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40 #include "sighandler.h"
47 #include "gromacs/utility/enumerationhelpers.h"
48 #include "gromacs/utility/exceptions.h"
49 #include "gromacs/utility/fatalerror.h"
51 const char* enumValueToString(StopCondition enumValue)
53 constexpr gmx::EnumerationArray<StopCondition, const char*> stopConditionNames = {
54 "None", "Stop at the next neighbor search step", "Stop at the next step", "Abort"
56 return stopConditionNames[enumValue];
59 /* these do not neccesarily match the stop condition, but are
60 referred to in the signal handler. */
61 static const char* const gmx_signal_name[] = {
62 "None", "INT", "TERM", "second INT/TERM", "remote INT/TERM", "remote second INT/TERM",
66 // NOLINTNEXTLINE(cppcoreguidelines-avoid-non-const-global-variables)
67 static volatile StopCondition stop_condition = StopCondition::None;
68 // NOLINTNEXTLINE(cppcoreguidelines-avoid-non-const-global-variables)
69 static volatile sig_atomic_t last_signal_name = 0;
70 // NOLINTNEXTLINE(cppcoreguidelines-avoid-non-const-global-variables)
71 static volatile sig_atomic_t usr_condition = 0;
73 void gmx_reset_stop_condition()
75 stop_condition = StopCondition::None;
76 // last_signal_name and usr_condition are left untouched by reset.
79 static void signal_handler(int n)
83 /* windows doesn't do SIGINT correctly according to ANSI (yes, signals are in
84 ANSI C89, and windows spawns a thread specifically to run the INT signal
85 handler), but that doesn't matter for a simple signal handler like this. */
88 /* we explicitly set things up to allow this: */
89 switch (stop_condition)
91 case StopCondition::None: stop_condition = StopCondition::NextNS; break;
92 case StopCondition::NextNS: stop_condition = StopCondition::Next; break;
93 case StopCondition::Next: stop_condition = StopCondition::Abort; break;
94 default: GMX_THROW(gmx::InternalError("Stop condition increased beyond abort"));
102 last_signal_name = 2;
104 if (stop_condition == StopCondition::Next)
106 last_signal_name = 3;
108 if (stop_condition >= StopCondition::Abort)
114 case SIGUSR1: usr_condition = 1; break;
120 static void gmx_signal(int signum)
123 struct sigaction act;
124 act.sa_handler = signal_handler;
125 sigemptyset(&act.sa_mask);
126 act.sa_flags = SA_RESTART;
127 sigaction(signum, &act, nullptr);
129 signal(signum, signal_handler);
133 void signal_handler_install()
135 if (getenv("GMX_NO_TERM") == nullptr)
139 fprintf(debug, "Installing signal handler for SIGTERM\n");
143 if (getenv("GMX_NO_INT") == nullptr)
147 fprintf(debug, "Installing signal handler for SIGINT\n");
152 if (getenv("GMX_NO_USR1") == nullptr)
156 fprintf(debug, "Installing signal handler for SIGUSR1\n");
163 StopCondition gmx_get_stop_condition()
165 return stop_condition;
168 void gmx_set_stop_condition(StopCondition recvd_stop_cond)
170 if (recvd_stop_cond > stop_condition)
172 stop_condition = recvd_stop_cond;
173 if (stop_condition == StopCondition::NextNS)
175 last_signal_name = 4;
177 if (stop_condition == StopCondition::Next)
179 last_signal_name = 5;
184 const char* gmx_get_signal_name()
186 return gmx_signal_name[last_signal_name];
189 gmx_bool gmx_got_usr_signal()
192 gmx_bool ret = static_cast<gmx_bool>(usr_condition);