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#include "sig.h"
#include "buffer.h"
#include "strerr.h"
#include "str.h"
#include "byte.h"
#include "readwrite.h"
#include "exit.h"
#include "fmt.h"
#include "iopause.h"
#include "pathexec.h"
#define FATAL "recordio: fatal: "
char pid[FMT_ULONG];
char recordbuf[512];
buffer ssrecord = BUFFER_INIT(write,2,recordbuf,sizeof recordbuf);
void record(char *buf,int len,char *direction) /* 1 <= len <= 256 */
{
int i;
while (len) {
buffer_puts(&ssrecord,pid);
buffer_puts(&ssrecord,direction);
i = byte_chr(buf,len,'\n');
buffer_put(&ssrecord,buf,i);
if (i == len) {
buffer_puts(&ssrecord,"+\n");
buffer_flush(&ssrecord);
return;
}
buffer_puts(&ssrecord," \n");
buffer_flush(&ssrecord);
buf += i + 1;
len -= i + 1;
}
}
int leftstatus = 0;
char leftbuf[256];
int leftlen;
int leftpos;
int rightstatus = 0;
char rightbuf[256];
int rightlen;
int rightpos;
void doit(int fdleft,int fdright) /* copy 0 -> fdleft, copy fdright -> 1 */
{
struct taia stamp;
struct taia deadline;
iopause_fd x[4];
int xlen;
iopause_fd *io0;
iopause_fd *ioleft;
iopause_fd *io1;
iopause_fd *ioright;
int r;
for (;;) {
xlen = 0;
io0 = 0;
if (leftstatus == 0) {
io0 = &x[xlen++];
io0->fd = 0;
io0->events = IOPAUSE_READ;
}
ioleft = 0;
if (leftstatus == 1) {
ioleft = &x[xlen++];
ioleft->fd = fdleft;
ioleft->events = IOPAUSE_WRITE;
}
ioright = 0;
if (rightstatus == 0) {
ioright = &x[xlen++];
ioright->fd = fdright;
ioright->events = IOPAUSE_READ;
}
io1 = 0;
if (rightstatus == 1) {
io1 = &x[xlen++];
io1->fd = 1;
io1->events = IOPAUSE_WRITE;
}
taia_now(&stamp);
taia_uint(&deadline,3600);
taia_add(&deadline,&stamp,&deadline);
iopause(x,xlen,&deadline,&stamp);
if (io0 && io0->revents) {
r = read(0,leftbuf,sizeof leftbuf);
if (r <= 0) {
leftstatus = -1;
close(fdleft);
buffer_puts(&ssrecord,pid);
buffer_puts(&ssrecord," < [EOF]\n");
buffer_flush(&ssrecord);
}
else {
leftstatus = 1; leftpos = 0; leftlen = r;
record(leftbuf,r," < ");
}
}
if (ioleft && ioleft->revents) {
r = write(fdleft,leftbuf + leftpos,leftlen - leftpos);
if (r == -1) break;
leftpos += r;
if (leftpos == leftlen) leftstatus = 0;
}
if (ioright && ioright->revents) {
r = read(fdright,rightbuf,sizeof rightbuf);
if (r <= 0) {
buffer_puts(&ssrecord,pid);
buffer_puts(&ssrecord," > [EOF]\n");
buffer_flush(&ssrecord);
break;
}
rightstatus = 1; rightpos = 0; rightlen = r;
record(rightbuf,r," > ");
}
if (io1 && io1->revents) {
r = write(1,rightbuf + rightpos,rightlen - rightpos);
if (r == -1) break;
rightpos += r;
if (rightpos == rightlen) rightstatus = 0;
}
}
_exit(0);
}
main(int argc,char **argv,char **envp)
{
int piin[2];
int piout[2];
pid[fmt_ulong(pid,getpid())] = 0;
if (argc < 2)
strerr_die1x(100,"recordio: usage: recordio program [ arg ... ]");
if (pipe(piin) == -1)
strerr_die2sys(111,FATAL,"unable to create pipe: ");
if (pipe(piout) == -1)
strerr_die2sys(111,FATAL,"unable to create pipe: ");
switch(fork()) {
case -1:
strerr_die2sys(111,FATAL,"unable to fork: ");
case 0:
sig_ignore(sig_pipe);
close(piin[0]);
close(piout[1]);
doit(piin[1],piout[0]);
}
close(piin[1]);
close(piout[0]);
if (fd_move(0,piin[0]) == -1)
strerr_die2sys(111,FATAL,"unable to move descriptors: ");
if (fd_move(1,piout[1]) == -1)
strerr_die2sys(111,FATAL,"unable to move descriptors: ");
pathexec_run(argv[1],argv + 1,envp);
strerr_die4sys(111,FATAL,"unable to run ",argv[1],": ");
}
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