X-Git-Url: https://git.cinelerra-gg.org/git/?p=goodguy%2Fcinelerra.git;a=blobdiff_plain;f=cinelerra-5.1%2Fprof2%2Fprofile.c;fp=cinelerra-5.1%2Fprof2%2Fprofile.c;h=6103b5334a10b3a4d6fe6aba13a6484b849ada25;hp=0000000000000000000000000000000000000000;hb=c053918502e6ec08433a0650ce37af35431f15b7;hpb=c5451a0a1f2a69ffea5e8b85d05787466f355481

diff --git a/cinelerra-5.1/prof2/profile.c b/cinelerra-5.1/prof2/profile.c
new file mode 100644
index 00000000..6103b533
--- /dev/null
+++ b/cinelerra-5.1/prof2/profile.c
@@ -0,0 +1,843 @@
+#include <stdio.h>
+#include <unistd.h>
+#include <signal.h>
+#include <ucontext.h>
+#include <pthread.h>
+#include <link.h>
+
+#define smCommand "smap 2> /dev/null < "
+#ifdef __i386__
+#define nmAddr 0
+#define nmType 9
+#define nmName 11
+#define _LX "%08lx"
+#ifndef LIB
+#define LIB "/lib"
+#endif
+#endif
+#ifdef __x86_64__
+#define nmAddr 0
+#define nmType 17
+#define nmName 19
+#define _LX "%016lx"
+#ifndef LIB
+#define LIB "/lib64"
+#endif
+#endif
+
+#define unlikely(x) __builtin_expect(!!(x), 0)
+#define dprintf(s...) do { if( unlikely(prof_debug!=0) ) fprintf(s); } while(0)
+
+int profileMain(int ac,char **av,char **ev);
+void profileStart(void);
+void profileStop(void);
+void profileClear(void);
+void profileShow(void);
+void profileDone(void);
+
+#include <string.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include <fcntl.h>
+#include <time.h>
+#include <limits.h>
+#include <sys/time.h>
+#include <sys/times.h>
+
+#define MAP2MAX 256
+#define MAPINCR 64
+#define MOD2MAX 256
+#define MODINCR 64
+#define SYM2MAX 1024*256
+#define SYMINCR 1024*16
+#if 0
+static volatile long prof_debug = 1;
+static volatile long prof_type = 0;
+static volatile long prof_tmrval = 10000;
+static volatile unsigned long prof_stkptr = INT_MAX-0x1000;
+static volatile char prof_output[256] = { "-" };
+#else
+static volatile long prof_debug; /* enable debug output */
+static volatile long prof_type; /* 0=usr+sys, 1=usr only, 2=real time */
+static volatile long prof_tmrval; /* profile timer interval in usecs */
+static volatile unsigned long prof_stkptr; /* top of stack at profileStart */
+static volatile char prof_output[256]; /* profile output file name */
+#endif
+
+static FILE *prof_fp = NULL;
+
+typedef struct {
+   char *name;
+   unsigned long offs;
+} tMap;
+
+typedef struct {
+   int n, m;
+   tMap map[MAPINCR];
+} tMapTbl;
+
+typedef struct {
+   char *name;
+   unsigned long offs;
+   int count;
+   int calls;
+} tMod;
+
+typedef struct {
+   int n, m;
+   tMod mod[MODINCR];
+} tModTbl;
+
+typedef struct {
+   char *name;
+   unsigned long adr;
+   int count;
+   int calls;
+   int tick;
+   int tcalls;
+   int mod;
+} tSym;
+
+typedef struct {
+   int n, m;
+   tSym sym[SYMINCR];
+} tSymTbl;
+
+static tSymTbl *tsym = NULL;
