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Make I/O redirection handling in sys::Program a bit more consistent. No

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functional changes. Win32 code is untested, but should work fine.

In the unix variant, rename RedirectFD to RedirectIO and let that function
handle empty and null paths instead of doing that in the caller 3 times. This
is the same as win32 already does it.

In the win32 variant, use Path::isEmpty() instead of checking the resulting
c_str() manually. This is the same as unix already does it.

llvm-svn: 52230
This commit is contained in:
Matthijs Kooijman 2008-06-12 10:47:18 +00:00
parent e52bc54496
commit f2d854e34b
2 changed files with 18 additions and 24 deletions
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34
lib/System/Unix/Program.inc
View File

@ -84,8 +84,16 @@ Program::FindProgramByName(const std::string& progName) {
return Path();
}
static bool RedirectFD(const std::string &File, int FD, std::string* ErrMsg) {
if (File.empty()) return false; // Noop
static bool RedirectIO(const Path *Path, int FD, std::string* ErrMsg) {
if (Path == 0)
// Noop
return false;
std::string File;
if (Path->isEmpty())
// Redirect empty paths to /dev/null
File = "/dev/null";
else
File = Path->toString();
// Open the file
int InFD = open(File.c_str(), FD == 0 ? O_RDONLY : O_WRONLY|O_CREAT, 0666);
@ -162,27 +170,11 @@ Program::ExecuteAndWait(const Path& path,
case 0: {
// Redirect file descriptors...
if (redirects) {
if (redirects[0]) {
if (redirects[0]->isEmpty()) {
if (RedirectFD("/dev/null",0,ErrMsg)) { return -1; }
} else {
if (RedirectFD(redirects[0]->toString(), 0,ErrMsg)) { return -1; }
}
}
if (redirects[1]) {
if (redirects[1]->isEmpty()) {
if (RedirectFD("/dev/null",1,ErrMsg)) { return -1; }
} else {
if (RedirectFD(redirects[1]->toString(),1,ErrMsg)) { return -1; }
}
}
if (RedirectIO(redirects[0], 0, ErrMsg)) { return -1; }
if (RedirectIO(redirects[1], 1, ErrMsg)) { return -1; }
if (redirects[1] && redirects[2] &&
*(redirects[1]) != *(redirects[2])) {
if (redirects[2]->isEmpty()) {
if (RedirectFD("/dev/null",2,ErrMsg)) { return -1; }
} else {
if (RedirectFD(redirects[2]->toString(), 2,ErrMsg)) { return -1; }
}
if (RedirectIO(redirects[2], 2, ErrMsg)) { return -1; }
} else if (-1 == dup2(1,2)) {
MakeErrMsg(ErrMsg, "Can't redirect");
return -1;

6
lib/System/Win32/Program.inc
View File

@ -78,9 +78,11 @@ static HANDLE RedirectIO(const Path *path, int fd, std::string* ErrMsg) {
return h;
}
const char *fname = path->toString().c_str();
if (*fname == 0)
const char *fname;
if (path->isEmpty())
fname = "NUL";
else
fname = path->toString().c_str();
SECURITY_ATTRIBUTES sa;
sa.nLength = sizeof(sa);