ps_systemv.c

进程列表程序

pid_tgetpidbyname(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;
}