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Diffstat (limited to 'src/engine/SCons/Platform/posix.py')
| -rw-r--r-- | src/engine/SCons/Platform/posix.py | 264 |
1 files changed, 264 insertions, 0 deletions
diff --git a/src/engine/SCons/Platform/posix.py b/src/engine/SCons/Platform/posix.py new file mode 100644 index 0000000..50dfb69 --- /dev/null +++ b/src/engine/SCons/Platform/posix.py @@ -0,0 +1,264 @@ +"""SCons.Platform.posix + +Platform-specific initialization for POSIX (Linux, UNIX, etc.) systems. + +There normally shouldn't be any need to import this module directly. It +will usually be imported through the generic SCons.Platform.Platform() +selection method. +""" + +# +# Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 The SCons Foundation +# +# Permission is hereby granted, free of charge, to any person obtaining +# a copy of this software and associated documentation files (the +# "Software"), to deal in the Software without restriction, including +# without limitation the rights to use, copy, modify, merge, publish, +# distribute, sublicense, and/or sell copies of the Software, and to +# permit persons to whom the Software is furnished to do so, subject to +# the following conditions: +# +# The above copyright notice and this permission notice shall be included +# in all copies or substantial portions of the Software. +# +# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY +# KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE +# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND +# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE +# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION +# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION +# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. +# + +__revision__ = "src/engine/SCons/Platform/posix.py 4577 2009/12/27 19:44:43 scons" + +import errno +import os +import os.path +import string +import subprocess +import sys +import select + +import SCons.Util +from SCons.Platform import TempFileMunge + +exitvalmap = { + 2 : 127, + 13 : 126, +} + +def escape(arg): + "escape shell special characters" + slash = '\\' + special = '"$()' + + arg = string.replace(arg, slash, slash+slash) + for c in special: + arg = string.replace(arg, c, slash+c) + + return '"' + arg + '"' + +def exec_system(l, env): + stat = os.system(string.join(l)) + if stat & 0xff: + return stat | 0x80 + return stat >> 8 + +def exec_spawnvpe(l, env): + stat = os.spawnvpe(os.P_WAIT, l[0], l, env) + # os.spawnvpe() returns the actual exit code, not the encoding + # returned by os.waitpid() or os.system(). + return stat + +def exec_fork(l, env): + pid = os.fork() + if not pid: + # Child process. + exitval = 127 + try: + os.execvpe(l[0], l, env) + except OSError, e: + exitval = exitvalmap.get(e[0], e[0]) + sys.stderr.write("scons: %s: %s\n" % (l[0], e[1])) + os._exit(exitval) + else: + # Parent process. + pid, stat = os.waitpid(pid, 0) + if stat & 0xff: + return stat | 0x80 + return stat >> 8 + +def _get_env_command(sh, escape, cmd, args, env): + s = string.join(args) + if env: + l = ['env', '-'] + \ + map(lambda t, e=escape: e(t[0])+'='+e(t[1]), env.items()) + \ + [sh, '-c', escape(s)] + s = string.join(l) + return s + +def env_spawn(sh, escape, cmd, args, env): + return exec_system([_get_env_command( sh, escape, cmd, args, env)], env) + +def spawnvpe_spawn(sh, escape, cmd, args, env): + return exec_spawnvpe([sh, '-c', string.join(args)], env) + +def fork_spawn(sh, escape, cmd, args, env): + return exec_fork([sh, '-c', string.join(args)], env) + +def process_cmd_output(cmd_stdout, cmd_stderr, stdout, stderr): + stdout_eof = stderr_eof = 0 + while not (stdout_eof and stderr_eof): + try: + (i,o,e) = select.select([cmd_stdout, cmd_stderr], [], []) + if cmd_stdout in i: + str = cmd_stdout.read() + if len(str) == 0: + stdout_eof = 1 + elif stdout is not None: + stdout.write(str) + if cmd_stderr in i: + str = cmd_stderr.read() + if len(str) == 0: + #sys.__stderr__.write( "stderr_eof=1\n" ) + stderr_eof = 1 + else: + #sys.