ref: 7a503757b1251c2746df7bdcd891814c1518cc28
dir: /sys/src/cmd/upas/q/runq.c/
#include "common.h"
#include <ctype.h>
typedef struct Job Job;
typedef struct Wdir Wdir;
typedef struct Wpid Wpid;
struct Wdir {
Dir *d;
int nd;
char *name;
};
struct Job {
Job *next;
int pid;
int ac;
int dfd;
char **av;
char *buf; /* backing for av */
Wdir *wdir; /* work dir */
Dir *dp; /* not owned */
Mlock *l;
Biobuf *b;
};
void doalldirs(void);
void dodir(char*);
Job* dofile(Wdir*, Dir*);
Job* donefile(Job*, Waitmsg*);
void freejob(Job*);
void rundir(char*);
char* file(char*, char);
void warning(char*, void*);
void error(char*, void*);
int returnmail(char**, Wdir*, char*, char*);
void logit(char*, Wdir*, char*, char**);
void doload(int);
char *cmd;
char *root;
int debug;
int giveup = 2*24*60*60;
int limit;
Wpid *waithd;
Wpid *waittl;
char *runqlog = "runq";
char **badsys; /* array of recalcitrant systems */
int nbad;
int njob = 1; /* number of concurrent jobs to invoke */
int Eflag; /* ignore E.xxxxxx dates */
int Rflag; /* no giving up, ever */
int aflag; /* do all dirs */
void
usage(void)
{
fprint(2, "usage: runq [-dE] [-q dir] [-l load] [-t time] [-r nfiles] [-n nprocs] q-root cmd\n");
exits("usage");
}
void
main(int argc, char **argv)
{
char *qdir;
qdir = 0;
ARGBEGIN{
case 'E':
Eflag++;
break;
case 'R': /* no giving up -- just leave stuff in the queue */
Rflag++;
break;
case 'd':
debug++;
break;
case 'r':
limit = atoi(EARGF(usage()));
break;
case 't':
giveup = 60*60*atoi(EARGF(usage()));
break;
case 'q':
qdir = EARGF(usage());
break;
case 'a':
aflag++;
break;
case 'n':
njob = atoi(EARGF(usage()));
if(njob == 0)
usage();
break;
default:
usage();
break;
}ARGEND;
if(argc != 2)
usage();
if(!aflag && qdir == nil){
qdir = getuser();
if(qdir == nil)
error("unknown user", 0);
}
root = argv[0];
cmd = argv[1];
if(chdir(root) < 0)
error("can't cd to %s", root);
if(aflag)
doalldirs();
else
dodir(qdir);
exits(0);
}
int
emptydir(char *name)
{
int fd;
long n;
char buf[2048];
fd = open(name, OREAD);
if(fd < 0)
return 1;
n = read(fd, buf, sizeof(buf));
close(fd);
if(n <= 0) {
if(debug)
fprint(2, "removing directory %s\n", name);
syslog(0, runqlog, "rmdir %s", name);
remove(name);
return 1;
}
return 0;
}
/*
* run all user directories, must be bootes (or root on unix) to do this
*/
void
doalldirs(void)
{
Dir *db;
int fd;
long i, n;
if((fd = open(".", OREAD)) == -1){
warning("opening %s", root);
return;
}
if((n = dirreadall(fd, &db)) == -1){
warning("reading %s: ", root);
close(fd);
return;
}
for(i=0; i<n; i++){
if((db[i].qid.type & QTDIR) == 0)
continue;
