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#include "sam.h"
#include "parse.h"
extern jmp_buf mainloop;
char errfile[64];
String plan9cmd; /* null terminated */
Buffer plan9buf;
void checkerrs(void);
void
setname(File *f)
{
char buf[1024];
if(f)
snprint(buf, sizeof buf, "%.*S", f->name.n, f->name.s);
else
buf[0] = 0;
putenv("samfile", buf);
putenv("%", buf); // like acme
}
int
plan9(File *f, int type, String *s, int nest)
{
long l;
int m;
int volatile pid;
int fd;
int retcode;
int pipe1[2], pipe2[2];
if(s->s[0]==0 && plan9cmd.s[0]==0)
error(Enocmd);
else if(s->s[0])
Strduplstr(&plan9cmd, s);
if(downloaded){
samerr(errfile);
remove(errfile);
}
if(type!='!' && pipe(pipe1)==-1)
error(Epipe);
if(type=='|')
snarf(f, addr.r.p1, addr.r.p2, &plan9buf, 1);
if((pid=fork()) == 0){
setname(f);
if(downloaded){ /* also put nasty fd's into errfile */
fd = create(errfile, 1, 0666L);
if(fd < 0)
fd = create("/dev/null", 1, 0666L);
dup(fd, 2);
close(fd);
/* 2 now points at err file */
if(type == '>')
dup(2, 1);
else if(type=='!'){
dup(2, 1);
fd = open("/dev/null", 0);
dup(fd, 0);
close(fd);
}
}
if(type != '!') {
if(type=='<' || type=='|')
dup(pipe1[1], 1);
else if(type == '>')
dup(pipe1[0], 0);
close(pipe1[0]);
close(pipe1[1]);
}
if(type == '|'){
if(pipe(pipe2) == -1)
exits("pipe");
if((pid = fork())==0){
/*
* It's ok if we get SIGPIPE here
*/
close(pipe2[0]);
io = pipe2[1];
if(retcode=!setjmp(mainloop)){ /* assignment = */
char *c;
for(l = 0; l<plan9buf.nc; l+=m){
m = plan9buf.nc-l;
if(m>BLOCKSIZE-1)
m = BLOCKSIZE-1;
bufread(&plan9buf, l, genbuf, m);
genbuf[m] = 0;
c = Strtoc(tmprstr(genbuf, m+1));
Write(pipe2[1], c, strlen(c));
free(c);
}
}
exits(retcode? "error" : 0);
}
if(pid==-1){
fprint(2, "Can't fork?!\n");
exits("fork");
}
dup(pipe2[0], 0);
close(pipe2[0]);
close(pipe2[1]);
}
if(type=='<'){
close(0); /* so it won't read from terminal */
open("/dev/null", 0);
}
execl(SHPATH, SH, "-c", Strtoc(&plan9cmd), (char *)0);
exits("exec");
}
if(pid == -1)
error(Efork);
if(type=='<' || type=='|'){
int nulls;
if(downloaded && addr.r.p1 != addr.r.p2)
outTl(Hsnarflen, addr.r.p2-addr.r.p1);
snarf(f, addr.r.p1, addr.r.p2, &snarfbuf, 0);
logdelete(f, addr.r.p1, addr.r.p2);
close(pipe1[1]);
io = pipe1[0];
f->tdot.p1 = -1;
f->ndot.r.p2 = addr.r.p2+readio(f, &nulls, 0, FALSE);
f->ndot.r.p1 = addr.r.p2;
closeio((Posn)-1);
}else if(type=='>'){
close(pipe1[0]);
io = pipe1[1];
bpipeok = 1;
writeio(f);
bpipeok = 0;
closeio((Posn)-1);
}
retcode = waitfor(pid);
if(type=='|' || type=='<')
if(retcode!=0)
warn(Wbadstatus);
if(downloaded)
checkerrs();
if(!nest)
dprint("!\n");
return retcode;
}
void
checkerrs(void)
{
char buf[BLOCKSIZE-10];
int f, n, nl;
char *p;
long l;
if(statfile(errfile, 0, 0, 0, &l, 0) > 0 && l != 0){
if((f=open(errfile, 0)) != -1){
if((n=read(f, buf, sizeof buf-1)) > 0){
for(nl=0,p=buf; nl<25 && p<&buf[n]; p++)
if(*p=='\n')
nl++;
*p = 0;
dprint("%s", buf);
if(p-buf < l-1)
dprint("(sam: more in %s)\n", errfile);
}
close(f);
}
}else
remove(errfile);
}
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