+static tModTbl *tmod = NULL;
+static tMapTbl *tmap = NULL;
+static int nTicks;               /* profile timer tick count */
+static struct tms start_cpu;     /* cpu time at profile_start */
+static struct tms stop_cpu;      /* cpu time at profile_stop */
+static struct timeval start_clk; /* real time at profile_start */
+static struct timeval stop_clk;  /* real time at profile_stop */
+
+int profileActive = 0;           /* flag, true if profile handler active */
+static struct sigaction oldSig;  /* orignal profile handler data */
+static struct sigaction oldSegv; /* orignal segv handler data */
+
+static tMapTbl *
+newMapTbl(void)
+{
+   tMapTbl *tp;
+   if( (tp=malloc(sizeof(*tp))) != NULL ) {
+      tp->n = 0;
+      tp->m = sizeof(tp->map)/sizeof(tp->map[0]);
+   }
+   return tp;
+}
+
+static tModTbl *
+newModTbl(void)
+{
+   tModTbl *tp;
+   if( (tp=malloc(sizeof(*tp))) != NULL ) {
+      tp->n = 0;
+      tp->m = sizeof(tp->mod)/sizeof(tp->mod[0]);
+   }
+   return tp;
+}
+
+static tSymTbl *
+newSymTbl(void)
+{
+   tSymTbl *tp;
+   if( (tp=malloc(sizeof(*tp))) != NULL ) {
+      tp->n = 0;
+      tp->m = sizeof(tp->sym)/sizeof(tp->sym[0]);
+   }
+   return tp;
+}
+
+static tSym *
+newSym(tSymTbl **ptp,const char *name,unsigned long adr,int mod)
+{
+   tSym *sp;
+   tSymTbl *tp = *ptp;
+   int n = tp->n;
+   int m = tp->m;
+   if( n >= m ) {
+      tSymTbl *rp;  int l;
+      m = m < SYM2MAX ? m*2 : m+SYMINCR;
+      l = sizeof(*tp)-sizeof(tp->sym)+m*sizeof(tp->sym[0]);
+      rp = (tSymTbl*) realloc(tp,l);
+      if( rp == NULL ) return NULL;
+      tp = rp;
+      tp->m = m;
+      *ptp = tp;
+   }
+   sp = &tp->sym[n++];
+   tp->n = n;
+   sp->name = strdup(name);
+   sp->adr = adr;
+   sp->mod = mod;
+   sp->count = sp->calls = 0;
+   sp->tick = sp->tcalls = 0;
+   return sp;
+}
+
+static int
+newMod(tModTbl **ptp, const char *name, unsigned long offs)
+{
+   tMod *mp;
+   tModTbl *tp = *ptp;
+   int n = tp->n;
+   int m = tp->m;
+   if( n >= m ) {
+      tModTbl *rp;  int l;
+      m = m < MOD2MAX ? m*2 : m+MODINCR;
+      l = sizeof(*tp)-sizeof(tp->mod)+m*sizeof(tp->mod[0]);
+      rp = (tModTbl*) realloc(tp,l);
+      if( !rp ) return -1;
+      tp = rp;
+      *ptp = tp;
+   }
+   int ret = n++;
+   mp = &tp->mod[ret];
+   tp->n = n;
+   mp->name = strdup(name);
+   mp->offs = offs;
+   mp->count = mp->calls = 0;
+   return ret;
+}
+
+int
+findMod(tModTbl *tp, const char *nm)
+{
+   int n = tp->n;
+   while( --n >= 0 && strcmp(nm,tp->mod[n].name) );
+   return n;
+}
+
+static int
+newMap(tMapTbl **ptp, const char *name, unsigned long offs)
+{
+   tMap *mp;
+   tMapTbl *tp = *ptp;
+   int n = tp->n;
+   int m = tp->m;
+   if( n >= m ) {
+      tMapTbl *rp;  int l;
+      m = m < MAP2MAX ? m*2 : m+MAPINCR;
+      l = sizeof(*tp)-sizeof(tp->map)+m*sizeof(tp->map[0]);
