From 3c92ea399d717dc45b3fa91424c0dadc0239ebf2 Mon Sep 17 00:00:00 2001 From: Eelco Dolstra Date: Sat, 2 Aug 2008 12:54:35 +0000 Subject: * Make nix-env --dry-run print the paths to be substituted correctly again. (After the previous substituter mechanism refactoring I didn't update the code that obtains the references of substitutable paths.) This required some refactoring: the substituter programs are now kept running and receive/respond to info requests via stdin/stdout. --- src/libutil/util.cc | 22 ++++++++++++++++++++-- 1 file changed, 20 insertions(+), 2 deletions(-) (limited to 'src/libutil/util.cc') diff --git a/src/libutil/util.cc b/src/libutil/util.cc index 4f6c367da..c28f4e1bb 100644 --- a/src/libutil/util.cc +++ b/src/libutil/util.cc @@ -579,7 +579,14 @@ AutoCloseFD::AutoCloseFD(int fd) AutoCloseFD::AutoCloseFD(const AutoCloseFD & fd) { - abort(); + /* Copying a AutoCloseFD isn't allowed (who should get to close + it?). But as a edge case, allow copying of closed + AutoCloseFDs. This is necessary due to tiresome reasons + involving copy constructor use on default object values in STL + containers (like when you do `map[value]' where value isn't in + the map yet). */ + this->fd = fd.fd; + if (this->fd != -1) abort(); } @@ -832,7 +839,7 @@ string runProgram(Path program, bool searchPath, const Strings & args) pipe.readSide.close(); if (dup2(pipe.writeSide, STDOUT_FILENO) == -1) - throw SysError("dupping from-hook write side"); + throw SysError("dupping stdout"); std::vector cargs; /* careful with c_str()! */ cargs.push_back(program.c_str()); @@ -868,6 +875,17 @@ string runProgram(Path program, bool searchPath, const Strings & args) } +void closeMostFDs(const set & exceptions) +{ + int maxFD = 0; + maxFD = sysconf(_SC_OPEN_MAX); + for (int fd = 0; fd < maxFD; ++fd) + if (fd != STDIN_FILENO && fd != STDOUT_FILENO && fd != STDERR_FILENO + && exceptions.find(fd) == exceptions.end()) + close(fd); /* ignore result */ +} + + void quickExit(int status) { #ifdef __CYGWIN__ -- cgit v1.2.3