if(emptydir(db[i].name))
continue;
dodir(db[i].name);
}
close(fd);
free(db);
}
/*
* cd to a user directory and run it
*/
void
dodir(char *name)
{
if(chdir(name) < 0){
warning("cd to %s", name);
return;
}
if(debug)
fprint(2, "running %s\n", name);
rundir(name);
chdir("..");
}
/*
* run the current directory
*/
void
rundir(char *name)
{
int nlive, fidx, fd, found;
Job *hd, *j, **p;
Waitmsg *w;
Mlock *l;
Wdir wd;
fd = open(".", OREAD);
if(fd == -1){
warning("reading %s", name);
return;
}
if((l = syslock("./rundir")) == nil){
warning("locking %s", name);
close(fd);
return;
}
fidx= 0;
hd = nil;
nlive = 0;
wd.name = name;
wd.nd = dirreadall(fd, &wd.d);
while(nlive > 0 || fidx< wd.nd){
for(; fidx< wd.nd && nlive < njob; fidx++){
if(strncmp(wd.d[fidx].name, "C.", 2) != 0)
continue;
if((j = dofile(&wd, &wd.d[fidx])) == nil){
if(debug) fprint(2, "skipping %s: %r\n", wd.d[fidx].name);
continue;
}
nlive++;
j->next = hd;
hd = j;
}
/* nothing to do */
if(nlive == 0)
break;
rescan:
if((w = wait()) == nil){
syslog(0, "runq", "wait error: %r");
break;
}
found = 0;
for(p = &hd; *p != nil; p = &(*p)->next){
if(w->pid == (*p)->pid){
*p = donefile(*p, w);
found++;
nlive--;
break;
}
}
free(w);
if(!found){
syslog(0, runqlog, "wait: pid not in job list");
goto rescan;
}
}
assert(hd == nil);
free(wd.d);
close(fd);
sysunlock(l);
}
/*
* free files matching name in the current directory
*/
void
remmatch(Wdir *w, char *name)
{
long i;
syslog(0, runqlog, "removing %s/%s", w->name, name);
for(i=0; i<w->nd; i++){
if(strcmp(&w->d[i].name[1], &name[1]) == 0)
remove(w->d[i].name);
}
/* error file (may have) appeared after we read the directory */
/* stomp on data file in case of phase error */
remove(file(name, 'D'));
remove(file(name, 'E'));
}
/*
* like trylock, but we've already got the lock on fd,
* and don't want an L. lock file.
*/
static Mlock *
keeplockalive(char *path, int fd)
{
char buf[1];
Mlock *l;
l = malloc(sizeof(Mlock));
if(l == 0)
return 0;
l->fd = fd;
snprint(l->name, sizeof l->name, "%s", path);
/* fork process to keep lock alive until sysunlock(l) */
switch(l->pid = rfork(RFPROC|RFNOWAIT)){
default:
break;
case 0:
fd = l->fd;
for(;;){
sleep(1000*60);
if(pread(fd, buf, 1, 0) < 0)
break;
}
_exits(0);
}
return l;
}
/*
* Launch trying a message, returning a job
* tracks the running pid.
*/
Job*
dofile(Wdir *w, Dir *dp)
{
int dtime, efd, i, etime;
Job *j;
Dir *d;
char *cp;
if(debug) fprint(2, "dofile %s\n", dp->name);
/*
* if no data file or empty control or data file, just clean up
* the empty control file must be 15 minutes old, to minimize the
* chance of a race.
