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#include <unistd.h>
#include "buffer.h"
#include "env.h"
#include "exit.h"
#include "fd.h"
#include "getoptb.h"
#include "logmsg.h"
#include "sig.h"
#include "wait.h"
#define WHO "preline"
static void die_usage()
{
logmsg(WHO, 100, USAGE, "preline cmd [ arg ... ]");
}
int flagufline = 1;
char *ufline;
int flagrpline = 1;
char *rpline;
int flagdtline = 1;
char *dtline;
char outbuf[BUFFER_OUTSIZE];
buffer bo = BUFFER_INIT(write, 1, outbuf, sizeof(outbuf));
char inbuf[BUFFER_INSIZE];
buffer bi = BUFFER_INIT(read, 0, inbuf, sizeof(inbuf));
int main(int argc, char **argv)
{
int opt;
int pi[2];
int pid;
int wstat;
sig_pipeignore();
if (!(ufline = env_get("UFLINE"))) die_usage();
if (!(rpline = env_get("RPLINE"))) die_usage();
if (!(dtline = env_get("DTLINE"))) die_usage();
while ((opt = getopt(argc, argv, "frdFRD")) != opteof) {
switch (opt) {
case 'f': flagufline = 0; break;
case 'r': flagrpline = 0; break;
case 'd': flagdtline = 0; break;
case 'F': flagufline = 1; break;
case 'R': flagrpline = 1; break;
case 'D': flagdtline = 1; break;
default: die_usage();
}
}
argc -= optind;
argv += optind;
if (!*argv) die_usage();
if (pipe(pi) == -1) logmsg(WHO, 111, FATAL, "unable to create pipe");
pid = fork();
if (pid == -1) logmsg(WHO, 111, FATAL, "unable to fork");
if (pid == 0) {
close(pi[1]);
if (fd_move(0, pi[0]) == -1) logmsg(WHO, 111, FATAL, "unable to set up fds");
sig_pipedefault();
execvp(*argv, argv);
logmsg(WHO, errno, FATAL, B("unable to run: ", *argv));
}
close(pi[0]);
if (fd_move(1, pi[1]) == -1) logmsg(WHO, 111, FATAL, "unable to set up fds");
if (flagufline) buffer_puts(&bo, ufline);
if (flagrpline) buffer_puts(&bo, rpline);
if (flagdtline) buffer_puts(&bo, dtline);
if (buffer_copy(&bo, &bi) != 0) logmsg(WHO, 111, FATAL, "unable to copy input");
buffer_flush(&bo);
close(1);
if (wait_pid(&wstat, pid) == -1) logmsg(WHO, 111, FATAL, "wait failed");
if (wait_crashed(wstat)) logmsg(WHO, 111, FATAL, "child crashed");
_exit(wait_exitcode(wstat));
}
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