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Restore affinity

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This commit is contained in:
Eelco Dolstra 2013-09-06 21:00:36 +02:00
parent 0abdf4beaa
commit c6f2b89c0e
2 changed files with 28 additions and 8 deletions
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3
default.nix
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@ -4,7 +4,8 @@ runCommand "nix-repl"
{ buildInputs = [ readline nixUnstable boehmgc ]; } { buildInputs = [ readline nixUnstable boehmgc ]; }
'' ''
mkdir -p $out/bin mkdir -p $out/bin
g++ -O3 -Wall -o $out/bin/nix-repl ${./nix-repl.cc} \ g++ -O3 -Wall -std=c++0x \
-o $out/bin/nix-repl ${./nix-repl.cc} \
-I${nixUnstable}/include/nix -L${nixUnstable}/lib/nix \ -I${nixUnstable}/include/nix -L${nixUnstable}/lib/nix \
-lexpr -lmain -lreadline -lgc -lexpr -lmain -lreadline -lgc
'' ''

33
nix-repl.cc
View file

@ -13,6 +13,7 @@
#include "common-opts.hh" #include "common-opts.hh"
#include "get-drvs.hh" #include "get-drvs.hh"
#include "derivations.hh" #include "derivations.hh"
#include "affinity.hh"
using namespace std; using namespace std;
using namespace nix; using namespace nix;
@ -187,6 +188,27 @@ void NixRepl::completePrefix(string prefix)
} }
static int runProgram(const string & program, const Strings & args)
{
std::vector<const char *> cargs; /* careful with c_str()! */
cargs.push_back(program.c_str());
for (Strings::const_iterator i = args.begin(); i != args.end(); ++i)
cargs.push_back(i->c_str());
cargs.push_back(0);
Pid pid;
pid = fork();
if (pid == -1) throw SysError("forking");
if (pid == 0) {
restoreAffinity();
execvp(program.c_str(), (char * *) &cargs[0]);
_exit(1);
}
return pid.wait(true);
}
void NixRepl::processLine(string line) void NixRepl::processLine(string line)
{ {
if (line == "") return; if (line == "") return;
@ -224,16 +246,13 @@ void NixRepl::processLine(string line)
/* We could do the build in this process using buildPaths(), /* We could do the build in this process using buildPaths(),
but doing it in a child makes it easier to recover from but doing it in a child makes it easier to recover from
problems / SIGINT. */ problems / SIGINT. */
if (system(("nix-store -r " + drvPath + " > /dev/null").c_str()) == -1) if (runProgram("nix-store", Strings{"-r", drvPath}) != 0) return;
throw SysError("starting nix-store");
Derivation drv = parseDerivation(readFile(drvPath)); Derivation drv = parseDerivation(readFile(drvPath));
std::cout << "this derivation produced the following outputs:" << std::endl; std::cout << std::endl << "this derivation produced the following outputs:" << std::endl;
foreach (DerivationOutputs::iterator, i, drv.outputs) foreach (DerivationOutputs::iterator, i, drv.outputs)
std::cout << format(" %1% -> %2%") % i->first % i->second.path << std::endl; std::cout << format(" %1% -> %2%") % i->first % i->second.path << std::endl;
} else { } else
if (system(("nix-shell " + drvPath).c_str()) == -1) runProgram("nix-shell", Strings{drvPath});
throw SysError("starting nix-shell");
}
} }
else if (string(line, 0, 1) == ":") else if (string(line, 0, 1) == ":")