41 lines
1.1 KiB
Lua
41 lines
1.1 KiB
Lua
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-- adapted from https://gist.github.com/iMega/f47f5a2ae1f02d7d5769a008538fd925
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local ffi = require 'ffi'
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local C = ffi.C
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ffi.cdef([[
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typedef int32_t pid_t;
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pid_t fork(void);
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int open(const char *pathname, int flags, int mode);
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int close(int fd);
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int dup2(int oldfd, int newfd);
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int execvp(const char *file, char *const argv[]);
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]])
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local bor = bit.bor
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local ffi_cast = ffi.cast
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local k_char_p_arr_t = ffi.typeof('const char * [?]')
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local char_p_k_p_t = ffi.typeof('char * const *')
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local function spawn(args)
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if not args or #args == 0 then error("couldn't tokenize cmd_line") end
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local pid = C.fork()
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if pid < 0 then
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error("fork failed " .. ffi.errno())
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elseif pid == 0 then -- child process
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local argv = k_char_p_arr_t(#args + 1) -- automatically NULL terminated
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for i = 1, #args do
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argv[i-1] = args[i] -- args is 1-based Lua table, argv is 0-based C array
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end
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local res = C.execvp(args[1], ffi_cast(char_p_k_p_t, argv))
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if res == -1 then error("execvp failed with " .. ffi.errno()) end
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-- HERE SHOULD BE UNREACHABLE!!
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else
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return pid
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end
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end
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return spawn
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