+      rp = (tMapTbl*) realloc(tp,l);
+      if( !rp ) return -1;
+      tp = rp;
+      *ptp = tp;
+   }
+   int ret = n++;
+   mp = &tp->map[ret];
+   tp->n = n;
+   mp->name = strdup(name);
+   mp->offs = offs;
+   return ret;
+}
+
+static void
+delMapTbl(tMapTbl **ptp)
+{
+   int i;  char *name;
+   tMapTbl *tp;  tMap *mp;
+   if( (tp=*ptp) == NULL ) return;
+   mp = &tp->map[0];
+   for( i=tp->n; --i>=0; ++mp ) {
+      if( (name=mp->name) != NULL )
+         free(name);
+   }
+   free(tp);
+   *ptp = NULL;
+}
+
+static void
+delModTbl(tModTbl **ptp)
+{
+   int i;  char *name;
+   tModTbl *tp;  tMod *mp;
+   if( (tp=*ptp) == NULL ) return;
+   mp = &tp->mod[0];
+   for( i=tp->n; --i>=0; ++mp ) {
+      if( (name=mp->name) != NULL )
+         free(name);
+   }
+   free(tp);
+   *ptp = NULL;
+}
+
+static void
+delSymTbl(tSymTbl **ptp)
+{
+   int i;  char *name;
+   tSymTbl *tp;  tSym *sp;
+   if( (tp=*ptp) == NULL ) return;
+   sp = &tp->sym[0];
+   for( i=tp->n; --i>=0; ++sp ) {
+      if( (name=sp->name) != NULL )
+         free(name);
+   }
+   free(tp);
+   *ptp = NULL;
+}
+
+static void
+delAllTbls(void)
+{
+   delMapTbl(&tmap);
+   delModTbl(&tmod);
+   delSymTbl(&tsym);
+}
+
+static int
+mapLkup(tMapTbl *tp,const char *nm)
+{
+   tMap *mp = &tp->map[0];
+   int n = tp->n;
+   while( --n >= 0 && strcmp(nm,mp->name)!=0 )
+     ++mp;
+   return n;
+}
+
+static int
+findMap(tMapTbl *tp,char *nm)
+{
+   int ret = mapLkup(tp,nm);
+   if( ret < 0 )
+      dprintf(stderr,"cant find map '%s'\n",nm);
+   return ret;
+}
+
+static int
+findSymAdr(tSymTbl *tp,const char *nm,unsigned long *adr)
+{
+  int n = tp->n;
+  while( --n >= 0 && strcmp(nm,tp->sym[n].name) );
+  if( n < 0 ) return 1;
+  *adr = tp->sym[n].adr;
+  return 0;
+}
+
+static int
+isSymNm(char *cp, char *bp)
+{
+   int ch;
+   while( (ch=*cp++) != 0 ) {
+      if( ch == '\n' ) break;
+      *bp++ = ch;
+      if( ch == '#' || ch == '$' || ch == '.' ) return 0;
+   }
+   *bp = 0;
+   return 1;
+}
+
+static int
+hex(char *cp, unsigned long *val)
+{
+   char *bp = cp;
+   *val = strtoul(cp,&bp,16);
+   return bp - cp;
+}
+
+static int
+mapMod(char *fn,tSymTbl **ptp, int mod)
+{
+   char nmLine[512], nmCmd[512], *lp;
+   unsigned long adr, ofs;  int typ;
+   FILE *fp;  tMod *mp;
+   if( access(fn, R_OK) < 0 ) return -1;
+   strcpy(&nmCmd[0],smCommand);
+   strcat(&nmCmd[0],fn);
+   lp = NULL;
+   if( (fp=popen(&nmCmd[0],"r")) == NULL ) return -1;
+   mp = &tmod->mod[mod];  ofs = mp->offs;
+   while((lp=fgets(&nmLine[0],sizeof nmLine,fp)) != NULL ) {
+      typ = nmLine[nmType];
+      if( typ != 'T' && typ != 't' ) continue;
+      if( isSymNm(&nmLine[nmName],&nmCmd[0]) == 0 ) continue;
+      if( hex(&nmLine[nmAddr],&adr) != nmType-1 ) continue;
+      adr += ofs;
