263 lines
8.5 KiB
Python
263 lines
8.5 KiB
Python
"""SCons.Platform.posix
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Platform-specific initialization for POSIX (Linux, UNIX, etc.) systems.
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There normally shouldn't be any need to import this module directly. It
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will usually be imported through the generic SCons.Platform.Platform()
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selection method.
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"""
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#
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# Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 The SCons Foundation
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#
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# Permission is hereby granted, free of charge, to any person obtaining
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# a copy of this software and associated documentation files (the
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# "Software"), to deal in the Software without restriction, including
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# without limitation the rights to use, copy, modify, merge, publish,
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# distribute, sublicense, and/or sell copies of the Software, and to
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# permit persons to whom the Software is furnished to do so, subject to
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# the following conditions:
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#
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# The above copyright notice and this permission notice shall be included
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# in all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
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# KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
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# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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#
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__revision__ = "src/engine/SCons/Platform/posix.py issue-2856:2676:d23b7a2f45e8 2012/08/05 15:38:28 garyo"
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import errno
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import os
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import os.path
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import subprocess
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import sys
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import select
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import SCons.Util
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from SCons.Platform import TempFileMunge
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exitvalmap = {
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2 : 127,
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13 : 126,
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}
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def escape(arg):
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"escape shell special characters"
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slash = '\\'
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special = '"$()'
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arg = arg.replace(slash, slash+slash)
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for c in special:
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arg = arg.replace(c, slash+c)
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return '"' + arg + '"'
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def exec_system(l, env):
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stat = os.system(' '.join(l))
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if stat & 0xff:
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return stat | 0x80
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return stat >> 8
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def exec_spawnvpe(l, env):
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stat = os.spawnvpe(os.P_WAIT, l[0], l, env)
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# os.spawnvpe() returns the actual exit code, not the encoding
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# returned by os.waitpid() or os.system().
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return stat
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def exec_fork(l, env):
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pid = os.fork()
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if not pid:
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# Child process.
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exitval = 127
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try:
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os.execvpe(l[0], l, env)
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except OSError, e:
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exitval = exitvalmap.get(e[0], e[0])
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sys.stderr.write("scons: %s: %s\n" % (l[0], e[1]))
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os._exit(exitval)
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else:
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# Parent process.
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pid, stat = os.waitpid(pid, 0)
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if stat & 0xff:
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return stat | 0x80
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return stat >> 8
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def _get_env_command(sh, escape, cmd, args, env):
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s = ' '.join(args)
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if env:
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l = ['env', '-'] + \
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[escape(t[0])+'='+escape(t[1]) for t in env.items()] + \
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[sh, '-c', escape(s)]
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s = ' '.join(l)
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return s
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def env_spawn(sh, escape, cmd, args, env):
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return exec_system([_get_env_command( sh, escape, cmd, args, env)], env)
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def spawnvpe_spawn(sh, escape, cmd, args, env):
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return exec_spawnvpe([sh, '-c', ' '.join(args)], env)
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def fork_spawn(sh, escape, cmd, args, env):
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return exec_fork([sh, '-c', ' '.join(args)], env)
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def process_cmd_output(cmd_stdout, cmd_stderr, stdout, stderr):
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stdout_eof = stderr_eof = 0
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while not (stdout_eof and stderr_eof):
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try:
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(i,o,e) = select.select([cmd_stdout, cmd_stderr], [], [])
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if cmd_stdout in i:
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str = cmd_stdout.read()
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if len(str) == 0:
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stdout_eof = 1
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elif stdout is not None:
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stdout.write(str)
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if cmd_stderr in i:
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str = cmd_stderr.read()
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if len(str) == 0:
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#sys.__stderr__.write( "stderr_eof=1\n" )
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stderr_eof = 1
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else:
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#sys.__stderr__.write( "str(stderr) = %s\n" % str )
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stderr.write(str)
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except select.error, (_errno, _strerror):
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if _errno != errno.EINTR:
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raise
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def exec_popen3(l, env, stdout, stderr):
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proc = subprocess.Popen(' '.join(l),
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stdout=stdout,
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stderr=stderr,
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shell=True)
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stat = proc.wait()
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if stat & 0xff:
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return stat | 0x80
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return stat >> 8
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def exec_piped_fork(l, env, stdout, stderr):
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# spawn using fork / exec and providing a pipe for the command's
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# stdout / stderr stream
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if stdout != stderr:
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(rFdOut, wFdOut) = os.pipe()
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(rFdErr, wFdErr) = os.pipe()
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else:
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(rFdOut, wFdOut) = os.pipe()
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rFdErr = rFdOut
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wFdErr = wFdOut
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# do the fork
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pid = os.fork()
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if not pid:
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# Child process
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os.close( rFdOut )
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if rFdOut != rFdErr:
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os.close( rFdErr )
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os.dup2( wFdOut, 1 ) # is there some symbolic way to do that ?
