X-Git-Url: https://www.tinc-vpn.org/git/browse?p=tinc;a=blobdiff_plain;f=src%2Fprocess.c;h=a4e2548f8d4983af1239a69bb3d5c7e2e68bbc5b;hp=d618427d5357c3f89ea13e23809851d8d5043e29;hb=faff6498821555e6afb3dc5e4e3b61d448a4fef1;hpb=b413257e10ae0645da43583dd8f84a1f74df5bd7 diff --git a/src/process.c b/src/process.c index d618427d..a4e2548f 100644 --- a/src/process.c +++ b/src/process.c @@ -1,7 +1,7 @@ /* process.c -- process management functions - Copyright (C) 1999-2001 Ivo Timmermans , - 2000,2001 Guus Sliepen + Copyright (C) 1999-2004 Ivo Timmermans , + 2000-2004 Guus Sliepen This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by @@ -17,269 +17,420 @@ along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. - $Id: process.c,v 1.1.2.22 2001/03/13 09:55:14 guus Exp $ + $Id$ */ -#include "config.h" - -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#include -#include -#include +#include "system.h" #include "conf.h" +#include "connection.h" +#include "device.h" +#include "edge.h" +#include "logger.h" +#include "node.h" +#include "pidfile.h" #include "process.h" #include "subnet.h" -#include "connection.h" - -#include "system.h" +#include "utils.h" +#include "xalloc.h" /* If zero, don't detach from the terminal. */ -int do_detach = 1; +bool do_detach = true; +bool sighup = false; +bool sigalrm = false; extern char *identname; extern char *pidfilename; extern char **g_argv; +extern bool use_logfile; +extern volatile bool running; sigset_t emptysigset; -void memory_full(int size) +static int saved_debug_level = -1; + +static void memory_full(int size) { - syslog(LOG_ERR, _("Memory exhausted (couldn't allocate %d bytes), exiting."), size); - cp_trace(); - exit(1); + logger(LOG_ERR, _("Memory exhausted (couldn't allocate %d bytes), exitting."), size); + cp_trace(); + exit(1); } /* Some functions the less gifted operating systems might lack... */ -#ifndef HAVE_FCLOSEALL -int fcloseall(void) -{ - fflush(stdin); - fflush(stdout); - fflush(stderr); - fclose(stdin); - fclose(stdout); - fclose(stderr); +#ifdef HAVE_MINGW +extern char *identname; +extern char *program_name; +extern char **g_argv; + +static SC_HANDLE manager = NULL; +static SC_HANDLE service = NULL; +static SERVICE_STATUS status = {0}; +static SERVICE_STATUS_HANDLE statushandle = 0; + +bool install_service(void) { + char command[4096] = "\""; + char **argp; + bool space; + SERVICE_DESCRIPTION description = {"Virtual Private Network daemon"}; + + manager = OpenSCManager(NULL, NULL, SC_MANAGER_ALL_ACCESS); + if(!manager) { + logger(LOG_ERR, _("Could not open service manager: %s"), winerror(GetLastError())); + return false; + } + + if(!strchr(program_name, '\\')) { + GetCurrentDirectory(sizeof(command) - 1, command + 1); + strncat(command, "\\", sizeof(command)); + } + + strncat(command, program_name, sizeof(command)); + + strncat(command, "\"", sizeof(command)); + + for(argp = g_argv + 1; *argp; argp++) { + space = strchr(*argp, ' '); + strncat(command, " ", sizeof(command)); + + if(space) + strncat(command, "\"", sizeof(command)); + + strncat(command, *argp, sizeof(command)); + + if(space) + strncat(command, "\"", sizeof(command)); + } + + service = CreateService(manager, identname, identname, + SERVICE_ALL_ACCESS, SERVICE_WIN32_OWN_PROCESS, SERVICE_AUTO_START, SERVICE_ERROR_NORMAL, + command, NULL, NULL, NULL, NULL, NULL); + + if(!service) { + logger(LOG_ERR, _("Could not create %s service: %s"), identname, winerror(GetLastError())); + return false; + } + + ChangeServiceConfig2(service, SERVICE_CONFIG_DESCRIPTION, &description); + + logger(LOG_INFO, _("%s service installed"), identname); + + if(!StartService(service, 