1 //===- llvm/System/Unix/Program.cpp -----------------------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by Reid Spencer and is distributed under the
6 // University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the Unix specific portion of the Program class.
12 //===----------------------------------------------------------------------===//
14 //===----------------------------------------------------------------------===//
15 //=== WARNING: Implementation here must contain only generic UNIX code that
16 //=== is guaranteed to work on *all* UNIX variants.
17 //===----------------------------------------------------------------------===//
22 #include <Config/config.h>
23 #ifdef HAVE_SYS_WAIT_H
30 // This function just uses the PATH environment variable to find the program.
32 Program::FindProgramByName(const std::string& progName) {
34 // Check some degenerate cases
35 if (progName.length() == 0) // no program
38 if (!temp.set_file(progName)) // invalid name
40 if (temp.executable()) // already executable as is
43 // At this point, the file name is valid and its not executable
45 // Get the path. If its empty, we can't do anything to find it.
46 const char *PathStr = getenv("PATH");
50 // Now we have a colon separated list of directories to search; try them.
51 unsigned PathLen = strlen(PathStr);
53 // Find the first colon...
54 const char *Colon = std::find(PathStr, PathStr+PathLen, ':');
56 // Check to see if this first directory contains the executable...
58 if (FilePath.set_directory(std::string(PathStr,Colon))) {
59 FilePath.append_file(progName);
60 if (FilePath.executable())
61 return FilePath; // Found the executable!
64 // Nope it wasn't in this directory, check the next path in the list!
65 PathLen -= Colon-PathStr;
68 // Advance past duplicate colons
69 while (*PathStr == ':') {
79 Program::ExecuteAndWait(const std::vector<std::string>& args) const {
81 throw get() + " is not executable";
83 #ifdef HAVE_SYS_WAIT_H
84 // Create local versions of the parameters that can be passed into execve()
85 // without creating const problems.
86 const char* argv[ args.size() + 2 ];
88 std::string progname(this->getLast());
89 argv[index++] = progname.c_str();
90 for (unsigned i = 0; i < args.size(); i++)
91 argv[index++] = args[i].c_str();
94 // Create a child process.
96 // An error occured: Return to the caller.
98 ThrowErrno(std::string("Couldn't execute program '") + get() + "'");
101 // Child process: Execute the program.
103 execve (get().c_str(), (char** const)argv, environ);
104 // If the execve() failed, we should exit and let the parent pick up
105 // our non-zero exit status.
108 // Parent process: Break out of the switch to do our processing.
113 // Parent process: Wait for the child process to terminate.
115 if ((::wait (&status)) == -1)
116 ThrowErrno(std::string("Failed waiting for program '") + get() + "'");
118 // If the program exited normally with a zero exit status, return success!
119 if (WIFEXITED (status))
120 return WEXITSTATUS(status);
121 else if (WIFSIGNALED(status))
122 throw std::string("Program '") + get() + "' received terminating signal.";
127 throw std::string("Program::ExecuteAndWait not implemented on this platform!\n");
133 // vim: sw=2 smartindent smarttab tw=80 autoindent expandtab