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os.dup2( wFdErr, 2 )
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os.close( wFdOut )
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if stdout != stderr:
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os.close( wFdErr )
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exitval = 127
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try:
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os.execvpe(l[0], l, env)
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except OSError, e:
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exitval = exitvalmap.get(e[0], e[0])
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stderr.write("scons: %s: %s\n" % (l[0], e[1]))
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os._exit(exitval)
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else:
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# Parent process
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pid, stat = os.waitpid(pid, 0)
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os.close( wFdOut )
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if stdout != stderr:
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os.close( wFdErr )
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childOut = os.fdopen( rFdOut )
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if stdout != stderr:
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childErr = os.fdopen( rFdErr )
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else:
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childErr = childOut
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process_cmd_output(childOut, childErr, stdout, stderr)
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os.close( rFdOut )
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if stdout != stderr:
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os.close( rFdErr )
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if stat & 0xff:
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return stat | 0x80
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return stat >> 8
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def piped_env_spawn(sh, escape, cmd, args, env, stdout, stderr):
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# spawn using Popen3 combined with the env command
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# the command name and the command's stdout is written to stdout
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# the command's stderr is written to stderr
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return exec_popen3([_get_env_command(sh, escape, cmd, args, env)],
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env, stdout, stderr)
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def piped_fork_spawn(sh, escape, cmd, args, env, stdout, stderr):
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# spawn using fork / exec and providing a pipe for the command's
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# stdout / stderr stream
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return exec_piped_fork([sh, '-c', ' '.join(args)],
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env, stdout, stderr)
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def generate(env):
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# If os.spawnvpe() exists, we use it to spawn commands. Otherwise
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# if the env utility exists, we use os.system() to spawn commands,
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# finally we fall back on os.fork()/os.exec().
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#
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# os.spawnvpe() is prefered because it is the most efficient. But
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# for Python versions without it, os.system() is prefered because it
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# is claimed that it works better with threads (i.e. -j) and is more
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# efficient than forking Python.
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#
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# NB: Other people on the scons-users mailing list have claimed that
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# os.fork()/os.exec() works better than os.system(). There may just
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# not be a default that works best for all users.
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if 'spawnvpe' in os.__dict__:
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spawn = spawnvpe_spawn
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elif env.Detect('env'):
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spawn = env_spawn
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else:
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spawn = fork_spawn
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if env.Detect('env'):
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pspawn = piped_env_spawn
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else:
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pspawn = piped_fork_spawn
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if 'ENV' not in env:
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env['ENV'] = {}
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env['ENV']['PATH'] = '/usr/local/bin:/opt/bin:/bin:/usr/bin'
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env['OBJPREFIX'] = ''
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env['OBJSUFFIX'] = '.o'
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env['SHOBJPREFIX'] = '$OBJPREFIX'
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env['SHOBJSUFFIX'] = '$OBJSUFFIX'
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env['PROGPREFIX'] = ''
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env['PROGSUFFIX'] = ''
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env['LIBPREFIX'] = 'lib'
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env['LIBSUFFIX'] = '.a'
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env['SHLIBPREFIX'] = '$LIBPREFIX'
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env['SHLIBSUFFIX'] = '.so'
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env['LIBPREFIXES'] = [ '$LIBPREFIX' ]
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env['LIBSUFFIXES'] = [ '$LIBSUFFIX', '$SHLIBSUFFIX' ]
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env['PSPAWN'] = pspawn
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env['SPAWN'] = spawn
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env['SHELL'] = 'sh'
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env['ESCAPE'] = escape
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env['TEMPFILE'] = TempFileMunge
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env['TEMPFILEPREFIX'] = '@'
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#Based on LINUX: ARG_MAX=ARG_MAX=131072 - 3000 for environment expansion
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#Note: specific platforms might rise or lower this value
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env['MAXLINELENGTH'] = 128072
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# This platform supports RPATH specifications.
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env['__RPATH'] = '$_RPATH'
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# Local Variables:
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# tab-width:4
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# indent-tabs-mode:nil
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# End:
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# vim: set expandtab tabstop=4 shiftwidth=4:
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