, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGRT_9, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGRT_10, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGRT_11, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGRT_12, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGRT_13, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGRT_14, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGRT_15, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGRT_16, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGRT_17, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGRT_18, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGRT_19, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGRT_20, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGRT_21, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGRT_22, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGRT_23, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGRT_24, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGRT_25, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGRT_26, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGRT_27, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGRT_28, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGRT_29, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGRT_30, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGRT_31, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGRT_32, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGABRT, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGCHLD, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] rt_sigaction(SIGIO, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 23320] exit_group(6)               = ?
[pid 23320] +++ exited with 6 +++
[pid 23319] <... wait4 resumed>[{WIFEXITED(s) && WEXITSTATUS(s) == 6}], 0, NULL) = 23320
[pid 23319] rt_sigaction(SIGINT, {sa_handler=0x55ad0f08acd0, sa_mask=[], sa_flags=SA_RESTORER, sa_restorer=0x7fc509dd6d60}, {sa_handler=0x55ad0f068d30, sa_mask=[], sa_flags=SA_RESTORER, sa_restorer=0x7fc509dd6d60}, 8) = 0
[pid 23319] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 23319] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=23320, si_uid=1000, si_status=6, si_utime=6, si_stime=9} ---
[pid 23319] wait4(-1, 0x7ffd19cbf710, WNOHANG, NULL) = -1 ECHILD (No child processes)
[pid 23319] rt_sigreturn({mask=[]})     = 0
[pid 23319] exit_group(6)               = ?
[pid 23319] +++ exited with 6 +++
[pid 23299] <... wait4 resumed>[{WIFEXITED(s) && WEXITSTATUS(s) == 6}], 0, NULL) = 23319
[pid 23299] rt_sigaction(SIGINT, {sa_handler=0x55ad0f08acd0, sa_mask=[], sa_flags=SA_RESTORER, sa_restorer=0x7fc509dd6d60}, {sa_handler=0x55ad0f068d30, sa_mask=[], sa_flags=SA_RESTORER, sa_restorer=0x7fc509dd6d60}, 8) = 0
[pid 23299] ioctl(2, TIOCGWINSZ, 0x7ffd19cc00c0) = -1 ENOTTY (Inappropriate ioctl for device)
[pid 23299] rt_sigprocmask(SIG_SETMASK, [CHLD], NULL, 8) = 0
[pid 23299] close(3)                    = -1 EBADF (Bad file descriptor)
[pid 23299] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 23299] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=23318, si_uid=1000, si_status=0, si_utime=0, si_stime=0} ---
[pid 23299] wait4(-1, 0x7ffd19cbfc90, WNOHANG, NULL) = -1 ECHILD (No child processes)
[pid 23299] rt_sigreturn({mask=[]})     = 0
[pid 23299] rt_sigprocmask(SIG_BLOCK, NULL, [], 8) = 0
[pid 23299] rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0
[pid 23299] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 23299] exit_group(6)               = ?
[pid 23299] +++ exited with 6 +++
<... wait4 resumed>[{WIFEXITED(s) && WEXITSTATUS(s) == 6}], 0, NULL) = 23299
rt_sigaction(SIGINT, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=SA_RESTORER, sa_restorer=0x7f76a5bdbd60}, {sa_handler=0x55c3675d9d30, sa_mask=[], sa_flags=SA_RESTORER, sa_restorer=0x7f76a5bdbd60}, 8) = 0
ioctl(2, TIOCGWINSZ, 0x7ffccdbe2b00)    = -1 ENOTTY (Inappropriate ioctl for device)
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=23299, si_uid=1000, si_status=6, si_utime=0, si_stime=3} ---
wait4(-1, 0x7ffccdbe2490, WNOHANG, NULL) = -1 ECHILD (No child processes)
rt_sigreturn({mask=[]})                 = 0
read(255, "", 2938)                     = 0
rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
exit_group(6)                           = ?
+++ exited with 6 +++

Could somebody please explain what causes the error and how to avoid it?