+      if( newSym(ptp,&nmCmd[0],adr,mod) == NULL ) break;
+   } while((lp=fgets(&nmLine[0],sizeof nmLine,fp)) != NULL );
+   pclose(fp);
+   return lp != NULL ? -1 : 0;
+}
+
+static int
+adrCmpr(const void *a, const void *b)
+{
+   unsigned long aadr = ((tSym*)a)->adr;
+   unsigned long badr = ((tSym*)b)->adr;
+   if( aadr > badr ) return 1;
+   if( aadr < badr ) return -1;
+   return 0;
+}
+
+static int
+cntCmpr(const void *a, const void *b)
+{
+   int acnt = ((tSym*)a)->count;
+   int bcnt = ((tSym*)b)->count;
+   return acnt - bcnt;
+}
+
+static int
+tclCmpr(const void *a, const void *b)
+{
+   int atcl = ((tSym*)a)->tcalls;
+   int btcl = ((tSym*)b)->tcalls;
+   return atcl - btcl;
+}
+
+static int
+modCmpr(const void *a, const void *b)
+{
+   int acnt = ((tMod*)a)->count;
+   int bcnt = ((tMod*)b)->count;
+   return acnt - bcnt;
+}
+
+static int
+profile_tally(unsigned long pc, int cnt)
+{
+   tSym *sp, *tp;
+   int l, m, r;
+   if( tsym == NULL )
+      return -1;
+   sp = tp = &tsym->sym[0];
+   l = -1;  r = tsym->n;
+ /* find function containing pc */
+   while( (r-l) > 1 ) {
+      m = (r+l) >> 1;
+      sp = &tp[m];
+      if( sp->adr == pc ) break;
+      if( sp->adr < pc ) l = m;
+      else r = m;
+   }
+   if( sp->adr != pc ) {
+      if( l < 0 )
+         return -1;
+      sp = &tp[l];
+   }
+   tMod *mp = &tmod->mod[sp->mod];
+/* incr function/module calls/counts */
+   ++sp->calls;
+   ++mp->calls;
+/* only 1 call per unwinding */
+   if( sp->tick < nTicks ) {
+      sp->tick = nTicks;
+      ++sp->tcalls;
+   }
+   if( cnt != 0 ) {
+      ++sp->count;
+      ++mp->count;
+   }
+   return 0;
+}
+
+struct reg_frame {
+   unsigned long rf_fp;        /* frame pointer */
+   unsigned long rf_rtn;       /* return addr */
+};
+
+static int readProcMaps(unsigned long *fwa)
+{
+   int ret, n, m, fd, len;
+   unsigned long vm_start, vm_end, ino;
+   char mr, mw, mx, ms, *bp;
+   off_t pgoff;
+   unsigned int maj, min;
+   char mfn[PATH_MAX], ifn[PATH_MAX];
+   char bfr[65536];
+   pid_t pid = getpid();
+   ret = 1;
+   snprintf(&mfn[0],sizeof mfn,"/proc/%d/maps",pid);
+   fd = open(&mfn[0],O_RDONLY);
+   if( fd >= 0 ) {
+      len = read(fd,bp=&bfr[0],sizeof bfr);
+      close(fd);
+      while( len > 0 ) {
+         m = sscanf(bp, "%lx-%lx %c%c%c%c %lx %x:%x %lu%n",
+            &vm_start,&vm_end,&mr,&mw,&mx,&ms,&pgoff,&maj,&min,&ino,&n);
+         if( m == 10 && fwa ) { *fwa = vm_start;  fwa = 0; }
+         if( m == 10 && mx == 'x' && pgoff == 0 ) {
+            for( bp+=n,len-=n ; len>0 && *bp!='\n' && *bp==' '; ++bp,--len );
+            for( m=0 ; len>0 && *bp!='\n' && m<PATH_MAX-1; ++bp,--len )
+               ifn[m++] = *bp;
+            ifn[m] = 0;
+            if( maj !=0 || min != 0 ) {
+               dprintf(stderr," map "_LX" %s\n",vm_start,&ifn[0]);