*/
d = dirstat(file(dp->name, 'D'));
if(d == nil){
syslog(0, runqlog, "no data file for %s", dp->name);
remmatch(w, dp->name);
return nil;
}
if(dp->length == 0){
if(time(0)-dp->mtime > 15*60){
syslog(0, runqlog, "empty ctl file for %s", dp->name);
remmatch(w, dp->name);
}
return nil;
}
dtime = d->mtime;
free(d);
/*
* retry times depend on the age of the errors file
*/
if(!Eflag && (d = dirstat(file(dp->name, 'E'))) != nil){
etime = d->mtime;
free(d);
if(etime - dtime < 60*60){
/* up to the first hour, try every 15 minutes */
if(time(0) - etime < 15*60){
werrstr("early retry");
return nil;
}
} else {
/* after the first hour, try once an hour */
if(time(0) - etime < 60*60){
werrstr("early retry");
return nil;
}
}
}
/*
* open control and data
*/
j = malloc(sizeof(Job));
if(j == nil)
return nil;
memset(j, 0, sizeof(Job));
j->dp = dp;
j->dfd = -1;
j->b = sysopen(file(dp->name, 'C'), "rl", 0660);
if(j->b == 0)
goto done;
j->dfd = open(file(dp->name, 'D'), OREAD);
if(j->dfd < 0)
goto done;
/*
* make arg list
* - read args into (malloc'd) buffer
* - malloc a vector and copy pointers to args into it
*/
j->wdir = w;
j->buf = malloc(dp->length+1);
if(j->buf == nil){
warning("buffer allocation", 0);
freejob(j);
return nil;
}
if(Bread(j->b, j->buf, dp->length) != dp->length){
warning("reading control file %s\n", dp->name);
freejob(j);
return nil;
}
j->buf[dp->length] = 0;
j->av = malloc(2*sizeof(char*));
if(j->av == 0){
warning("argv allocation", 0);
freejob(j);
return nil;
}
for(j->ac = 1, cp = j->buf; *cp; j->ac++){
while(isspace(*cp))
*cp++ = 0;
if(*cp == 0)
break;
j->av = realloc(j->av, (j->ac+2)*sizeof(char*));
if(j->av == 0){
warning("argv allocation", 0);
}
j->av[j->ac] = cp;
while(*cp && !isspace(*cp)){
if(*cp++ == '"'){
while(*cp && *cp != '"')
cp++;
if(*cp)
cp++;
}
}
}
j->av[0] = cmd;
j->av[j->ac] = 0;
if(!Eflag &&time(0) - dtime > giveup){
if(returnmail(j->av, w, dp->name, "Giveup") != 0)
logit("returnmail failed", w, dp->name, j->av);
remmatch(w, dp->name);
goto done;
}
for(i = 0; i < nbad; i++){
if(j->ac > 3 && strcmp(j->av[3], badsys[i]) == 0){
werrstr("badsys: %s", j->av[3]);
goto done;
}
}
/*
* Ken's fs, for example, gives us 5 minutes of inactivity before
* the lock goes stale, so we have to keep reading it.
*/
j->l = keeplockalive(file(dp->name, 'C'), Bfildes(j->b));
if(j->l == nil){
warning("lock file", 0);
goto done;
}
/*
* transfer
*/
j->pid = fork();
switch(j->pid){
case -1:
sysunlock(j->l);
sysunlockfile(Bfildes(j->b));
syslog(0, runqlog, "out of procs");
exits(0);
case 0:
if(debug) {
fprint(2, "Starting %s\n", cmd);
for(i = 0; j->av[i]; i++)
fprint(2, " %s", j->av[i]);
fprint(2, "\n");
}
logit("execing", w, dp->name, j->av);
close(0);
dup(j->dfd, 0);
close(j->dfd);
close(2);
efd = open(file(dp->name, 'E'), OWRITE);
if(efd < 0){
if(debug)
syslog(0, "runq", "open %s as %s: %r", file(dp->name,'E'), getuser());
efd = create(file(dp->name, 'E'), OWRITE, 0666);
if(efd < 0){
if(debug) syslog(0, "runq", "create %s as %s: %r", file(dp->name, 'E'), getuser());
exits("could not open error file - Retry");
}
}
seek(efd, 0, 2);
exec(cmd, j->av);
error("can't exec %s", cmd);
break;
default:
return j;
}
done:
freejob(j);
return nil;
}
/*
* Handle the completion of a job.
* Wait for the pid, check its status,
* and then pop the job off the list.
* Return the next running job.
*/
Job*
donefile(Job *j, Waitmsg *wm)
{
Job *n;
if(debug)
fprint(2, "wm->pid %d wm->msg == %s\n", wm->pid, wm->msg);
if(wm->msg[0]){
if(debug)
fprint(2, "[%d] wm->msg == %s\n", getpid(), wm->msg);
if(!Rflag && strstr(wm->msg, "Retry")==0){
/* return the message and remove it */
if(returnmail(j->av, j->wdir, j->dp->name, wm->msg) != 0)
logit("returnmail failed", j->wdir, j->dp->name, j->av);
remmatch(j->wdir, j->dp->name);
} else {
/* add sys to bad list and try again later */
nbad++;
badsys = realloc(badsys, nbad*sizeof(char*));
badsys[nbad-1] = strdup(j->av[3]);
}
} else {
/* it worked remove the message */
remmatch(j->wdir, j->dp->name);
}
n = j->next;
freejob(j);
return n;
}
/*
* Release resources associated with
* a job.
