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/*
* This file is part of the sn package.
* Distribution of sn is covered by the GNU GPL. See file COPYING.
* Copyright 1998-2000 Harold Tay.
* Copyright 2000- Patrik Rdman.
*/
#include <unistd.h>
#include <fcntl.h>
#include <sys/wait.h>
static const char rcsid[] = "$Id$";
int cmdopen (char **command, int *read, int *write)
{
int p0[2] = { -1, -1 };
int p1[2] = { -1, -1 };
int pid = 0;
int er = 0;
int s;
if (read) er = pipe(p0);
if (write) if (0 == er) er = pipe(p1);
if (-1 == er) goto fail;
pid = fork();
if (-1 == pid) goto fail;
if (0 == pid)
{
if (read && write)
{
dup2(p0[0], 0);
dup2(p1[1], 1);
}
else
{
if (read) { close(p0[0]); dup2(p0[1], 1); }
if (write) { close(p1[1]); dup2(p1[0], 0); }
}
execvp(command[0], command);
exit(19);
}
if (!(read && write))
{
if (read) { close(p0[1]); *read = p0[0]; }
if (write) { close(p1[0]); *write = p1[1]; }
}
else
{
*read = p0[0]; *write = p1[1];
}
switch (waitpid(pid, &s, WNOHANG))
{
case 0:
return (pid);
case -1:
pid = -1;
break;
default:
if (WIFEXITED(s))
pid = 0 - WEXITSTATUS(s);
else if (WIFSIGNALED(s))
pid = 0 - (128 + WTERMSIG(s));
}
fail:
if (p0[0] > -1) close(p0[0]);
if (p0[1] > -1) close(p0[1]);
if (p1[0] > -1) close(p1[0]);
if (p1[1] > -1) close(p1[1]);
return (pid);
}
int cmdopensh (char *cmd, int *read, int *write)
{
char *commands[4] = { "sh", "-c", 0, 0 };
commands[2] = cmd;
return (cmdopen(commands, read, write));
}
int cmdwait (int pid)
{
int s;
if (-1 == waitpid(pid, &s, 0))
return (-1);
if (WIFEXITED(s))
return (WEXITSTATUS(s));
else if (WIFSIGNALED(s))
return (128 + WTERMSIG(s));
return (0);
}
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