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BUG: Foam::system command swallows first argument (fixes #901)

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This commit is contained in:
Mark Olesen
2018-06-22 15:18:41 +02:00
parent 6390c18381
commit c8fd217e95
6 changed files with 22 additions and 73 deletions
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79
src/OSspecific/POSIX/POSIX.C
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@ -1408,7 +1408,7 @@ int Foam::system(const std::string& command, const bool bg)
reinterpret_cast<char*>(0)
);
// obviously failed, since exec should not return at all
// Obviously failed, since exec should not return
FatalErrorInFunction
<< "exec failed: " << command
<< exit(FatalError);
@ -1426,9 +1426,7 @@ int Foam::system(const std::string& command, const bool bg)
int Foam::system(const CStringList& command, const bool bg)
{
const int argc = command.size();
if (!argc)
if (command.empty())
{
// Treat an empty command as a successful no-op.
// For consistency with POSIX (man sh) behaviour for (sh -c command),
@ -1459,14 +1457,10 @@ int Foam::system(const CStringList& command, const bool bg)
// Close or redirect file descriptors
redirects();
// execvp searches the path, uses the current environ
(void) ::execvp(command[0], command.strings());
// Need command and arguments separately.
// args is a nullptr-terminated list of c-strings
// execvp uses the current environ
(void) ::execvp(command[0], command.strings(1));
// obviously failed, since exec should not return at all
// Obviously failed, since exec should not return
FatalErrorInFunction
<< "exec(" << command[0] << ", ...) failed"
<< exit(FatalError);
@ -1484,70 +1478,15 @@ int Foam::system(const CStringList& command, const bool bg)
int Foam::system(const Foam::UList<Foam::string>& command, const bool bg)
{
// In the future simply call the CStringList version:
//
// const CStringList cmd(command);
// return Foam::system(cmd, bg);
const int argc = command.size();
if (!argc)
if (command.empty())
{
// Treat an empty command as a successful no-op.
// For consistency with POSIX (man sh) behaviour for (sh -c command),
// which is what is mostly being replicated here.
return 0;
}
// NB: use vfork, not fork!
// vfork behaves more like a thread and avoids copy-on-write problems
// triggered by fork.
// The normal system() command has a fork buried in it that causes
// issues with infiniband and openmpi etc.
const pid_t child_pid = ::vfork();
if (child_pid == -1)
{
FatalErrorInFunction
<< "vfork() failed for system command " << command[0]
<< exit(FatalError);
return -1; // fallback error value
}
else if (child_pid == 0)
{
// In child
// Close or redirect file descriptors
redirects();
// Need command and arguments separately.
// args is a nullptr-terminated list of c-strings
CStringList args(SubList<string>(command, 0));
if (argc > 1)
{
args.reset(SubList<string>(command, argc-1, 1));
}
// execvp uses the current environ
(void) ::execvp(command[0].c_str(), args.strings());
// obviously failed, since exec should not return at all
FatalErrorInFunction
<< "exec(" << command[0] << ", ...) failed"
<< exit(FatalError);
return -1; // fallback error value
}
// In parent
// - started as background process, or blocking wait for the child
return (bg ? 0 : waitpid(child_pid));
// Make a deep copy as C-strings
const CStringList cmd(command);
return Foam::system(cmd, bg);
}