Unix操作系统上如何编程获取进程的内存、CPU利用状况?

读写proc文件系统即可

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发表于 2003-03-12 00:21 |只看该作者

Unix操作系统上如何编程获取进程的内存、CPU利用状况?

进程的存储信息可用下面的函数调用查看，如果你的系统有着个系统调用的话。
int getrusage(int who, struct rusage *r_usage);
读取进程表的程序如下。可以参考一下
SUNOS 版本
#define _KMEMUSER
   #include <sys/proc.h>;
   #include <kvm.h>;
   #include <fcntl.h>;

   char regexpstr[256];
   #define INIT          register char *sp=regexpstr;
   #define GETC()       (*sp++)
   #define PEEKC()       (*sp)
   #define UNGETC(c)    (--sp)
   #define RETURN(pointer) return(pointer);
   #define ERROR(val)
   #include <regexp.h>;

   pid_t
   getpidbyname(char *name,pid_t skipit)
   {
      kvm_t *kd;
      char **arg;
      int error;
      char *p_name=NULL;
      char expbuf[256];
      char **freeme;
      int curpid;
      struct user * cur_user;
      struct user myuser;
      struct proc * cur_proc;

      if((kd=kvm_open(NULL,NULL,NULL,O_RDONLY,NULL))==NULL){
         return(-1);
      }
      sprintf(regexpstr,"^.*/%s$",name);
      compile(NULL,expbuf,expbuf+256,'\0');

      while(cur_proc=kvm_nextproc(kd)){
         curpid = cur_proc->;p_pid;
         if((cur_user=kvm_getu(kd,cur_proc))!=NULL){
               error=kvm_getcmd(kd,cur_proc,cur_user,&arg,NULL);
               if(error==-1){
                  if(cur_user->;u_comm[0]!='\0'){
                     p_name=cur_user->;u_comm;
                  }
               }
               else{
                  p_name=arg[0];
               }
         }
         if(p_name){
               if(!strcmp(p_name,name)){
                  if(error!=-1){
                     free(arg);
                  }
                  if(skipit!=-1 && ourretval==skipit){
                     ourretval=-1;
                  }
                  else{
                     close(fd);
                     break;
                  }
                  break;
               }
               else{
                  if(step(p_name,expbuf)){
                     if(error!=-1){
                           free(arg);
                     }
                     break;
                  }
               }
         }
         if(error!=-1){
               free(arg);
         }
         p_name=NULL;
      }
      kvm_close(kd);
      if(p_name!=NULL){
         return(curpid);
      }
      return (-1);
   }
SYSV版本
pid_t
   getpidbyname(char *name,pid_t skipit)
   {
      DIR  *dp;
      struct dirent *dirp;
      prpsinfo_t retval;
      int fd;
      pid_t ourretval=-1;

      if((dp=opendir("/proc"

)==NULL){
         return -1;
      }
      chdir("/proc"

;
      while((dirp=readdir(dp))!=NULL){
         if(dirp->;d_name[0]!='.'){
               if((fd=open(dirp->;d_name,O_RDONLY))!=-1){
                  if(ioctl(fd,PIOCPSINFO,&retval)!=-1){
                     if(!strcmp(retval.pr_fname,name)){
                           ourretval=(pid_t)atoi(dirp->;d_name);
                           if(skipit!=-1 && ourretval==skipit){
                              ourretval=-1;
                           }
                           else{
                              close(fd);
                              break;
                           }
                     }
                  }
                  close(fd);
               }
         }
      }
      closedir(dp);
      return ourretval;
   }
AIX版本
#include <stdio.h>;
   #include <procinfo.h>;

   int getprocs(struct procsinfo *, int, struct fdsinfo *,
               int, pid_t *, int);

   pid_t getpidbyname(char *name, pid_t *nextPid)
   {
   struct procsinfo  pi;
   pid_t          retval = (pid_t) -1;
   pid_t          pid;

   pid = *nextPid;

   while(1)
   {
      if(getprocs(&pi, sizeof pi, 0, 0, &pid, 1) != 1)
         break;

      if(!strcmp(name, pi.pi_comm))
      {
         retval = pi.pi_pid;
         *nextPid = pid;
         break;
      }
   }

   return retval;
   }

   int main(int argc, char *argv[])
   {
   int curArg;
   pid_t pid;
   pid_t nextPid;

   if(argc == 1)
   {
      printf("syntax: %s <program>; [program ...]\n",argv[0]);
      exit(1);
   }

   for(curArg = 1; curArg < argc; curArg++)
   {
      printf("

rocess IDs for %s\n", argv[curArg]);

      for(nextPid = 0, pid = 0; pid != -1; )
         if((pid = getpidbyname(argv[curArg], &nextPid)) != -1)
         printf("\t%d\n", pid);
   }
   }