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84e2963f8e
This will facilitate breaking up Nix into multiple packages for each component with Meson.
37 lines
1 KiB
C++
37 lines
1 KiB
C++
#include "child.hh"
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#include "current-process.hh"
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#include "logging.hh"
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#include <fcntl.h>
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#include <unistd.h>
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namespace nix {
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void commonChildInit()
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{
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logger = makeSimpleLogger();
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const static std::string pathNullDevice = "/dev/null";
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restoreProcessContext(false);
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/* Put the child in a separate session (and thus a separate
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process group) so that it has no controlling terminal (meaning
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that e.g. ssh cannot open /dev/tty) and it doesn't receive
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terminal signals. */
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if (setsid() == -1)
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throw SysError("creating a new session");
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/* Dup stderr to stdout. */
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if (dup2(STDERR_FILENO, STDOUT_FILENO) == -1)
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throw SysError("cannot dup stderr into stdout");
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/* Reroute stdin to /dev/null. */
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int fdDevNull = open(pathNullDevice.c_str(), O_RDWR);
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if (fdDevNull == -1)
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throw SysError("cannot open '%1%'", pathNullDevice);
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if (dup2(fdDevNull, STDIN_FILENO) == -1)
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throw SysError("cannot dup null device into stdin");
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close(fdDevNull);
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}
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}
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