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listen1: add process limit option

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This commit is contained in:
cinap_lenrek 2011-12-12 10:08:02 +01:00
parent 2524319b4c
commit 733dab56a1
2 changed files with 36 additions and 3 deletions
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2
sys/man/8/listen
View file

@ -18,6 +18,8 @@ listen, listen1, tcp7, tcp9, tcp19, tcp21, tcp22, tcp23, tcp25, tcp53, tcp110, t
[
.B -tv
]
.RB [ -p
.IR maxprocs ]
.I addr
.I cmd
[

37
sys/src/cmd/aux/listen1.c
View file

@ -2,13 +2,14 @@
#include <libc.h>
#include <auth.h>
int maxprocs;
int verbose;
int trusted;
void
usage(void)
{
fprint(2, "usage: listen1 [-tv] address cmd args...\n");
fprint(2, "usage: listen1 [-tv] [-p maxprocs] address cmd args...\n");
exits("usage");
}
@ -51,8 +52,10 @@ remoteaddr(char *dir)
void
main(int argc, char **argv)
{
char data[60], dir[40], ndir[40];
char data[60], dir[40], ndir[40], wbuf[64];
int ctl, nctl, fd;
int wfd, nowait, procs;
Dir *d;
ARGBEGIN{
default:
@ -63,6 +66,9 @@ main(int argc, char **argv)
case 'v':
verbose = 1;
break;
case 'p':
maxprocs = atoi(EARGF(usage()));
break;
}ARGEND
if(argc < 2)
@ -85,12 +91,34 @@ main(int argc, char **argv)
if(ctl < 0)
sysfatal("announce %s: %r", argv[0]);
wfd = -1;
nowait = RFNOWAIT;
if(maxprocs > 0){
snprint(wbuf, sizeof(wbuf), "/proc/%d/wait", getpid());
if((wfd = open(wbuf, OREAD)) >= 0)
nowait = 0;
}
procs = 0;
for(;;){
if(nowait == 0 && (procs >= maxprocs || (procs % 8) == 0))
while(procs > 0){
if(procs < maxprocs){
d = dirfstat(wfd);
if(d == nil || d->length == 0){
free(d);
break;
}
free(d);
}
if(read(wfd, wbuf, sizeof(wbuf)) > 0)
procs--;
}
nctl = listen(dir, ndir);
if(nctl < 0)
sysfatal("listen %s: %r", argv[0]);
switch(rfork(RFFDG|RFPROC|RFNOWAIT|RFENVG|RFNAMEG|RFNOTEG)){
switch(rfork(RFFDG|RFPROC|RFMEM|RFENVG|RFNAMEG|RFNOTEG|nowait)){
case -1:
reject(nctl, ndir, "host overloaded");
close(nctl);
@ -107,6 +135,8 @@ main(int argc, char **argv)
fprint(nctl, "keepalive");
close(ctl);
close(nctl);
if(wfd >= 0)
close(wfd);
putenv("net", ndir);
snprint(data, sizeof data, "%s/data", ndir);
bind(data, "/dev/cons", MREPL);
@ -121,6 +151,7 @@ main(int argc, char **argv)
exits(nil);
default:
close(nctl);
procs++;
break;
}
}