+               newMap(&tmap,&ifn[0],vm_start);
+            }
+         }
+         while( --len>=0 && *bp++!='\n' );
+      }
+      ret = 0;
+   }
+   return ret;
+}
+
+static int readNmMaps(unsigned long fwa)
+{
+   unsigned long adr;
+   int i, k;
+   char dfn[PATH_MAX], efn[PATH_MAX], pfn[PATH_MAX];
+   struct link_map *so;
+   struct r_debug *rdebug = &_r_debug;
+   for( so=rdebug->r_map; so!=NULL; so=so->l_next ) {
+      int n = tsym->n;
+      char *nm = &so->l_name[0];
+      if( nm[0] == 0 ) nm = "/proc/self/exe";
+      dprintf(stderr,"resolving %s\n",nm);
+      if( nm[0] == '.' && nm[1] == '/' ) {
+        getcwd(&pfn[0],sizeof(pfn));
+        strcat(&pfn[0],&nm[1]);
+        nm = &pfn[0];
+      }
+      while( (i=readlink(nm,&efn[0],sizeof(efn)-1)) >= 0 ) {
+        efn[i] = 0;
+        dprintf(stderr,"  link %s\n",&efn[0]);
+        if( efn[0] != '/' ) { /* get dirname */
+           for( k=-1,i=0; i<sizeof(dfn)-1 && (dfn[i++]=*nm)!=0; ++nm )
+             if( *nm == '/' ) k = i;
+           if( k >= 0 ) {     /* add link name */
+             for( i=0; k<sizeof(dfn)-1 && (dfn[k++]=efn[i])!=0; ++i );
+           }
+           strncpy(&efn[0],&dfn[0],sizeof(efn));
+        }
+        nm = &efn[0];
+        dprintf(stderr,"  path %s\n",nm);
+      }
+      if( findMod(tmod,nm) >= 0 ) continue;
+      int map = !so->l_name[0] ? -1 : findMap(tmap, nm);
+      tMap *mp = map>=0 ? &tmap->map[map] : 0;
+      adr = mp ? mp->offs : (unsigned long) so->l_addr;
+      if( !adr ) adr = fwa;
+      dprintf(stderr,"  map %s adr = 0x"_LX" ofs = 0x"_LX"\n",
+          nm,adr,(unsigned long)so->l_addr);
+      int mod = newMod(&tmod,nm,adr);
+      if( mod >= 0 ) {
+         if( mapMod(nm,&tsym,mod) < 0 || tsym->n == n ) {
+            char dfn[PATH_MAX];  memset(dfn,0,sizeof(dfn));
+            strcpy(&dfn[0],"/usr/lib/debug");
+            strncat(&dfn[0],nm,sizeof(dfn)-1);
+            strncat(&dfn[0],".debug",sizeof(dfn)-1);
+            dprintf(stderr,", %s",&dfn[0]);
+            if( mapMod(&dfn[0],&tsym,mod) < 0 )
+              mod = -1;
+         }
+      }
+      dprintf(stderr,", %d symbols\n",tsym->n - n);
+      if( mod < 0 ) {
+         fprintf(stderr,"profile - Cannot map module - %s\n",nm);
+//         exit(1);
+//         return -1;
+      }
+   }
+
+   /* sort the symbols by address */
+   qsort(&tsym->sym[0],tsym->n,sizeof(tsym->sym[0]),adrCmpr);
+   if( prof_debug != 0 ) {
+      int i; tSym *sp;
+      sp = &tsym->sym[0];
+      for( i=tsym->n; --i>=0; ++sp ) {
+         tMod *mp = &tmod->mod[sp->mod];
+         fprintf(stdout,_LX" %-24s %s\n",sp->adr,
+            &sp->name[0],&mp->name[0]);
+      }
+   }
+   return 0;
+}
+
+/** profile_handler(sign,c)
+ * profile periodic timer signal handler.