0, NULL)) + logger(LOG_WARNING, _("Could not start %s service: %s"), identname, winerror(GetLastError())); + else + logger(LOG_INFO, _("%s service started"), identname); + + return true; } -#endif -/* - Close network connections, and terminate neatly -*/ -void cleanup_and_exit(int c) +bool remove_service(void) { + manager = OpenSCManager(NULL, NULL, SC_MANAGER_ALL_ACCESS); + if(!manager) { + logger(LOG_ERR, _("Could not open service manager: %s"), winerror(GetLastError())); + return false; + } + + service = OpenService(manager, identname, SERVICE_ALL_ACCESS); + + if(!service) { + logger(LOG_ERR, _("Could not open %s service: %s"), identname, winerror(GetLastError())); + return false; + } + + if(!ControlService(service, SERVICE_CONTROL_STOP, &status)) + logger(LOG_ERR, _("Could not stop %s service: %s"), identname, winerror(GetLastError())); + else + logger(LOG_INFO, _("%s service stopped"), identname); + + if(!DeleteService(service)) { + logger(LOG_ERR, _("Could not remove %s service: %s"), identname, winerror(GetLastError())); + return false; + } + + logger(LOG_INFO, _("%s service removed"), identname); + + return true; +} + +DWORD WINAPI controlhandler(DWORD request, DWORD type, LPVOID boe, LPVOID bah) { + switch(request) { + case SERVICE_CONTROL_STOP: + logger(LOG_NOTICE, _("Got %s request"), "SERVICE_CONTROL_STOP"); + break; + case SERVICE_CONTROL_SHUTDOWN: + logger(LOG_NOTICE, _("Got %s request"), "SERVICE_CONTROL_SHUTDOWN"); + break; + default: + logger(LOG_WARNING, _("Got unexpected request %d"), request); + return ERROR_CALL_NOT_IMPLEMENTED; + } + + if(running) { + running = false; + status.dwWaitHint = 30000; + status.dwCurrentState = SERVICE_STOP_PENDING; + SetServiceStatus(statushandle, &status); + return NO_ERROR; + } else { + status.dwWaitHint = 0; + status.dwCurrentState = SERVICE_STOPPED; + SetServiceStatus(statushandle, &status); + exit(1); + } + +} + +VOID WINAPI run_service(DWORD argc, LPTSTR* argv) { -cp - close_network_connections(); + int err = 1; + extern int main2(int argc, char **argv); + + + status.dwServiceType = SERVICE_WIN32; + status.dwControlsAccepted = SERVICE_ACCEPT_STOP | SERVICE_ACCEPT_SHUTDOWN; + status.dwWin32ExitCode = 0; + status.dwServiceSpecificExitCode = 0; + status.dwCheckPoint = 0; + + statushandle = RegisterServiceCtrlHandlerEx(identname, controlhandler, NULL); + + if (!statushandle) { + logger(LOG_ERR, _("System call `%s' failed: %s"), "RegisterServiceCtrlHandlerEx", winerror(GetLastError())); + err = 1; + } else { + status.dwWaitHint = 30000; + status.dwCurrentState = SERVICE_START_PENDING; + SetServiceStatus(statushandle, &status); + + status.dwWaitHint = 0; + status.dwCurrentState = SERVICE_RUNNING; + SetServiceStatus(statushandle, &status); - if(debug_lvl > DEBUG_NOTHING) - syslog(LOG_INFO, _("Total bytes written: tap %d, socket %d; bytes read: tap %d, socket %d"), - total_tap_out, total_socket_out, total_tap_in, total_socket_in); + err = main2(argc, argv); - syslog(LOG_NOTICE, _("Terminating")); + status.dwWaitHint = 0; + status.dwCurrentState = SERVICE_STOPPED; + //status.dwWin32ExitCode = err; + SetServiceStatus(statushandle, &status); + } - closelog(); - exit(c); + return; } +bool init_service(void) { + SERVICE_TABLE_ENTRY services[] = { + {identname, run_service}, + {NULL, NULL} + }; + + if(!StartServiceCtrlDispatcher(services)) { + if(GetLastError() == ERROR_FAILED_SERVICE_CONTROLLER_CONNECT) { + return false; + } + else + logger(LOG_ERR, _("System call `%s' failed: %s"), "StartServiceCtrlDispatcher", winerror(GetLastError())); + } + + return true; +} +#endif + +#ifndef HAVE_MINGW /* check for an existing tinc for this net, and write pid to pidfile */ -int write_pidfile(void) +static bool write_pidfile(void) { - int pid; -cp - if((pid = check_pid(pidfilename))) - { - if(netname) - fprintf(stderr, _("A tincd is already running for net `%s' with pid %d.