unix.sa


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------------------------->  GNU Sather - sourcefile  <-------------------------
-- Copyright (C) 1994 by International Computer Science Institute            --
-- This file is part of the GNU Sather library. It is free software; you may --
-- redistribute  and/or modify it under the terms of the GNU Library General --
-- Public  License (LGPL)  as published  by the  Free  Software  Foundation; --
-- either version 2 of the license, or (at your option) any later version.   --
-- This  library  is distributed  in the  hope that it will  be  useful, but --
-- WITHOUT ANY WARRANTY without even the implied warranty of MERCHANTABILITY --
-- or FITNESS FOR A PARTICULAR PURPOSE. See Doc/LGPL for more details.       --
-- The license text is also available from:  Free Software Foundation, Inc., --
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-------------->  Please email comments to <bug-sather@gnu.org>  <--------------


class UNIX

class UNIX is system(s:STR):INT is return C_UNIX::system(s); end; sather_home: STR is r ::= get_env("SATHER_HOME"); if void(r) then r := "/usr/lib/sather"; end; if r[r.size-1] = '/' then raise "Environment variable SATHER_HOME should not end with /"; end; return r; end; get_env(var:STR):STR is r::=C_UNIX::getenv(var); if void(r) then return void; else return STR::create_from_c_string(r); end; end; exit(code:INT) is C_UNIX::exit(code); end; abort is C_UNIX::abort; end; execve(prog:STR, argv:ARRAY{STR}, envp:ARRAY{STR}):INT is -- Execute a file, by transforming the calling process into a -- new process. If `execve' returns to the calling process, -- the returned value will be -1, ie an error has occurred. -- `argv', `envp' should have a null pointer as the last pointer. new_argv: EXT_OB; if (argv.size /= 0) then argv_sz:INT := argv.asize; new_argv := RUNTIME::rt_create_astr(argv.size, STR::concat_all(argv)); end; -- if new_envp: EXT_OB; if (envp.size /= 0) then envp_sz:INT := envp.asize; new_envp := RUNTIME::rt_create_astr(envp.size, STR::concat_all(envp)); end; -- if return C_UNIX::execve(prog, new_argv, new_envp); end; -- execve end; -- UNIX

external class C_UNIX

external class C_UNIX is system(s:STR):INT; getenv(var:STR):EXT_OB; exit(code:INT); execve(prog:STR, argv:EXT_OB, envp: EXT_OB): INT; abort; end;