+ * decodes pc/fp from sigcontext, and tallys pc (count)
+ *  and stack trace (calls).
+ */
+#define LOW_TEXT 0x01000UL
+
+static void profile_handler(int n, siginfo_t * info, void *sc)
+{
+  ucontext_t *uc = (ucontext_t *)sc;
+  struct sigcontext *c = (struct sigcontext *)&uc->uc_mcontext;
+   struct reg_frame *fp, *last_fp;
+   unsigned long pc;
+   /* tid marks top of thread stack (currently) */
+   unsigned long tid = (unsigned long)pthread_self();
+   ++nTicks;
+   /* tally pc value */
+#ifdef __i386__
+   pc = (unsigned long)c->eip;
+#define ARCH_OK
+#endif
+#ifdef __x86_64__
+   pc = (unsigned long)c->rip;
+#define ARCH_OK
+#endif
+#ifndef ARCH_OK
+#error unknown arch
+#endif
+   if( pc < LOW_TEXT ) return;
+   if( profile_tally(pc,1) != 0 ) return;
+
+   /* access frame pointer and validate */
+#ifdef __i386__
+   fp = (struct reg_frame *)c->ebp;
+   if( (unsigned long)fp < c->esp ) return;
+#endif
+#ifdef __x86_64__
+   fp = (struct reg_frame *)c->rbp;
+   if( (unsigned long)fp < c->rsp ) return;
+#endif
+   if( (unsigned long)fp > prof_stkptr) return;
+   if( (unsigned long)fp > tid) return;
+   dprintf(stderr,"unwind "_LX"",(unsigned long)pc);
+   /* unwind the stack frames, and tally pc values */
+   while( (last_fp=fp) != 0 ) {
+      pc = fp->rf_rtn;
+      dprintf(stderr," "_LX"",(unsigned long)pc);
+      if( pc < LOW_TEXT ) break;
+      if( profile_tally(pc,0) != 0 ) break;
+      fp = (struct reg_frame *)fp->rf_fp;
+      if( ((long)fp & 3) != 0 ) break;
+      if( fp <= last_fp ) break;
+      if( (unsigned long)fp > prof_stkptr ) break;
+      if( (unsigned long)fp > tid ) break;
+   }
+   dprintf(stderr,"\n");
+
+   return;
+}
+
+void profileExit(void)
+{
+   profileStop();
+   profileShow();
+   profileDone();
+}
+
+static void profile_segv(int n, siginfo_t * info, void *sc)
+{
+  ucontext_t *uc = (ucontext_t *)sc;
+  struct sigcontext *c = (struct sigcontext *)&uc->uc_mcontext;
+  profileExit();
+  fprintf(stderr,"segv at 0x"_LX"\n",
+#if __i386__
+    c->eip
+#endif
+#if __x86_64__
+    c->rip
+#endif
+    );
+}
+
+void profileStart(void)
+{
+   char *fn;
+   int typ, sig;
+   struct itimerval it;
+   struct timezone tz;
+   struct sigaction act;
+   struct sigaction segv;
+   unsigned long fwa;
+
+   if( profileActive != 0 ) return;
+
+   if( tmod == NULL || tsym == NULL || tmap == NULL ) {
+      setbuf(stderr,NULL);
+      dprintf(stderr,"start profile\n");
+      delAllTbls();
+      unsetenv("LD_PRELOAD");
+      profileDone();
+      fn = (char *)&prof_output[0];
+      if( strcmp("-",&fn[0]) == 0 )
+         prof_fp = stdout;
+      else if( strcmp("--",&fn[0]) == 0 )
+         prof_fp = stderr;
+      else
+         prof_fp = fopen(&fn[0],"w");
+      if( prof_fp == NULL ) {
+         perror(&fn[0]);
+         fprintf(stderr,"profile: no output path\n");
