os: add support for signal handling on JS backend (#12818)

pull/12829/head
playX 2021-12-13 21:18:12 +03:00 committed by GitHub
parent d5c0bdf954
commit cb4c67588c
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5 changed files with 184 additions and 42 deletions

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@ -136,3 +136,7 @@ pub fn getuid() int {
pub fn execvp(cmd string, args []string) ? { pub fn execvp(cmd string, args []string) ? {
panic('os.execvp() is not available on JS backend') panic('os.execvp() is not available on JS backend')
} }
pub fn stdin_resume() {
#$process.stdin.resume();
}

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@ -94,6 +94,10 @@ pub fn (mut p Process) stdin_write(s string) {
#p.val.pid.stdin.write(s) #p.val.pid.stdin.write(s)
} }
pub fn (mut p Process) stdin_resume() {
#p.val.pid.stdin.resume()
}
// todo(playX): probably does not work // todo(playX): probably does not work
// will read from stdout pipe, will only return when EOF (end of file) or data // will read from stdout pipe, will only return when EOF (end of file) or data

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@ -2,48 +2,6 @@ module os
#include <signal.h> #include <signal.h>
// os.Signal - enumerate possible POSIX signals and
// their integer codes.
// NB: the integer codes are given here explicitly,
// to make it easier to lookup, without needing to
// consult man pages / signal.h .
pub enum Signal {
hup = 1
int = 2
quit = 3
ill = 4
trap = 5
abrt = 6
bus = 7
fpe = 8
kill = 9
usr1 = 10
segv = 11
usr2 = 12
pipe = 13
alrm = 14
term = 15
stkflt = 16
chld = 17
cont = 18
stop = 19
tstp = 20
ttin = 21
ttou = 22
urg = 23
xcpu = 24
xfsz = 25
vtalrm = 26
prof = 27
winch = 28
poll = 29
pwr = 30
sys = 31
}
type SignalHandler = fn (Signal)
fn C.signal(signal int, handlercb SignalHandler) voidptr fn C.signal(signal int, handlercb SignalHandler) voidptr
// signal will assign `handler` callback to be called when `signum` signal is received. // signal will assign `handler` callback to be called when `signum` signal is received.

133
vlib/os/signal.js.v 100644
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@ -0,0 +1,133 @@
module os
fn signal_str(signal Signal) string {
mut result := signal.str().to_upper()
result = 'SIG$result'
return result
}
fn signal_from_str(str JS.String) Signal {
s := string(str)
return match s {
'SIGHUP' {
Signal.hup
}
'SIGINT' {
Signal.int
}
'SIGQUIT' {
Signal.quit
}
'SIGILL' {
Signal.ill
}
'SIGTRAP' {
Signal.trap
}
'SIGABRT' {
Signal.abrt
}
'SIGBUS' {
Signal.bus
}
'SIGFPE' {
Signal.fpe
}
'SIGKILL' {
Signal.kill
}
'SIGUSR1' {
Signal.usr1
}
'SIGSEGV' {
Signal.segv
}
'SIGUSR2' {
Signal.usr2
}
'SIGPIPE' {
Signal.pipe
}
'SIGALRM' {
Signal.alrm
}
'SIGTERM' {
Signal.term
}
'SIGSTKFLT' {
Signal.stkflt
}
'SIGCHLD' {
Signal.chld
}
'SIGCONT' {
Signal.cont
}
'SIGSTOP' {
Signal.stop
}
'SIGTSTP' {
Signal.tstp
}
'SIGTTIN' {
Signal.ttin
}
'SIGTTOU' {
Signal.ttou
}
'SIGURG' {
Signal.urg
}
'SIGXCPU' {
Signal.xcpu
}
'SIGXFSZ' {
Signal.xfsz
}
'SIGVTALRM' {
Signal.vtalrm
}
'SIGPROF' {
Signal.prof
}
'SIGWINCH' {
Signal.winch
}
'SIGPOLL' {
Signal.poll
}
'SIGPWR' {
Signal.pwr
}
'SIGSYS' {
Signal.sys
}
else {
panic('unknown signal: $s')
}
}
}
// signal will assign `handler` callback to be called when `signum` signal is received.
//
// # Behaviour on different backends:
// - NodeJS: Will use `process.on` and add `handler` to the listeners list for `signum` to happen
// - Browser: Will use `window.addEventListener` for handling signal
//
// TODO: Add signal events implementation for browser backend
pub fn signal_opt(signum Signal, handler SignalHandler) ?SignalHandler {
signame := signal_str(signum)
_ := signame
$if js_node {
#$process.on(signame.str,function (sig) { handler(os__signal_from_str(sig));});
return handler
} $else $if js_browser {
#let event = new CustomEvent(signame.str, {detail: signum});
#window.addEventListener(signame.str, function (e) { handler(e.detail); });
return handler
} $else {
return error('signal handlers are not supported on bare JS')
}
}

43
vlib/os/signal.v 100644
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@ -0,0 +1,43 @@
module os
// os.Signal - enumerate possible POSIX signals and
// their integer codes.
// NB: the integer codes are given here explicitly,
// to make it easier to lookup, without needing to
// consult man pages / signal.h .
pub enum Signal {
hup = 1
int = 2
quit = 3
ill = 4
trap = 5
abrt = 6
bus = 7
fpe = 8
kill = 9
usr1 = 10
segv = 11
usr2 = 12
pipe = 13
alrm = 14
term = 15
stkflt = 16
chld = 17
cont = 18
stop = 19
tstp = 20
ttin = 21
ttou = 22
urg = 23
xcpu = 24
xfsz = 25
vtalrm = 26
prof = 27
winch = 28
poll = 29
pwr = 30
sys = 31
}
type SignalHandler = fn (Signal)