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/* See LICENSE file for copyright and license details. */
#include "common.h"
#ifndef TEST
static void
remove_last_pluming(struct libexec_command *cmd)
{
if (!cmd->nplumings || !cmd->plumings)
abort();
if (cmd->plumings[--cmd->nplumings].type != LIBEXEC_PLUMING_PIPE)
abort();
close(cmd->plumings[cmd->nplumings].target.fd);
if (!cmd->nplumings) {
free(cmd->plumings);
cmd->plumings = NULL;
}
}
static int
pipe_two_commands(enum libexec_pipe how, struct libexec_command *left, struct libexec_command *right)
{
int fds[2], r;
struct libexec_pluming tmp;
if (!left || !right) {
einval:
errno = EINVAL;
return -1;
}
if (how == LIBEXEC_PIPE)
r = pipe(fds);
else if (how == LIBEXEC_SOCK_STREAM)
r = socketpair(PF_UNIX, SOCK_STREAM, 0, fds);
else if (how == LIBEXEC_SOCK_SEQPACKET)
r = socketpair(PF_UNIX, SOCK_SEQPACKET, 0, fds);
else if (how == LIBEXEC_SOCK_DGRAM)
r = socketpair(PF_UNIX, SOCK_DGRAM, 0, fds);
else if (how == LIBEXEC_DIRECT_PIPE)
r = pipe2(fds, O_DIRECT);
else
goto einval;
if (r)
return -1;
if (libexec_dup(left, STDOUT_FILENO, fds[1])) {
close(fds[0]);
close(fds[1]);
return -1;
}
left->plumings[left->nplumings - 1].type = LIBEXEC_PLUMING_PIPE;
if (libexec_dup(right, STDIN_FILENO, fds[0])) {
remove_last_pluming(left);
close(fds[0]);
return -1;
}
right->plumings[right->nplumings - 1].type = LIBEXEC_PLUMING_PIPE;
/* TOOD should `fds[0]` be closed from `left`, and `fds[1]` close from `right`
* (isn't this a problem in general with LIBEXEC_PLUMING_PIPE) */
/* pluming shall be at the front */
tmp = left->plumings[left->nplumings - 1];
memcpy(&left->plumings[1], &left->plumings[0], (left->nplumings - 1) * sizeof(*left->plumings));
left->plumings[0] = tmp;
tmp = right->plumings[right->nplumings - 1];
memcpy(&right->plumings[1], &right->plumings[0], (right->nplumings - 1) * sizeof(*right->plumings));
right->plumings[0] = tmp;
return 0;
}
int
libexec_pipe_commandsvn(enum libexec_pipe how, struct libexec_command *const *cmds, size_t n)
{
enum libexec_pipe circular;
size_t i;
circular = how;
circular &= LIBEXEC_PIPE_CIRCULARLY;
how ^= circular;
for (i = 1; i < n; i++)
if (pipe_two_commands(how, cmds[i - 1], cmds[i]))
goto fail;
if (circular && n)
if (pipe_two_commands(how, cmds[n - 1], cmds[0]))
goto fail;
return 0;
fail:
i -= 1;
while (i) {
remove_last_pluming(cmds[i--]);
remove_last_pluming(cmds[i]);
}
return -1;
}
#else
LIBEXEC_CONST__ int main(void) {return 0;} /* TODO test */
#endif
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