*/
void
freejob(Job *j)
{
if(j->b != nil){
sysunlockfile(Bfildes(j->b));
Bterm(j->b);
}
if(j->dfd != -1)
close(j->dfd);
if(j->l != nil)
sysunlock(j->l);
free(j->buf);
free(j->av);
free(j);
}
/*
* return a name starting with the given character
*/
char*
file(char *name, char type)
{
static char nname[Elemlen+1];
strncpy(nname, name, Elemlen);
nname[Elemlen] = 0;
nname[0] = type;
return nname;
}
/*
* send back the mail with an error message
*
* return 0 if successful
*/
int
returnmail(char **av, Wdir *w, char *name, char *msg)
{
char buf[256], attachment[Pathlen], *sender;
int fd, pfd[2];
long n;
String *s;
if(av[1] == 0 || av[2] == 0){
logit("runq - dumping bad file", w, name, av);
return 0;
}
s = unescapespecial(s_copy(av[2]));
sender = s_to_c(s);
if(!returnable(sender) || strcmp(sender, "postmaster") == 0) {
logit("runq - dumping p to p mail", w, name, av);
return 0;
}
if(pipe(pfd) < 0){
logit("runq - pipe failed", w, name, av);
return -1;
}
switch(rfork(RFFDG|RFPROC|RFENVG|RFNOWAIT)){
case -1:
logit("runq - fork failed", w, name, av);
return -1;
case 0:
logit("returning", w, name, av);
close(pfd[1]);
close(0);
dup(pfd[0], 0);
close(pfd[0]);
putenv("upasname", "/dev/null");
snprint(buf, sizeof(buf), "%s/marshal", UPASBIN);
snprint(attachment, sizeof(attachment), "%s", file(name, 'D'));
execl(buf, "send", "-A", attachment, "-s", "permanent failure", sender, nil);
error("can't exec", 0);
break;
default:
break;
}
close(pfd[0]);
fprint(pfd[1], "\n"); /* get out of headers */
if(av[1]){
fprint(pfd[1], "Your request ``%.20s ", av[1]);
for(n = 3; av[n]; n++)
fprint(pfd[1], "%s ", av[n]);
}
fprint(pfd[1], "'' failed (code %s).\nThe symptom was:\n\n", msg);
fd = open(file(name, 'E'), OREAD);
if(fd >= 0){
for(;;){
n = read(fd, buf, sizeof(buf));
if(n <= 0)
break;
if(write(pfd[1], buf, n) != n){
close(fd);
return -1;
}
}
close(fd);
}
close(pfd[1]);
return 0;
}
/*
* print a warning and continue
*/
void
warning(char *f, void *a)
{
char err[ERRMAX];
char buf[256];
rerrstr(err, sizeof(err));
snprint(buf, sizeof(buf), f, a);
fprint(2, "runq: %s: %s\n", buf, err);
}
/*
* print an error and die
*/
void
error(char *f, void *a)
{
char err[ERRMAX];
char buf[256];
rerrstr(err, sizeof(err));
snprint(buf, sizeof(buf), f, a);
fprint(2, "runq: %s: %s\n", buf, err);
exits(buf);
}
void
logit(char *msg, Wdir *w, char *file, char **av)
{
int n, m;
char buf[256];
n = snprint(buf, sizeof(buf), "%s/%s: %s", w->name, file, msg);
for(; *av; av++){
m = strlen(*av);
if(n + m + 4 > sizeof(buf))
break;
sprint(buf + n, " '%s'", *av);
n += m + 3;
}
syslog(0, runqlog, "%s", buf);
}