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上课铃就是安魂曲 2025-02-20 09:13:14

strace 输出的这一行是吸烟枪：

[pid 23320] openat(AT_FDCWD, "/dev/stdout", O_WRONLY|O_CREAT|O_TRUNC|O_CLOEXEC, 0666) = -1 ENXIO (No such device or address)

现在注意这些错误 man 2 Openat ：

       ENODEV pathname refers to a device special file and no
              corresponding device exists.  (This is a Linux kernel bug;
              in this situation ENXIO must be returned.)

       ENXIO  O_NONBLOCK | O_WRONLY is set, the named file is a FIFO,
              and no process has the FIFO open for reading.

       ENXIO  The file is a device special file and no corresponding
              device exists.

       ENXIO  The file is a UNIX domain socket.

enxio 不适用的第一个原因，因为 o_nonblock 未设置。第二个原因不适用，因为Linux（不符合）将返回 enodev ，如果确实如此。因此，这指出了第三个原因。让我们尝试一个简单的测试以确认该理论：

const { exec } = require('node:child_process');

exec('tail -f /dev/null');

运行该理论，然后使用 PS 查找孩子的PID，然后do ls -l/proc/proc/pid /fd /。您会看到FD具有 1-＆gt;的条目。 '套接字：[1404159]'，它确认标准的确是Unix域插座。

So the problem is created by a combination of three things:

  2. 由FD 1直接流程。 child> child_process.exec.exec.exec 他们的标准输出
  3. linux不允许您打开或 openat unix域套接字

在 ：

当前，这些不是实际的Unix管道，因此子进程无法通过其描述符文件使用它们，例如/dev/dev/fd/2 或/dev/dev/stdout 。

我不确定为什么Nodejs不仅在此处使用实际管道而不是Unix域插座，而是您的 |解决方法。 CAT 可能是您最小的选项。 （从那以后这样做依赖性图形确实具有真实的管道作为标准输出，并且 cat not dot -tps 尝试打开<<代码>/dev/stdout 喜欢它。）

This line of your strace output is the smoking gun:

[pid 23320] openat(AT_FDCWD, "/dev/stdout", O_WRONLY|O_CREAT|O_TRUNC|O_CLOEXEC, 0666) = -1 ENXIO (No such device or address)

Now notice these errors listed by man 2 openat:

       ENODEV pathname refers to a device special file and no
              corresponding device exists.  (This is a Linux kernel bug;
              in this situation ENXIO must be returned.)

       ENXIO  O_NONBLOCK | O_WRONLY is set, the named file is a FIFO,
              and no process has the FIFO open for reading.

       ENXIO  The file is a device special file and no corresponding
              device exists.

       ENXIO  The file is a UNIX domain socket.

The first reason for ENXIO doesn't apply, since O_NONBLOCK wasn't set. The second reason doesn't apply, since Linux would (non-compliantly) return ENODEV instead if it did. So that points to the third reason. Let's try a simple test to confirm that theory:

const { exec } = require('node:child_process');

exec('tail -f /dev/null');

Run that, then look for the child's PID with ps, and do ls -l /proc/PID/fd/. You'll see the FDs have entries like 1 -> 'socket:[1404159]', which confirms that standard out is indeed a UNIX domain socket.

So the problem is created by a combination of three things:

  1. $QUILT_DIR/scripts/dependency-graph opens /dev/stdout for writing instead of just using FD 1 directly
  2. Processes created by child_process.exec have a UNIX domain socket as their standard output
  3. Linux doesn't let you open or openat a UNIX domain socket

This is somewhat documented under options.stdio:

Currently, these are not actual Unix pipes and therefore the child process can not use them by their descriptor files, e.g. /dev/fd/2 or /dev/stdout.

I'm not sure why nodejs doesn't just use actual pipes instead of UNIX domain sockets here, but your workaround of | cat might be your least-bad option. (Doing that works since then dependency-graph does have a real pipe as standard output, and neither cat nor dot -Tps try to open /dev/stdout like it does.)

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