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osproc: Define and select spawn/fork same way

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Previously startProcessAuxFork was defined even when it was unused, also the
compile time condition to select spawn vs fork was not always the same for
definitions and calls.

This change just defines the condition in one place as constant, then in other
places we just check for `when useProcessAuxSpawn`.
This commit is contained in:
Adam Strzelecki
2015-09-03 18:00:15 +02:00
parent 580855d2eb
commit a9f114cf13
1 changed files with 38 additions and 37 deletions
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75
lib/pure/osproc.nim
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@@ -614,11 +614,14 @@ elif not defined(useNimRtl):
optionPoStdErrToStdOut: bool
{.deprecated: [TStartProcessData: StartProcessData].}
when not defined(useFork):
const useProcessAuxSpawn = declared(posix_spawn) and not defined(useFork) and
not defined(useClone) and not defined(linux)
when useProcessAuxSpawn:
proc startProcessAuxSpawn(data: StartProcessData): Pid {.
tags: [ExecIOEffect, ReadEnvEffect], gcsafe.}
proc startProcessAuxFork(data: StartProcessData): Pid {.
tags: [ExecIOEffect, ReadEnvEffect], gcsafe.}
else:
proc startProcessAuxFork(data: StartProcessData): Pid {.
tags: [ExecIOEffect, ReadEnvEffect], gcsafe.}
{.push stacktrace: off, profiler: off.}
proc startProcessAfterFork(data: ptr StartProcessData) {.
tags: [ExecIOEffect, ReadEnvEffect], cdecl, gcsafe.}
@@ -674,9 +677,7 @@ elif not defined(useNimRtl):
data.optionPoStdErrToStdOut = poStdErrToStdOut in options
data.workingDir = workingDir
when declared(posix_spawn) and not defined(useFork) and
not defined(useClone) and not defined(linux):
when useProcessAuxSpawn:
pid = startProcessAuxSpawn(data)
else:
pid = startProcessAuxFork(data)
@@ -706,7 +707,7 @@ elif not defined(useNimRtl):
discard close(pStdin[readIdx])
discard close(pStdout[writeIdx])
when not defined(useFork):
when useProcessAuxSpawn:
proc startProcessAuxSpawn(data: StartProcessData): Pid =
var attr: Tposix_spawnattr
var fops: Tposix_spawn_file_actions
@@ -752,43 +753,43 @@ elif not defined(useNimRtl):
discard posix_spawnattr_destroy(attr)
chck res
return pid
else:
proc startProcessAuxFork(data: StartProcessData): Pid =
if pipe(data.pErrorPipe) != 0:
raiseOSError(osLastError())
proc startProcessAuxFork(data: StartProcessData): Pid =
if pipe(data.pErrorPipe) != 0:
raiseOSError(osLastError())
defer:
discard close(data.pErrorPipe[readIdx])
defer:
discard close(data.pErrorPipe[readIdx])
var pid: Pid
var dataCopy = data
var pid: Pid
var dataCopy = data
when defined(useClone):
const stackSize = 65536
let stackEnd = cast[clong](alloc(stackSize))
let stack = cast[pointer](stackEnd + stackSize)
let fn: pointer = startProcessAfterFork
pid = clone(fn, stack,
cint(CLONE_VM or CLONE_VFORK or SIGCHLD),
pointer(addr dataCopy), nil, nil, nil)
discard close(data.pErrorPipe[writeIdx])
dealloc(stack)
else:
pid = fork()
if pid == 0:
startProcessAfterFork(addr(dataCopy))
exitnow(1)
when defined(useClone):
const stackSize = 65536
let stackEnd = cast[clong](alloc(stackSize))
let stack = cast[pointer](stackEnd + stackSize)
let fn: pointer = startProcessAfterFork
pid = clone(fn, stack,
cint(CLONE_VM or CLONE_VFORK or SIGCHLD),
pointer(addr dataCopy), nil, nil, nil)
discard close(data.pErrorPipe[writeIdx])
dealloc(stack)
else:
pid = fork()
if pid == 0:
startProcessAfterFork(addr(dataCopy))
exitnow(1)
if pid < 0: raiseOSError(osLastError())
discard close(data.pErrorPipe[writeIdx])
if pid < 0: raiseOSError(osLastError())
var error: cint
let sizeRead = read(data.pErrorPipe[readIdx], addr error, sizeof(error))
if sizeRead == sizeof(error):
raiseOSError("Could not find command: '$1'. OS error: $2" %
[$data.sysCommand, $strerror(error)])
var error: cint
let sizeRead = read(data.pErrorPipe[readIdx], addr error, sizeof(error))
if sizeRead == sizeof(error):
raiseOSError("Could not find command: '$1'. OS error: $2" %
[$data.sysCommand, $strerror(error)])
return pid
return pid
{.push stacktrace: off, profiler: off.}
proc startProcessFail(data: ptr StartProcessData) =