__stderr__.write( "str(stderr) = %s\n" % str ) + stderr.write(str) + except select.error, (_errno, _strerror): + if _errno != errno.EINTR: + raise + +def exec_popen3(l, env, stdout, stderr): + proc = subprocess.Popen(string.join(l), + stdout=stdout, + stderr=stderr, + shell=True) + stat = proc.wait() + if stat & 0xff: + return stat | 0x80 + return stat >> 8 + +def exec_piped_fork(l, env, stdout, stderr): + # spawn using fork / exec and providing a pipe for the command's + # stdout / stderr stream + if stdout != stderr: + (rFdOut, wFdOut) = os.pipe() + (rFdErr, wFdErr) = os.pipe() + else: + (rFdOut, wFdOut) = os.pipe() + rFdErr = rFdOut + wFdErr = wFdOut + # do the fork + pid = os.fork() + if not pid: + # Child process + os.close( rFdOut ) + if rFdOut != rFdErr: + os.close( rFdErr ) + os.dup2( wFdOut, 1 ) # is there some symbolic way to do that ? + os.dup2( wFdErr, 2 ) + os.close( wFdOut ) + if stdout != stderr: + os.close( wFdErr ) + exitval = 127 + try: + os.execvpe(l[0], l, env) + except OSError, e: + exitval = exitvalmap.get(e[0], e[0]) + stderr.write("scons: %s: %s\n" % (l[0], e[1])) + os._exit(exitval) + else: + # Parent process + pid, stat = os.waitpid(pid, 0) + os.close( wFdOut ) + if stdout != stderr: + os.close( wFdErr ) + childOut = os.fdopen( rFdOut ) + if stdout != stderr: + childErr = os.fdopen( rFdErr ) + else: + childErr = childOut + process_cmd_output(childOut, childErr, stdout, stderr) + os.close( rFdOut ) + if stdout != stderr: + os.close( rFdErr ) + if stat & 0xff: + return stat | 0x80 + return stat >> 8 + +def piped_env_spawn(sh, escape, cmd, args, env, stdout, stderr): + # spawn using Popen3 combined with the env command + # the command name and the command's stdout is written to stdout + # the command's stderr is written to stderr + return exec_popen3([_get_env_command(sh, escape, cmd, args, env)], + env, stdout, stderr) + +def piped_fork_spawn(sh, escape, cmd, args, env, stdout, stderr): + # spawn using fork / exec and providing a pipe for the command's + # stdout / stderr stream + return exec_piped_fork([sh, '-c', string.join(args)], + env, stdout, stderr) + + + +def generate(env): + # If os.spawnvpe() exists, we use it to spawn commands. Otherwise + # if the env utility exists, we use os.system() to spawn commands, + # finally we fall back on os.fork()/os.exec(). + # + # os.spawnvpe() is prefered because it is the most efficient. But + # for Python versions without it, os.system() is prefered because it + # is claimed that it works better with threads (i.e. -j) and is more + # efficient than forking Python. + # + # NB: Other people on the scons-users mailing list have claimed that + # os.fork()/os.exec() works better than os.system(). There may just + # not be a default that works best for all users. + + if os.__dict__.has_key('spawnvpe'): + spawn = spawnvpe_spawn + elif env.Detect('env'): + spawn = env_spawn + else: + spawn = fork_spawn + + if env.Detect('env'): + pspawn = piped_env_spawn + else: + pspawn = piped_fork_spawn + + if not env.has_key('ENV'): + env['ENV'] = {} + env['ENV']['PATH'] = '/usr/local/bin:/opt/bin:/bin:/usr/bin' + env['OBJPREFIX'] = '' + env['OBJSUFFIX'] = '.o' + env['SHOBJPREFIX'] = '$OBJPREFIX' + env['SHOBJSUFFIX'] = '$OBJSUFFIX' + env['PROGPREFIX'] = '' + env['PROGSUFFIX'] = '' + env['LIBPREFIX'] = 'lib' + env['LIBSUFFIX'] = '.a' + env['SHLIBPREFIX'] = '$LIBPREFIX' + env['SHLIBSUFFIX'] = '.so' + env['LIBPREFIXES'] = [ '$LIBPREFIX' ] + env['LIBSUFFIXES'] = [ '$LIBSUFFIX', '$SHLIBSUFFIX' ] + env['PSPAWN'] = pspawn + env['SPAWN'] = spawn + env['SHELL'] = 'sh' + env['ESCAPE'] = escape + env['TEMPFILE'] = TempFileMunge + env['TEMPFILEPREFIX'] = '@' + #Based on LINUX: ARG_MAX=ARG_MAX=131072 - 3000 for environment expansion + #Note: specific platforms might rise or lower this value + env['MAXLINELENGTH'] = 128072 + + # This platform supports RPATH specifications. + env['__RPATH'] = '$_RPATH' + +# Local Variables: +# tab-width:4 +# indent-tabs-mode:nil +# End: +# vim: set expandtab tabstop=4 shiftwidth=4: |