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page: fix filedescriptor leakage

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cinap_lenrek 2011-10-11 08:19:32 +02:00
parent 00f9b5d7f1
commit 79589ef3fb
1 changed files with 46 additions and 65 deletions
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111
sys/src/cmd/page.c
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@ -163,6 +163,32 @@ catchnote(void *, char *msg)
return 0;
}
void
dupfds(int fd, ...)
{
int mfd, n, i;
va_list arg;
Dir *dir;
va_start(arg, fd);
for(mfd = 0; fd >= 0; fd = va_arg(arg, int), mfd++)
if(fd != mfd)
if(dup(fd, mfd) < 0)
sysfatal("dup: %r");
va_end(arg);
if((fd = open("/fd", OREAD)) < 0)
sysfatal("open: %r");
n = dirreadall(fd, &dir);
for(i=0; i<n; i++){
if(strstr(dir[i].name, "ctl"))
continue;
fd = atoi(dir[i].name);
if(fd >= mfd)
close(fd);
}
free(dir);
}
void
pipeline(int fd, char *fmt, ...)
{
@ -181,17 +207,10 @@ pipeline(int fd, char *fmt, ...)
close(pfd[1]);
goto Err;
case 0:
if(dup(fd, 0)<0)
exits("dup");
if(dup(pfd[1], 1)<0)
exits("dup");
close(fd);
close(pfd[1]);
close(pfd[0]);
dupfds(fd, pfd[1], 2, -1);
va_start(arg, fmt);
vsnprint(buf, sizeof buf, fmt, arg);
va_end(arg);
argv[0] = "rc";
argv[1] = "-c";
argv[2] = buf;
@ -267,14 +286,13 @@ popentape(Page *p)
seek(p->fd, 0, 0);
snprint(mnt, sizeof(mnt), "/n/tapefs.%.12d%.8lux", getpid(), (ulong)p);
switch(rfork(RFREND|RFPROC|RFFDG)){
switch(rfork(RFPROC|RFFDG|RFREND)){
case -1:
close(p->fd);
p->fd = -1;
return -1;
case 0:
dup(p->fd, 0);
close(p->fd);
dupfds(p->fd, 1, 2, -1);
argv[0] = "rc";
argv[1] = "-c";
snprint(cmd, sizeof(cmd), "%s -m %s /fd/0", p->data, mnt);
@ -356,29 +374,24 @@ popenpdf(Page *p)
if(pipe(pfd) < 0)
return -1;
switch(rfork(RFFDG|RFPROC|RFMEM|RFNOWAIT)){
switch(rfork(RFPROC|RFFDG|RFMEM|RFNOWAIT)){
case -1:
close(pfd[0]);
close(pfd[1]);
return -1;
case 0:
close(pfd[0]);
gs = p->data;
qlock(gs);
fprint(gs->pin, "%s DoPDFPage\n"
dupfds(gs->pdat, gs->pin, pfd[1], -1);
fprint(1, "%s DoPDFPage\n"
"(/fd/3) (w) file "
"dup flushfile "
"dup (THIS IS NOT AN INFERNO BITMAP\\n) writestring "
"flushfile\n", p->label);
while((n = read(gs->pdat, buf, sizeof buf)) > 0){
while((n = read(0, buf, sizeof buf)) > 0){
if(memcmp(buf, "THIS IS NOT AN INFERNO BITMAP\n", 30) == 0)
break;
if(pfd[1] < 0)
continue;
if(write(pfd[1], buf, n) != n){
close(pfd[1]);
pfd[1]=-1;
}
write(2, buf, n);
}
qunlock(gs);
exits(nil);
@ -436,39 +449,16 @@ popengs(Page *p)
goto Err1;
}
switch(rfork(RFREND|RFPROC|RFFDG|RFNOWAIT)){
switch(rfork(RFPROC|RFFDG|RFREND|RFNOWAIT)){
case -1:
goto Err2;
case 0:
if(pdf){
if(dup(pin[1], 0)<0)
exits("dup");
if(dup(pout[1], 1)<0)
exits("dup");
} else {
if(dup(nullfd, 0)<0)
exits("dup");
if(dup(nullfd, 1)<0)
exits("dup");
}
if(dup(nullfd, 2)<0)
exits("dup");
if(dup(pdat[1], 3)<0)
exits("dup");
if(dup(ifd, 4)<0)
exits("dup");
close(pin[0]);
close(pin[1]);
close(pout[0]);
close(pout[1]);
close(pdat[0]);
close(pdat[1]);
close(ifd);
if(pdf)
dupfds(pin[1], pout[1], nullfd, pdat[1], ifd, -1);
else
dupfds(nullfd, nullfd, nullfd, pdat[1], ifd, -1);
if(p->data)
pipeline(4, "%s", (char*)p->data);
argv[0] = "gs";
argv[1] = "-q";
argv[2] = "-sDEVICE=plan9";
@ -580,15 +570,8 @@ filetype(char *buf, int nbuf, char *typ, int ntyp)
close(ifd[1]);
return -1;
}
if(rfork(RFFDG|RFPROC|RFNOWAIT) == 0){
dup(ifd[1], 0);
dup(ofd[1], 1);
close(ifd[1]);
close(ifd[0]);
close(ofd[1]);
close(ofd[0]);
if(rfork(RFPROC|RFFDG|RFREND|RFNOWAIT) == 0){
dupfds(ifd[1], ofd[1], 2, -1);
argv[0] = "file";
argv[1] = "-m";
argv[2] = 0;
@ -596,9 +579,9 @@ filetype(char *buf, int nbuf, char *typ, int ntyp)
}
close(ifd[1]);
close(ofd[1]);
if(rfork(RFFDG|RFPROC|RFNOWAIT) == 0){
close(ofd[0]);
write(ifd[0], buf, nbuf);
if(rfork(RFPROC|RFFDG|RFNOWAIT) == 0){
dupfds(ifd[0], -1);
write(0, buf, nbuf);
exits(nil);
}
close(ifd[0]);
@ -1129,10 +1112,8 @@ zerox(Page *p)
qlock(p);
if((fd = openpage(p)) < 0)
goto Out;
if(rfork(RFREND|RFFDG|RFPROC|RFENVG|RFNOTEG|RFNOWAIT) == 0){
dup(fd, 0);
close(fd);
if(rfork(RFPROC|RFFDG|RFREND|RFENVG|RFNOTEG|RFNOWAIT) == 0){
dupfds(fd, 1, 2, -1);
snprint(nam, sizeof nam, "/bin/%s", argv0);
argv[0] = argv0;
argv[1] = "-w";