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Added the ExecWait() function. It executes a program with the specified

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arguments and environment.
Perhaps it should be merged with the RunProgramWithTimeout function, but I'd
want to allow it to inherit the parent process's stdin and stdout.
I'll save that for a rainy day...


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@8577 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
John Criswell 2003-09-17 15:13:59 +00:00
parent 35f474acd6
commit 5afb5f6377
2 changed files with 196 additions and 0 deletions
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98
lib/Support/SystemUtils.cpp
View File

@ -156,3 +156,101 @@ int RunProgramWithTimeout(const std::string &ProgramPath, const char **Args,
}
return Status;
}
//
// Function: ExecWait ()
//
// Description:
// This function executes a program with the specified arguments and
// environment. It then waits for the progarm to termiante and then returns
// to the caller.
//
// Inputs:
// argv - The arguments to the program as an array of C strings. The first
// argument should be the name of the program to execute, and the
// last argument should be a pointer to NULL.
//
// envp - The environment passes to the program as an array of C strings in
// the form of "name=value" pairs. The last element should be a
// pointer to NULL.
//
// Outputs:
// None.
//
// Return value:
// 0 - No errors.
// 1 - The program could not be executed.
// 1 - The program returned a non-zero exit status.
// 1 - The program terminated abnormally.
//
// Notes:
// The program will inherit the stdin, stdout, and stderr file descriptors
// as well as other various configuration settings (umask).
//
// This function should not print anything to stdout/stderr on its own. It is
// a generic library function. The caller or executed program should report
// errors in the way it sees fit.
//
int
ExecWait (char ** argv, char **envp)
{
// Child process ID
register int child;
// Status from child process when it exits
int status;
//
// Because UNIX is sometimes less than convenient, we need to use
// FindExecutable() to find the full pathname to the file to execute.
//
// 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;
}
//
// Create a child process.
//
switch (child=fork())
{
case -1:
return 1;
break;
case 0:
execve (Program.c_str(), argv, envp);
return 1;
break;
default:
break;
}
//
// Parent process: Wait for the child process to termiante.
//
if ((wait (&status)) == -1)
{
return 1;
}
//
// If the program exited normally with a zero exit status, return success!
//
if (WIFEXITED (status) && (WEXITSTATUS(status) == 0))
{
return 0;
}
//
// Otherwise, return failure.
//
return 1;
}

98
support/lib/Support/SystemUtils.cpp
View File

@ -156,3 +156,101 @@ int RunProgramWithTimeout(const std::string &ProgramPath, const char **Args,
}
return Status;
}
//
// Function: ExecWait ()
//
// Description:
// This function executes a program with the specified arguments and
// environment. It then waits for the progarm to termiante and then returns
// to the caller.
//
// Inputs:
// argv - The arguments to the program as an array of C strings. The first
// argument should be the name of the program to execute, and the
// last argument should be a pointer to NULL.
//
// envp - The environment passes to the program as an array of C strings in
// the form of "name=value" pairs. The last element should be a
// pointer to NULL.
//
// Outputs:
// None.
//
// Return value:
// 0 - No errors.
// 1 - The program could not be executed.
// 1 - The program returned a non-zero exit status.
// 1 - The program terminated abnormally.
//
// Notes:
// The program will inherit the stdin, stdout, and stderr file descriptors
// as well as other various configuration settings (umask).
//
// This function should not print anything to stdout/stderr on its own. It is
// a generic library function. The caller or executed program should report
// errors in the way it sees fit.
//
int
ExecWait (char ** argv, char **envp)
{
// Child process ID
register int child;
// Status from child process when it exits
int status;
//
// Because UNIX is sometimes less than convenient, we need to use
// FindExecutable() to find the full pathname to the file to execute.
//
// 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;
}
//
// Create a child process.
//
switch (child=fork())
{
case -1:
return 1;
break;
case 0:
execve (Program.c_str(), argv, envp);
return 1;
break;
default:
break;
}
//
// Parent process: Wait for the child process to termiante.
//
if ((wait (&status)) == -1)
{
return 1;
}
//
// If the program exited normally with a zero exit status, return success!
//
if (WIFEXITED (status) && (WEXITSTATUS(status) == 0))
{
return 0;
}
//
// Otherwise, return failure.
//
return 1;
}