\n"), - netname, pid); - else - fprintf(stderr, _("A tincd is already running with pid %d.\n"), pid); - return 1; - } - - /* if it's locked, write-protected, or whatever */ - if(!write_pid(pidfilename)) - return 1; -cp - return 0; + pid_t pid; + + cp(); + + pid = check_pid(pidfilename); + + if(pid) { + if(netname) + fprintf(stderr, _("A tincd is already running for net `%s' with pid %ld.\n"), + netname, (long)pid); + else + fprintf(stderr, _("A tincd is already running with pid %ld.\n"), (long)pid); + return false; + } + + /* if it's locked, write-protected, or whatever */ + if(!write_pid(pidfilename)) { + fprintf(stderr, _("Could write pid file %s: %s\n"), pidfilename, strerror(errno)); + return false; + } + + return true; } +#endif /* kill older tincd for this net */ -int kill_other(void) +bool kill_other(int signal) { - int pid; -cp - if(!(pid = read_pid(pidfilename))) - { - if(netname) - fprintf(stderr, _("No other tincd is running for net `%s'.\n"), netname); - else - fprintf(stderr, _("No other tincd is running.\n")); - return 1; - } - - errno = 0; /* No error, sometimes errno is only changed on error */ - /* ESRCH is returned when no process with that pid is found */ - if(kill(pid, SIGTERM) && errno == ESRCH) - fprintf(stderr, _("Removing stale lock file.\n")); - remove_pid(pidfilename); -cp - return 0; +#ifndef HAVE_MINGW + pid_t pid; + + cp(); + + pid = read_pid(pidfilename); + + if(!pid) { + if(netname) + fprintf(stderr, _("No other tincd is running for net `%s'.\n"), + netname); + else + fprintf(stderr, _("No other tincd is running.\n")); + return false; + } + + errno = 0; /* No error, sometimes errno is only changed on error */ + + /* ESRCH is returned when no process with that pid is found */ + if(kill(pid, signal) && errno == ESRCH) { + if(netname) + fprintf(stderr, _("The tincd for net `%s' is no longer running. "), + netname); + else + fprintf(stderr, _("The tincd is no longer running. ")); + + fprintf(stderr, _("Removing stale lock file.\n")); + remove_pid(pidfilename); + } + + return true; +#else + return remove_service(); +#endif } /* Detach from current terminal, write pidfile, kill parent */ -int detach(void) +bool detach(void) { -cp - setup_signals(); + cp(); + + setup_signals(); - /* First check if we can open a fresh new pidfile */ - - if(write_pidfile()) - return -1; + /* First check if we can open a fresh new pidfile */ - /* If we succeeded in doing that, detach */ +#ifndef HAVE_MINGW + if(!write_pidfile()) + return false; - closelog(); + /* If we succeeded in doing that, detach */ - if(do_detach) - { - if(daemon(0, 0) < 0) - { - fprintf(stderr, _("Couldn't detach from terminal: %m")); - return -1; + closelogger(); +#endif + + if(do_detach) { +#ifndef HAVE_MINGW + if(daemon(0, 0)) { + fprintf(stderr, _("Couldn't detach from terminal: %s"), + strerror(errno)); + return false; + } + + /* Now UPDATE the pid in the pidfile, because we changed it... */ + + if(!write_pid(pidfilename)) { + fprintf(stderr, _("Could not write pid file %s: %s\n"), pidfilename, strerror(errno)); + return false; + } +#else + if(!statushandle) + exit(install_service()); +#endif } - /* Now UPDATE the pid in the pidfile, because we changed it... */ - - if(!write_pid(pidfilename)) - return -1; - } - - openlog(identname, LOG_CONS | LOG_PID, LOG_DAEMON); - - if(debug_lvl > DEBUG_NOTHING) - syslog(LOG_NOTICE, _("tincd %s (%s %s) starting, debug level %d"), - VERSION, __DATE__, __TIME__, debug_lvl); - else - syslog(LOG_NOTICE, _("tincd %s starting"), VERSION); - - xalloc_fail_func = memory_full; -cp - return 0; + openlogger(identname, use_logfile?LOGMODE_FILE:(do_detach?LOGMODE_SYSLOG:LOGMODE_STDERR)); + + logger(LOG_NOTICE, _("tincd %s (%s %s) starting, debug level %d"), + VERSION, __DATE__, __TIME__, debug_level); + + xalloc_fail_func = memory_full; + + return true; } -/* - Execute the program name, with sane environment. All output will be - redirected to syslog. -*/ -void _execute_script(const char *name) __attribute__ ((noreturn)); -void _execute_script(const char *name) +bool execute_script(const char *name, char **envp) { - char *scriptname; - char *s; -cp - if(netname) - { - asprintf(&s, "NETNAME=%s", netname); - putenv(s); /* Don't free s! see man 3 putenv */ - } -#ifdef HAVE_UNSETENV - else - { - unsetenv("NETNAME"); - } +#ifdef HAVE_SYSTEM + int status, len; + struct stat s; + char *scriptname, *p; + int i; + + cp(); + +#ifndef HAVE_MINGW + len = asprintf(&scriptname, "\"%s/%s\"", confbase, name); +#else + len = asprintf(&scriptname, "\"%s/%s.bat\"", confbase, name); #endif + if(len < 0) + return false; - chdir("/"); - - asprintf(&scriptname, "%s/%s", confbase, name); - - /* Close all file descriptors */ - closelog(); /* <- this means we cannot use syslog() here anymore! */ - fcloseall(); - - execl(scriptname, NULL); - /* No return on success */ - - if(errno != ENOENT) /* Ignore if the file does not exist */ - exit(1); /* Some error while trying execl(). */ - else - exit(0); -} + scriptname[len - 1] = '\0'; -/* - Fork and execute the program pointed to by name. -*/ -int execute_script(const char *name) -{ - pid_t pid; - int status; -cp - if((pid = fork()) < 0) - { - syslog(LOG_ERR, _("System call `%s' failed: %m"), - "fork"); - return -1; - } - - if(pid) - { - if(debug_lvl >= DEBUG_STATUS) - syslog(LOG_INFO, _("Executing script %s"), name); - - if(waitpid(pid, &status, 0) == pid) - { - if(WIFEXITED(status)) /* Child exited by itself */ - { - if(WEXITSTATUS(status)) - { - syslog(LOG_ERR, _("Process %d (%s) exited with non-zero status %d"), pid, name, WEXITSTATUS(status)); - return -1; - } - else - return 0; - } - else if(WIFSIGNALED(status)) /* Child was killed by a signal */ - { - syslog(LOG_ERR, _("Process %d (%s) was killed by signal %d (%s)"), - pid, name, WTERMSIG(status), strsignal(WTERMSIG(status))); - return -1; - } - else /* Something strange happened */ - { - syslog(LOG_ERR, _("Process %d (%s) terminated abnormally"), pid, name); - return -1; - } - } - else - { - syslog(LOG_ERR, _("System call `%s' failed: %m"), "waitpid"); - return -1; - } - } -cp - /* Child here */ - - _execute_script(name); + /* First check if there is a script */ + + if(stat(scriptname + 1, &s)) + return true; + + ifdebug(STATUS) logger(LOG_INFO, _("Executing script %s"), name); + +#ifdef HAVE_PUTENV + /* Set environment */ + + for(i = 0; envp[i]; i++) + putenv(envp[i]); +#endif + + scriptname[len - 1] = '\"'; + status = system(scriptname); + + free(scriptname); + + /* Unset environment */ + + for(i = 0; envp[i]; i++) { + char *e = strchr(envp[i], '='); + if(e) { + p = alloca(e - envp[i] + 1); + strncpy(p, envp[i], e - envp[i]); + p[e - envp[i]] = '\0'; + putenv(p); + } + } + +#ifdef WEXITSTATUS + if(status != -1) { + if(WIFEXITED(status)) { /* Child exited by itself */ + if(WEXITSTATUS(status)) { + logger(LOG_ERR, _("Script %s exited with non-zero status %d"), + name, WEXITSTATUS(status)); + return false; + } + } else if(WIFSIGNALED(status)) { /* Child was killed by a signal */ + logger(LOG_ERR, _("Script %s was killed by signal %d (%s)"), + name, WTERMSIG(status), strsignal(WTERMSIG(status))); + return false; + } else { /* Something strange happened */ + logger(LOG_ERR, _("Script %s terminated abnormally"), name); + return false; + } + } else { + logger(LOG_ERR, _("System call `%s' failed: %s"), "system", strerror(errno)); + return false; + } +#endif +#endif + return true; } @@ -287,147 +438,170 @@ cp Signal handlers. */ -RETSIGTYPE -sigterm_handler(int a, siginfo_t *info, void *b) +#ifndef HAVE_MINGW +static RETSIGTYPE sigterm_handler(int a) { - if(debug_lvl > DEBUG_NOTHING) - syslog(LOG_NOTICE, _("Got TERM signal")); + logger(LOG_NOTICE, _("Got %s signal"), "TERM"); + if(running) + running = false; + else + exit(1); +} - cleanup_and_exit(0); +static RETSIGTYPE sigquit_handler(int a) +{ + logger(LOG_NOTICE, _("Got %s signal"), "QUIT"); + if(running) + running = false; + else + exit(1); } -RETSIGTYPE -sigquit_handler(int a, siginfo_t *info, void *b) +static RETSIGTYPE fatal_signal_square(int a) { - if(debug_lvl > DEBUG_NOTHING) - syslog(LOG_NOTICE, _("Got QUIT signal")); - cleanup_and_exit(0); + logger(LOG_ERR, _("Got another fatal signal %d (%s): not restarting."), a, + strsignal(a)); + cp_trace(); + exit(1); } -RETSIGTYPE -sigsegv_square(int a, siginfo_t *info, void *b) +static RETSIGTYPE fatal_signal_handler(int a) { - syslog(LOG_ERR, _("Got another SEGV signal: not restarting")); - cp_trace(); - exit(1); + struct sigaction act; + logger(LOG_ERR, _("Got fatal signal %d (%s)"), a, strsignal(a)); + cp_trace(); + + if(do_detach) { + logger(LOG_NOTICE, _("Trying to re-execute in 5 seconds...")); + + act.sa_handler = fatal_signal_square; + act.sa_mask = emptysigset; + act.sa_flags = 0; + sigaction(SIGSEGV, &act, NULL); + + close_network_connections(); + sleep(5); + remove_pid(pidfilename); + execvp(g_argv[0], g_argv); + } else { + logger(LOG_NOTICE, _("Not restarting.")); + exit(1); + } } -RETSIGTYPE -sigsegv_handler(int a, siginfo_t *info, void *b) +static RETSIGTYPE sighup_handler(int a) { - struct sigaction act; - syslog(LOG_ERR, _("Got SEGV signal")); - cp_trace(); - - if(do_detach) - { - syslog(LOG_NOTICE, _("Trying to re-execute in 5 seconds...")); - - act.sa_handler = NULL; - act.sa_mask = emptysigset; - act.sa_flags = SA_SIGINFO; - act.sa_sigaction = sigsegv_square; - - close_network_connections(); - sleep(5); - remove_pid(pidfilename); - execvp(g_argv[0], g_argv); - } - else - { - syslog(LOG_NOTICE, _("Not restarting.")); - exit(0); - } + logger(LOG_NOTICE, _("Got %s signal"), "HUP"); + sighup = true; } -RETSIGTYPE -sighup_handler(int a, siginfo_t *info, void *b) +static RETSIGTYPE sigint_handler(int a) { - if(debug_lvl > DEBUG_NOTHING) - syslog(LOG_NOTICE, _("Got HUP signal")); - sighup = 1; + logger(LOG_NOTICE, _("Got %s signal"), "INT"); + + if(saved_debug_level != -1) { + logger(LOG_NOTICE, _("Reverting to old debug level (%d)"), + saved_debug_level); + debug_level = saved_debug_level; + saved_debug_level = -1; + } else { + logger(LOG_NOTICE, + _("Temporarily setting debug level to 5. Kill me with SIGINT again to go back to level %d."), + debug_level); + saved_debug_level = debug_level; + debug_level = 5; + } } -RETSIGTYPE -sigint_handler(int a, siginfo_t *info, void *b) +static RETSIGTYPE sigalrm_handler(int a) { - if(debug_lvl > DEBUG_NOTHING) - syslog(LOG_NOTICE, _("Got INT signal, exiting")); - cleanup_and_exit(0); + logger(LOG_NOTICE, _("Got %s signal"), "ALRM"); + sigalrm = true; } -RETSIGTYPE -sigusr1_handler(int a, siginfo_t *info, void *b) +static RETSIGTYPE sigusr1_handler(int a) { - dump_connection_list(); + dump_connections(); } -RETSIGTYPE -sigusr2_handler(int a, siginfo_t *info, void *b) +static RETSIGTYPE sigusr2_handler(int a) { - dump_subnet_list(); + dump_device_stats(); + dump_nodes(); + dump_edges(); + dump_subnets(); } -RETSIGTYPE -unexpected_signal_handler(int a, siginfo_t *info, void *b) +static RETSIGTYPE sigwinch_handler(int a) { - syslog(LOG_WARNING, _("Got unexpected signal %d (%s)"), a, strsignal(a)); - cp_trace(); + do_purge = true; } -RETSIGTYPE -ignore_signal_handler(int a, siginfo_t *info, void *b) +static RETSIGTYPE unexpected_signal_handler(int a) { - if(debug_lvl >= DEBUG_SCARY_THINGS) - { - syslog(LOG_WARNING, _("Got unexpected signal %d (%s)"), a, strsignal(a)); - cp_trace(); - } + logger(LOG_WARNING, _("Got unexpected signal %d (%s)"), a, strsignal(a)); + cp_trace(); } -struct { - int signal; - void (*handler)(int, siginfo_t *, void *); +static RETSIGTYPE ignore_signal_handler(int a) +{ + ifdebug(SCARY_THINGS) logger(LOG_DEBUG, _("Ignored signal %d (%s)"), a, strsignal(a)); +} + +static struct { + int signal; + void (*handler)(int); } sighandlers[] = { - { SIGHUP, sighup_handler }, - { SIGTERM, sigterm_handler }, - { SIGQUIT, sigquit_handler }, - { SIGSEGV, sigsegv_handler }, - { SIGPIPE, ignore_signal_handler }, - { SIGINT, sigint_handler }, - { SIGUSR1, sigusr1_handler }, - { SIGUSR2, sigusr2_handler }, - { SIGCHLD, ignore_signal_handler }, - { SIGALRM, ignore_signal_handler }, - { 0, NULL } + {SIGHUP, sighup_handler}, + {SIGTERM, sigterm_handler}, + {SIGQUIT, sigquit_handler}, + {SIGSEGV, fatal_signal_handler}, + {SIGBUS, fatal_signal_handler}, + {SIGILL, fatal_signal_handler}, + {SIGPIPE, ignore_signal_handler}, + {SIGINT, sigint_handler}, + {SIGUSR1, sigusr1_handler}, + {SIGUSR2, sigusr2_handler}, + {SIGCHLD, ignore_signal_handler}, + {SIGALRM, sigalrm_handler}, + {SIGWINCH, sigwinch_handler}, + {0, NULL} }; +#endif -void -setup_signals(void) +void setup_signals(void) { - int i; - struct sigaction act; - - sigemptyset(&emptysigset); - act.sa_handler = NULL; - act.sa_mask = emptysigset; - act.sa_flags = SA_SIGINFO; - - /* Set a default signal handler for every signal, errors will be - ignored. */ - for(i = 0; i < NSIG; i++) - { - act.sa_sigaction = unexpected_signal_handler; - sigaction(i, &act, NULL); - } - - /* Then, for each known signal that we want to catch, assign a - handler to the signal, with error checking this time. */ - for(i = 0; sighandlers[i].signal; i++) - { - act.sa_sigaction = sighandlers[i].handler; - if(sigaction(sighandlers[i].signal, &act, NULL) < 0) - fprintf(stderr, _("Installing signal handler for signal %d (%s) failed: %m\n"), - sighandlers[i].signal, strsignal(sighandlers[i].signal)); - } +#ifndef HAVE_MINGW + int i; + struct sigaction act; + + sigemptyset(&emptysigset); + act.sa_handler = NULL; + act.sa_mask = emptysigset; + act.sa_flags = 0; + + /* Set a default signal handler for every signal, errors will be + ignored. */ + for(i = 0; i < NSIG; i++) { + if(!do_detach) + act.sa_handler = SIG_DFL; + else + act.sa_handler = unexpected_signal_handler; + sigaction(i, &act, NULL); + } + + /* If we didn't detach, allow coredumps */ + if(!do_detach) + sighandlers[3].handler = SIG_DFL; + + /* Then, for each known signal that we want to catch, assign a + handler to the signal, with error checking this time. */ + for(i = 0; sighandlers[i].signal; i++) { + act.sa_handler = sighandlers[i].handler; + if(sigaction(sighandlers[i].signal, &act, NULL) < 0) + fprintf(stderr, _("Installing signal handler for signal %d (%s) failed: %s\n"), + sighandlers[i].signal, strsignal(sighandlers[i].signal), + strerror(errno)); + } +#endif }