+         exit(1);
+      }
+      tmap = newMapTbl();  fwa = 0;
+      if( tmap != NULL && readProcMaps(&fwa) == 0 ) {
+         tmod = newModTbl();  tsym = newSymTbl();
+         if( tmod == NULL || tsym == NULL || readNmMaps(fwa) != 0 ) {
+            fprintf(stderr,"profile: unable to read nm maps\n");
+            delModTbl(&tmod);  delSymTbl(&tsym);
+         }
+      }
+      else {
+         fprintf(stderr,"profile: unable to read proc maps\n");
+         delMapTbl(&tmap);
+      }
+   }
+   if( tmap == NULL || tmod == NULL || tsym == NULL ) {
+      delAllTbls();
+      return;
+   }
+
+   switch( prof_type ) {
+   case 1:  typ = ITIMER_VIRTUAL;  sig = SIGVTALRM;  break;
+   case 2:  typ = ITIMER_REAL;     sig = SIGALRM;    break;
+   default: typ = ITIMER_PROF;     sig = SIGPROF;    break;
+   }
+
+   /* record the start time (cpu/real). */
+   times(&start_cpu);
+   gettimeofday(&start_clk,&tz);
+
+   /* enable the profile timer signal handler. */
+   profileActive = 1;
+   memset(&act,0,sizeof(act));
+   act.sa_sigaction = profile_handler;
+   act.sa_flags = SA_RESTART + SA_SIGINFO;
+   sigaction(sig, &act, &oldSig);
+   memset(&segv,0,sizeof(segv));
+   segv.sa_sigaction = profile_segv;
+   segv.sa_flags = SA_SIGINFO;
+   sigaction(SIGSEGV,&segv,&oldSegv);
+
+   /* start the periodic profile timer signal */
+   if( prof_tmrval == 0 ) prof_tmrval = 1;
+   it.it_value.tv_sec = 
+   it.it_interval.tv_sec = prof_tmrval / 1000000;
+   it.it_value.tv_usec =
+   it.it_interval.tv_usec = prof_tmrval % 1000000;
+   setitimer(typ, &it, NULL);
+   dprintf(stderr,"starting profile.\n");
+}
+
+int profileMain(int ac,char **av,char **ev)
+{
+   int (*fmain)(int ac,char **av,char **ev);
+   unsigned long adr;
+   profileStart();
+   if( findSymAdr(tsym,"main",&adr) != 0 ) {
+     fprintf(stderr,"cant locate sym \"main\"\n");
+     exit(1);
+   }
+   atexit(profileExit);
+   fmain = (int (*)(int,char **,char **))adr;
+   dprintf(stderr,"starting \"main\" at: %p\n",fmain);
+   int ret = fmain(ac,av,ev);
+   dprintf(stderr,"ended \"main\" = %d\n",ret);
+   exit(ret);
+}
+
+void profileStop(void)
+{
+   struct itimerval it;
+   struct timezone tz;
+   struct sigaction act;
+
+   if( profileActive == 0 ) return;
+   dprintf(stderr,"stopping profile.\n");
+
+   /* records the stop time (cpu/real). */
+   times(&stop_cpu);
+   gettimeofday(&stop_clk,&tz);
+
+   /* disables the profile timer signal handler. */
+   it.it_interval.tv_sec = 0;
+   it.it_interval.tv_usec = 0;
+   it.it_value.tv_sec = 0;
+   it.it_value.tv_usec = 0;
+   setitimer(ITIMER_PROF, &it, NULL);
+
+   /* restore the original profile signal handler. */
+   sigaction(SIGPROF, &oldSig, &act);
+   sigaction(SIGSEGV, &oldSegv, &act);
+   profileActive = 0;
+   return;
+}
+
+
+void profileClear(void)
+{
+   int i;
+   nTicks = 0;
+   if( tsym != NULL ) {
