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A lua library to spawn programs

License: MIT License

Lua 12.76% C 87.24%

lua execute spawn run start process

lua-spawn's Introduction

A lua library to spawn programs

Status

Features

High level functions for common cases
Bindings to the full posix_spawn family of functions
Compatible with Lua 5.1, 5.2, 5.3 and LuaJIT

Currently only works on POSIXy systems, but the high level module should be portable to Windows; someone just needs to put the work in.

Installation

It's recommended to install lua-spawn by using luarocks. This will automatically install run-time lua dependencies for you.

$ luarocks install spawn

Rationale

Spawning a new child program from a lua script is surprisingly hard.

Existing solutions:

os.execute doesn't allow interaction with any file descriptors
io.popen only allows interaction with one of stdin or stdout
fork + exec isn't portable to non-MMU or non-unix architectures

This project uses the posix_spawn family of functions.

lua-spawn's People

Contributors

Stargazers

Watchers

Forkers

gcr llmii kou xxtouchng

lua-spawn's Issues

luaL_checkarraystrings doesn't ensure livelyness of strings

The use of lua_geti can invoke metamethods (which might dynamically create a string); while the popping of the string will drop all references to it.
Combined this makes the current implementation of luaL_checkarraystrings unsafe.

Return pid from waitpid

Currently returns true/nil,what,code which doesn't include the pid we just got the code of.

Support SETSID

Now approved by POSIX.

Available in recent glibc and musl

Builds on OSX fail because scheduling affinity flags are not supported.

On this platform, the definitions of POSIX_SPAWN_SETSCHEDPARAM are commented out in spawn.h, so luarocks make fails with the following errors:

spawn/posix.c:185:29: error: use of undeclared identifier 'POSIX_SPAWN_SETSCHEDPARAM'
        lua_pushboolean(L, flags & POSIX_SPAWN_SETSCHEDPARAM);
                                   ^
spawn/posix.c:187:29: error: use of undeclared identifier 'POSIX_SPAWN_SETSCHEDULER'
        lua_pushboolean(L, flags & POSIX_SPAWN_SETSCHEDULER);
                                   ^
spawn/posix.c:210:37: error: use of undeclared identifier 'POSIX_SPAWN_SETSCHEDPARAM'
        if (lua_toboolean(L, -1)) flags |= POSIX_SPAWN_SETSCHEDPARAM;
                                           ^
spawn/posix.c:212:37: error: use of undeclared identifier 'POSIX_SPAWN_SETSCHEDULER'
        if (lua_toboolean(L, -1)) flags |= POSIX_SPAWN_SETSCHEDULER;
                                           ^
spawn/posix.c:261:16: warning: implicit declaration of function 'posix_spawnattr_getschedpolicy' is invalid in C99 [-Wimplicit-function-declaration]
        if (0 != (r = posix_spawnattr_getschedpolicy(attr, &schedpolicy))) {
                      ^
spawn/posix.c:275:16: warning: implicit declaration of function 'posix_spawnattr_setschedpolicy' is invalid in C99 [-Wimplicit-function-declaration]
        if (0 != (r = posix_spawnattr_setschedpolicy(attr, schedpolicy))) {
                      ^
2 warnings and 4 errors generated.

Error: Build error: Failed compiling object spawn/posix.o
env MACOSX_DEPLOYMENT_TARGET=10.8 gcc -O2 -fPIC -I/Users/michael/local/torch/install/include -c spawn/kill.c -o spawn/kill.o -D_POSIX_C_SOURCE=1 -Ivendor/compat-5.3/c-api/
env MACOSX_DEPLOYMENT_TARGET=10.8 gcc -O2 -fPIC -I/Users/michael/local/torch/install/include -c spawn/posix.c -o spawn/posix.o -D_POSIX_C_SOURCE=1 -Ivendor/compat-5.3/c-api/

If attrp is NULL, then the default behaviors described above for each flag apply.