ref: db1eb844461b07a25ca49117851fa874fd88e065
dir: /emu/Linux/os.c/
#include <sys/types.h> #include <time.h> #include <termios.h> #include <signal.h> #include <pwd.h> #include <sched.h> #include <sys/resource.h> #include <sys/wait.h> #include <sys/time.h> #include <stdint.h> #include "dat.h" #include "fns.h" #include "error.h" #include <semaphore.h> #include <raise.h> /* glibc 2.3.3-NTPL messes up getpid() by trying to cache the result, so we'll do it ourselves */ #include <sys/syscall.h> #define getpid() syscall(SYS_getpid) enum { DELETE = 0x7f, CTRLC = 'C'-'@', NSTACKSPERALLOC = 16, X11STACK= 256*1024 }; char *hosttype = "Linux"; typedef sem_t Sem; extern int dflag; int gidnobody = -1; int uidnobody = -1; static struct termios tinit; static void sysfault(char *what, void *addr) { char buf[64]; snprint(buf, sizeof(buf), "sys: %s%#p", what, addr); disfault(nil, buf); } static void trapILL(int signo, siginfo_t *si, void *a) { USED(signo); USED(a); sysfault("illegal instruction pc=", si->si_addr); } static int isnilref(siginfo_t *si) { return si != 0 && (si->si_addr == (void*)~(uintptr_t)0 || (uintptr_t)si->si_addr < 512); } static void trapmemref(int signo, siginfo_t *si, void *a) { USED(a); /* ucontext_t*, could fetch pc in machine-dependent way */ if(isnilref(si)) disfault(nil, exNilref); else if(signo == SIGBUS) sysfault("bad address addr=", si->si_addr); /* eg, misaligned */ else sysfault("segmentation violation addr=", si->si_addr); } static void trapFPE(int signo, siginfo_t *si, void *a) { char buf[64]; USED(signo); USED(a); snprint(buf, sizeof(buf), "sys: fp: exception status=%.4lux pc=%#p", getfsr(), si->si_addr); disfault(nil, buf); } static void trapUSR1(int signo) { int intwait; USED(signo); intwait = up->intwait; up->intwait = 0; /* clear it to let proc continue in osleave */ if(up->type != Interp) /* Used to unblock pending I/O */ return; if(intwait == 0) /* Not posted so it's a sync error */ disfault(nil, Eintr); /* Should never happen */ } void oslongjmp(void *regs, osjmpbuf env, int val) { USED(regs); siglongjmp(env, val); } static void termset(void) { struct termios t; tcgetattr(0, &t); tinit = t; t.c_lflag &= ~(ICANON|ECHO|ISIG); t.c_cc[VMIN] = 1; t.c_cc[VTIME] = 0; tcsetattr(0, TCSANOW, &t); } static void termrestore(void) { tcsetattr(0, TCSANOW, &tinit); } void cleanexit(int x) { USED(x); if(up->intwait) { up->intwait = 0; return; } if(dflag == 0) termrestore(); kill(0, SIGKILL); exit(0); } void osreboot(char *file, char **argv) { if(dflag == 0) termrestore(); execvp(file, argv); error("reboot failure"); } void libinit(char *imod) { struct sigaction act; struct passwd *pw; Proc *p; char sys[64]; setsid(); gethostname(sys, sizeof(sys)); kstrdup(&ossysname, sys); pw = getpwnam("nobody"); if(pw != nil) { uidnobody = pw->pw_uid; gidnobody = pw->pw_gid; } if(dflag == 0) termset(); memset(&act, 0, sizeof(act)); act.sa_handler = trapUSR1; sigaction(SIGUSR1, &act, nil); act.sa_handler = SIG_IGN; sigaction(SIGCHLD, &act, nil); /* * For the correct functioning of devcmd in the * face of exiting slaves */ signal(SIGPIPE, SIG_IGN); if(signal(SIGTERM, SIG_IGN) != SIG_IGN) signal(SIGTERM, cleanexit); if(signal(SIGINT, SIG_IGN) != SIG_IGN) signal(SIGINT, cleanexit); if(sflag == 0) { act.sa_flags = SA_SIGINFO; act.sa_sigaction = trapILL; sigaction(SIGILL, &act, nil); act.sa_sigaction = trapFPE; sigaction(SIGFPE, &act, nil); act.sa_sigaction = trapmemref; sigaction(SIGBUS, &act, nil); sigaction(SIGSEGV, &act, nil); act.sa_flags &= ~SA_SIGINFO; } p = newproc(); kprocinit(p); pw = getpwuid(getuid()); if(pw != nil) kstrdup(&eve, pw->pw_name); else print("cannot getpwuid\n"); p->env->uid = getuid(); p->env->gid = getgid(); emuinit(imod); } int readkbd(void) { int n; char buf[1]; n = read(0, buf, sizeof(buf)); if(n < 0) print("keyboard close (n=%d, %s)\n", n, strerror(errno)); if(n <= 0) pexit("keyboard thread", 0); switch(buf[0]) { case '\r': buf[0] = '\n'; break; case DELETE: buf[0] = 'H' - '@'; break; case CTRLC: cleanexit(0); break; } return buf[0]; } /* * Return an abitrary millisecond clock time */ long osmillisec(void) { static long sec0 = 0, usec0; struct timeval t; if(gettimeofday(&t,(struct timezone*)0)<0) return 0; if(sec0 == 0) { sec0 = t.tv_sec; usec0 = t.tv_usec; } return (t.tv_sec-sec0)*1000+(t.tv_usec-usec0+500)/1000; } /* * Return the time since the epoch in nanoseconds and microseconds * The epoch is defined at 1 Jan 1970 */ vlong osnsec(void) { struct timeval t; gettimeofday(&t, nil); return (vlong)t.tv_sec*1000000000L + t.tv_usec*1000; } vlong osusectime(void) { struct timeval t; gettimeofday(&t, nil); return (vlong)t.tv_sec * 1000000 + t.tv_usec; } int osmillisleep(ulong milsec) { struct timespec time; time.tv_sec = milsec/1000; time.tv_nsec= (milsec%1000)*1000000; nanosleep(&time, NULL); return 0; } int limbosleep(ulong milsec) { return osmillisleep(milsec); }