+      tSym *sp = &tsym->sym[0];
+      for( i=tsym->n; --i>=0; ++sp ) {
+         sp->count = sp->calls = 0;
+         sp->tick = sp->tcalls = 0;
+      }
+   }
+   if( tmod != NULL ) {
+      tMod *mp = &tmod->mod[0];
+      for( i=tmod->n; --i>=0; ++mp )
+         mp->count = mp->calls = 0;
+   }
+} 
+
+
+void profileShow(void)
+{
+   FILE *fp; int i;
+   double userDt, systDt;
+   double tickDt, realDt;
+   if( tsym == NULL || tmod == NULL ) return;
+   fp = prof_fp;
+   qsort(&tsym->sym[0],tsym->n,sizeof(tsym->sym[0]),cntCmpr);
+   /* outputs sorted (by count) list of functions called. */
+   fprintf(fp,"---- profile start ----\n");
+   fprintf(fp," %d ticks %d modules %d syms\n",nTicks,tmod->n,tsym->n);
+   tSym *sp = &tsym->sym[0];
+   for( i=tsym->n; --i>=0; ++sp ) {
+      if( !sp->count ) continue;
+      tMod *mp = &tmod->mod[sp->mod];
+      fprintf(fp,"%8.3fs %5.1f%% %-24s %s\n",
+        prof_tmrval*sp->count/1000000.0,
+        sp->count*100.0/nTicks,&sp->name[0],
+        &mp->name[0]);
+   }
+
+   qsort(&tsym->sym[0],tsym->n,sizeof(tsym->sym[0]),tclCmpr);
+   /* outputs sorted (by calls) list of functions called. */
+   fprintf(fp,"---- profile calls ----\n");
+   sp = &tsym->sym[0];
+   for( i=tsym->n; --i>=0; ++sp ) {
+      if( !sp->tcalls ) continue;
+      tMod *mp = &tmod->mod[sp->mod];
+      fprintf(fp,"%8.3fs %5.1f%% %-24s %5.1f %s\n",
+        prof_tmrval*sp->tcalls/1000000.0,
+        sp->tcalls*100.0/nTicks,&sp->name[0],
+        (double)sp->calls/sp->tcalls,&mp->name[0]);
+   }
+
+   realDt = ((stop_clk.tv_sec - start_clk.tv_sec) * 1000000.0 +
+               (stop_clk.tv_usec - start_clk.tv_usec) ) / 1000000.0;
+   /* output sorted (by count) list of modules called. */
+   qsort(&tmod->mod[0],tmod->n,sizeof(tmod->mod[0]),modCmpr);
+   fprintf(fp,"----\n");
+   tMod *mp = &tmod->mod[0];
+   for( i=tmod->n; --i>=0; ++mp ) {
+      if( mp->count != 0 && mp->name != NULL ) {
+         double dt = prof_tmrval*mp->count/1000000.0;
+         fprintf(fp,"%8.3fs %5.1f%%/%5.1f%% %s\n",
+            dt,mp->count*100.0/nTicks,dt*100.0/realDt,mp->name);
+      }
+   }
+
+   /* output tick time, cpu user/kernal time, real time. */
+   tickDt = prof_tmrval*nTicks / 1000000.0;
+   userDt = (stop_cpu.tms_utime - start_cpu.tms_utime) / (double)CLOCKS_PER_SEC;
+   systDt = (stop_cpu.tms_stime - start_cpu.tms_stime) / (double)CLOCKS_PER_SEC;
+
+   fprintf(fp,"%8.3ft %0.3fu+%0.3fs %0.3fr %5.1f%%\n",
+      tickDt, userDt, systDt, realDt, tickDt*100.0/realDt);
+   fprintf(fp,"---- profile end ----\n\n");
+   qsort(&tsym->sym[0],tsym->n,sizeof(tsym->sym[0]),adrCmpr);
+}
+
+void profileDone(void)
+{
+   profileStop();
+   delModTbl(&tmod);
+   delSymTbl(&tsym);
+   if( prof_fp != NULL && prof_fp != stdout && prof_fp != stderr ) {
+      fclose(prof_fp);  prof_fp = NULL;
+   }
+}
+