void
get_ps_data(void)
{
ps_ldata_t *ps_last = PS_LNULL;
ps_ldata_t *ps_head = PS_LNULL;
ps_ldata_t *psp;
ps_data_t *pstp;
static char *usrname;
int i = 0;
DIR *dirp;
struct dirent *dentp;
char pname[MAXNAMELEN];
int pdlen;
char *gettty();
if (pstable != PS_NULL) { /* Don't run ps unless we need to */
if ((cache_now - ps_cache_time) <= cache_lifetime)
return;
free(pstable);
}
pstable_lines = 0;
ps_cache_time = cache_now;
/*
* Determine root path for remote machine.
*/
if (!readata()) { /* get data from psfile */
call_ftw_for_dev();
wrdata();
}
/*
* Determine which processes to print info about by searching
* the /proc directory and looking at each process.
*/
if ((dirp = opendir(procdir)) == NULL) {
(void) SYSLOG0("Cannot open PROC directory\n");
return;
}
(void) strcpy(pname, procdir);
pdlen = strlen(pname);
pname[pdlen++] = '/';
/* for each active process --- */
while (dentp = readdir(dirp)) {
int procfd;
if (dentp->d_name[0] == '.') /* skip . and .. */
continue;
(void) strcpy(pname + pdlen, dentp->d_name);
retry:
if ((procfd = open(pname, O_RDONLY)) == -1)
continue;
/*
* Get the info structure for the process and close quickly.
*/
if (ioctl(procfd, PIOCPSINFO, (char *)&info) == -1) {
int saverr = errno;
(void) close(procfd);
if (saverr == EAGAIN)
goto retry;
if (saverr != ENOENT)
(void) SYSLOG2("PIOCPSINFO on %s: %s\n",
pname, strerror(saverr));
continue;
}
(void) close(procfd);
if ((psp = (ps_ldata_t *)malloc(sizeof (ps_ldata_t))) == PS_LNULL)
break;
memset((char *)psp, 0, sizeof (ps_ldata_t));
psp->pdata.uid = info.pr_uid;
psp->pdata.pid = info.pr_pid;
psp->pdata.ppid = info.pr_ppid;
psp->pdata.sz = info.pr_size;
if (info.pr_wchan)
sprintf(psp->pdata.wchan, "%9x", info.pr_wchan);
else
strcpy(psp->pdata.wchan, " ");
memset(&psp->pdata.stat[0], 0, STAT_SZ+1);
if (info.pr_sname)
psp->pdata.stat[0] = info.pr_sname;
i = 0;
strcpy(psp->pdata.tty, (char *)gettty(&i));
psp->pdata.cpu = info.pr_time.tv_sec;
strcpy(psp->pdata.cmd, info.pr_fname);
if ((usrname = (get_usr_name(psp->pdata.uid))) != NULL)
strncpy(psp->pdata.usrname, usrname, USRNM_SZ);
else {
free(psp);
continue;
}
psp->pdata.usrname[USRNM_SZ] = '\0';
pstable_lines++;
if (ps_last == PS_LNULL)
ps_head = psp;
else
ps_last->link = psp;
ps_last = psp;
}
(void) closedir(dirp);
if ((pstable = (ps_data_t *)malloc(pstable_lines
* sizeof (ps_data_t))) == PS_NULL) {
clean_ps(ps_head);
return;
}
for (pstp = pstable, psp = ps_head; psp != PS_LNULL;
pstp++, psp = psp->link) {
memcpy((char *)pstp, (char *)&(psp->pdata), sizeof (ps_data_t));
}
clean_ps(ps_head);
qsort(pstable, pstable_lines, sizeof (ps_data_t), (int (*)())pscomp);
}
void statement(unsigned long long fsys)
{
long i,cx1,cx2;
switch(sym)
{
case ident: // 以标识符开始，则为赋值语句
{
i=position(id);
if(i==0) error(11);
else if( table[i].kind!=integer&&table[i].kind!=real&&
table[i].kind!=boolean)// 非变量
{
error(12);
i=0;
}
getsym();
if(sym==becomes) getsym();
else error(13);
simpexpression(fsys);
if(i!=0)
{
if (table[i].kind==boolean) gen(opr,0,21);
// 对boolean变量进行数值整理
gen(sto,lev-table[i].level,table[i].addr);
}
} break;
case callsym: // 调用语句
{
getsym();
if(sym!=ident)
{
error(14);
}
else
{
i=position(id);
if(i==0)
{
error(11);
}
else if(table[i].kind==proc)
{
gen(cal,lev-table[i].level,table[i].addr);
}
else
{
error(15);
}
getsym();
}
} break;
case ifsym: // if语句
{
getsym();
expression(fsys|thensym|dosym);
if(sym==thensym)
{
getsym();
}
else
{
error(16);
}
cx1=cx; // 记录下跳转代码的位置，此时跳转地址是0
gen(jpc,0,0);
statement(fsys|elsesym);// 紧接着可能是else
code[cx1].a=cx; // 把跳转地址加上
if (sym==elsesym) // else子句
{
cx1=cx; // 记录下跳转代码的位置
gen(jmp,0,0); // 如果有else，那么then后面部分执行完毕后要跳过这段
getsym();
statement(fsys);
code[cx1].a=cx;
}
} break;
case beginsym: // begin语句
{
getsym();
statement(fsys|semicolon|endsym);
while(sym==semicolon||(sym&statbegsys))
{
if(sym==semicolon)
{
getsym();
}
else
{
error(10);
}
statement(fsys|semicolon|endsym);
}
if(sym==endsym) getsym();
else error(17);
} break;
case whilesym: // while语句
{
cx1=cx; getsym();
expression(fsys|dosym);
cx2=elx; // 记录下当前层开始的elx
exitlist[elx]=cx; // 将jpc的位置记录进exitlist
elx++;
gen(jpc,0,0);
if(sym==dosym)
{
getsym();
}
else
{
error(18);
}
statement(fsys|exitsym);
gen(jmp,0,cx1);
while(elx>cx2) // 将exitlist中记录下的跳转语句的地址补充完整
{
elx--;
code[exitlist[elx]].a=cx;
}
} break;
case elsesym: // else语句
{
test(fsys,0,33); // 具体的处理已经在if中完成了，这里只要判错即可
} break;
case exitsym: // exit语句
{
test(fsys,0,34); // exit语句报错处理
exitlist[elx]=cx; // 将jpc的位置记录进exitlist
elx++;
gen(jmp,0,0);
getsym();
} break;
case readsym: // read语句
{
getsym();
if (sym==lparen) getsym();
else error(35);
readata();
while(sym==comma)
{
getsym();
readata();
}
if (sym==rparen) getsym();
else error(22);
} break;
case writesym: // write语句
{
getsym();
if (sym==lparen) getsym();
else error(35);
expression(fsys|comma|rparen);
gen(opr,0,14);
while(sym==comma)
{
getsym();
expression(fsys|comma|rparen);
gen(opr,0,14);
}
if (sym==rparen) getsym();
else error(22);
} break;
}
test(fsys,0,19);
}