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Handle SIGWINCH

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This commit is contained in:
Eelco Dolstra 2017-08-25 15:57:49 +02:00
parent ec9e0c03c3
commit db1d45037c
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GPG key ID: 8170B4726D7198DE
3 changed files with 39 additions and 8 deletions
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28
src/libutil/util.cc
View file

@ -17,6 +17,7 @@
#include <fcntl.h>
#include <limits.h>
#include <pwd.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
@ -1254,6 +1255,26 @@ void callFailure(const std::function<void(std::exception_ptr exc)> & failure, st
}
static Sync<std::pair<unsigned short, unsigned short>> windowSize{{0, 0}};
static void updateWindowSize()
{
struct winsize ws;
if (ioctl(1, TIOCGWINSZ, &ws) == 0) {
auto windowSize_(windowSize.lock());
windowSize_->first = ws.ws_row;
windowSize_->second = ws.ws_col;
}
}
std::pair<unsigned short, unsigned short> getWindowSize()
{
return *windowSize.lock();
}
static Sync<std::list<std::function<void()>>> _interruptCallbacks;
static void signalHandlerThread(sigset_t set)
@ -1264,6 +1285,10 @@ static void signalHandlerThread(sigset_t set)
if (signal == SIGINT || signal == SIGTERM || signal == SIGHUP)
triggerInterrupt();
else if (signal == SIGWINCH) {
updateWindowSize();
}
}
}
@ -1287,6 +1312,8 @@ static sigset_t savedSignalMask;
void startSignalHandlerThread()
{
updateWindowSize();
if (sigprocmask(SIG_BLOCK, nullptr, &savedSignalMask))
throw SysError("quering signal mask");
@ -1296,6 +1323,7 @@ void startSignalHandlerThread()
sigaddset(&set, SIGTERM);
sigaddset(&set, SIGHUP);
sigaddset(&set, SIGPIPE);
sigaddset(&set, SIGWINCH);
if (pthread_sigmask(SIG_BLOCK, &set, nullptr))
throw SysError("blocking signals");

10
src/libutil/util.hh
View file

@ -349,6 +349,12 @@ bool hasSuffix(const string & s, const string & suffix);
std::string toLower(const std::string & s);
/* Escape a string that contains octal-encoded escape codes such as
used in /etc/fstab and /proc/mounts (e.g. "foo\040bar" decodes to
"foo bar"). */
string decodeOctalEscaped(const string & s);
/* Exception handling in destructors: print an error message, then
ignore the exception. */
void ignoreException();
@ -470,4 +476,8 @@ struct MaintainCount
};
/* Return the number of rows and columns of the terminal. */
std::pair<unsigned short, unsigned short> getWindowSize();
}

9
src/nix/progress-bar.cc
View file

@ -6,8 +6,6 @@
#include <map>
#include <atomic>
#include <sys/ioctl.h>
namespace nix {
static std::string getS(const std::vector<Logger::Field> & fields, size_t n)
@ -99,15 +97,10 @@ private:
Sync<State> state_;
int width = 0;
public:
ProgressBar()
{
struct winsize ws;
if (ioctl(1, TIOCGWINSZ, &ws) == 0)
width = ws.ws_col;
}
~ProgressBar()
@ -270,7 +263,7 @@ public:
}
}
writeToStderr("\r" + ansiTruncate(line, width) + "\e[K");
writeToStderr("\r" + ansiTruncate(line, getWindowSize().second) + "\e[K");
}
std::string getStatus(State & state)