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In ExecWait(), made the child process exit if it can't execve() the new

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program.
Added the use of const (which compiles and is hopefully correct).
Added comments.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@8585 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
John Criswell 2003-09-17 19:02:49 +00:00
parent f1d01fb6a4
commit e5b3e1559b
4 changed files with 48 additions and 28 deletions
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2
include/Support/SystemUtils.h
View File

@ -41,5 +41,5 @@ int RunProgramWithTimeout(const std::string &ProgramPath, const char **Args,
/// Execute a program with the given arguments and environment and
/// wait for it to terminate.
///
int ExecWait (char ** argv, char ** envp);
int ExecWait (const char * const argv[], const char * const envp[]);
#endif

2
include/llvm/Support/SystemUtils.h
View File

@ -41,5 +41,5 @@ int RunProgramWithTimeout(const std::string &ProgramPath, const char **Args,
/// Execute a program with the given arguments and environment and
/// wait for it to terminate.
///
int ExecWait (char ** argv, char ** envp);
int ExecWait (const char * const argv[], const char * const envp[]);
#endif

36
lib/Support/SystemUtils.cpp
View File

@ -192,8 +192,10 @@ int RunProgramWithTimeout(const std::string &ProgramPath, const char **Args,
// a generic library function. The caller or executed program should report
// errors in the way it sees fit.
//
// This function does not use $PATH to find programs.
//
int
ExecWait (char ** argv, char **envp)
ExecWait (const char * const old_argv[], const char * const old_envp[])
{
// Child process ID
register int child;
@ -202,32 +204,40 @@ ExecWait (char ** argv, char **envp)
int status;
//
// Because UNIX is sometimes less than convenient, we need to use
// FindExecutable() to find the full pathname to the file to execute.
// Create local versions of the parameters that can be passed into execve()
// without creating const problems.
//
// This is becausse execvp() doesn't use PATH, and we want to look for
// programs in the LLVM binary directory first anyway.
//
std::string Program = FindExecutable (argv[0], "");
if (Program.empty())
{
return 1;
}
char ** const argv = (char ** const) old_argv;
char ** const envp = (char ** const) old_envp;
//
// Create a child process.
//
switch (child=fork())
{
//
// An error occured: Return to the caller.
//
case -1:
return 1;
break;
//
// Child process: Execute the program.
//
case 0:
execve (Program.c_str(), argv, envp);
return 1;
execve (argv[0], argv, envp);
//
// If the execve() failed, we should exit and let the parent pick up
// our non-zero exit status.
//
exit (1);
break;
//
// Parent process: Break out of the switch to do our processing.
//
default:
break;
}

36
support/lib/Support/SystemUtils.cpp
View File

@ -192,8 +192,10 @@ int RunProgramWithTimeout(const std::string &ProgramPath, const char **Args,
// a generic library function. The caller or executed program should report
// errors in the way it sees fit.
//
// This function does not use $PATH to find programs.
//
int
ExecWait (char ** argv, char **envp)
ExecWait (const char * const old_argv[], const char * const old_envp[])
{
// Child process ID
register int child;
@ -202,32 +204,40 @@ ExecWait (char ** argv, char **envp)
int status;
//
// Because UNIX is sometimes less than convenient, we need to use
// FindExecutable() to find the full pathname to the file to execute.
// Create local versions of the parameters that can be passed into execve()
// without creating const problems.
//
// This is becausse execvp() doesn't use PATH, and we want to look for
// programs in the LLVM binary directory first anyway.
//
std::string Program = FindExecutable (argv[0], "");
if (Program.empty())
{
return 1;
}
char ** const argv = (char ** const) old_argv;
char ** const envp = (char ** const) old_envp;
//
// Create a child process.
//
switch (child=fork())
{
//
// An error occured: Return to the caller.
//
case -1:
return 1;
break;
//
// Child process: Execute the program.
//
case 0:
execve (Program.c_str(), argv, envp);
return 1;
execve (argv[0], argv, envp);
//
// If the execve() failed, we should exit and let the parent pick up
// our non-zero exit status.
//
exit (1);
break;
//
// Parent process: Break out of the switch to do our processing.
//
default:
break;
}