219 lines
5.3 KiB
C
219 lines
5.3 KiB
C
/*
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* readprofile.c - used to read /proc/profile
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*
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* Copyright (C) 1994,1996 Alessandro Rubini (rubini@ipvvis.unipv.it)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#define RELEASE "2.0, May 1996"
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#define S_LEN 128
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static char *prgname;
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/* These are the defaults */
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static char defaultmap[]="/usr/src/linux/System.map";
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static char defaultpro[]="/proc/profile";
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static char optstring[]="m:p:itvarV";
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void usage()
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{
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fprintf(stderr,
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"%s: Usage: \"%s [options]\n"
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"\t -m <mapfile> (default = \"%s\")\n"
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"\t -p <pro-file> (default = \"%s\")\n"
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"\t -i print only info about the sampling step\n"
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"\t -v print verbose data\n"
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"\t -a print all symbols, even if count is 0\n"
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"\t -r reset all the counters (root only)\n"
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"\t -V print version and exit\n"
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,prgname,prgname,defaultmap,defaultpro);
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exit(1);
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}
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FILE *myopen(char *name, char *mode, int *flag)
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{
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static char cmdline[S_LEN];
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if (!strcmp(name+strlen(name)-3,".gz"))
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{
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*flag=1;
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sprintf(cmdline,"zcat %s", name);
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return popen(cmdline,mode);
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}
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*flag=0;
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return fopen(name,mode);
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}
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int main (int argc, char **argv)
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{
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FILE *pro;
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FILE *map;
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int proFd;
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char *mapFile, *proFile;
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unsigned int len, add0=0, step, index=0;
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unsigned int *buf, total, fn_len;
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unsigned int fn_add, next_add; /* current and next address */
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char fn_name[S_LEN], next_name[S_LEN]; /* current and next name */
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char mode[8];
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int c;
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int optAll=0, optInfo=0, optReset=0, optVerbose=0;
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char mapline[S_LEN];
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int maplineno=1;
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int popenMap; /* flag to tell if popen() has been used */
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#define next (current^1)
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prgname=argv[0];
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proFile=defaultpro;
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mapFile=defaultmap;
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while ((c=getopt(argc,argv,optstring))!=-1)
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{
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switch(c)
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{
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case 'm': mapFile=optarg; break;
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case 'p': proFile=optarg; break;
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case 'a': optAll++; break;
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case 'i': optInfo++; break;
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case 'r': optReset++; break;
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case 'v': optVerbose++; break;
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case 'V': printf("%s Version %s\n",prgname,RELEASE); exit(0);
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default: usage();
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}
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}
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if (optReset)
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{
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/* try to become root, just in case */
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setuid(0);
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pro=fopen(defaultpro,"w");
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if (!pro)
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{perror(proFile); exit(1);}
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fprintf(pro,"anything\n");
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fclose(pro);
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exit(0);
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}
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/*
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* Use an fd for the profiling buffer, to skip stdio overhead
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*/
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if ( ((proFd=open(proFile,O_RDONLY)) < 0)
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|| ((len=lseek(proFd,0,SEEK_END)) < 0)
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|| (lseek(proFd,0,SEEK_SET)<0) )
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{
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fprintf(stderr,"%s: %s: %s\n",prgname,proFile,strerror(errno));
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exit(1);
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}
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if ( !(buf=malloc(len)) )
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{ fprintf(stderr,"%s: malloc(): %s\n",prgname, strerror(errno)); exit(1); }
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if (read(proFd,buf,len) != len)
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{
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fprintf(stderr,"%s: %s: %s\n",prgname,proFile,strerror(errno));
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exit(1);
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}
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close(proFd);
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step=buf[0];
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if (optInfo)
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{
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printf("Sampling_step: %i\n",step);
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exit(0);
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}
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total=0;
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if (!(map=myopen(mapFile,"r",&popenMap)))
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{fprintf(stderr,"%s: ",prgname);perror(mapFile);exit(1);}
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while(fgets(mapline,S_LEN,map))
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{
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if (sscanf(mapline,"%x %s %s",&fn_add,mode,fn_name)!=3)
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{
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fprintf(stderr,"%s: %s(%i): wrong map line\n",
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prgname,mapFile, maplineno);
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exit(1);
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}
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if (strcmp(fn_name,"_stext")) /* only elf works like this */
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{
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add0=fn_add;
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break;
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}
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}
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if (!add0)
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{
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fprintf(stderr,"%s: can't find \"_stext\" in %s\n",prgname, mapFile);
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exit(1);
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}
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/*
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* Main loop.
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*/
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while(fgets(mapline,S_LEN,map))
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{
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unsigned int this=0;
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if (sscanf(mapline,"%x %s %s",&next_add,mode,next_name)!=3)
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{
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fprintf(stderr,"%s: %s(%i): wrong map line\n",
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prgname,mapFile, maplineno);
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exit(1);
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}
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if (*mode!='T' && *mode!='t') break; /* only text is profiled */
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while (index < (next_add-add0)/step)
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this += buf[index++];
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total += this;
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fn_len = next_add-fn_add;
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if (fn_len && (this || optAll))
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{
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if (optVerbose)
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printf("%08x %-40s %6i %8.4f\n",
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fn_add,fn_name,this,this/(double)fn_len);
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else
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printf("%6i %-40s %8.4f\n",
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this,fn_name,this/(double)fn_len);
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}
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fn_add=next_add; strcpy(fn_name,next_name);
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}
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/* trailer */
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if (optVerbose)
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printf("%08x %-40s %6i %8.4f\n",
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0,"total",total,total/(double)(fn_add-add0));
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else
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printf("%6i %-40s %8.4f\n",
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total,"total",total/(double)(fn_add-add0));
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popenMap ? pclose(map) : fclose(map);
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exit(0);
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}
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