First commit

Signed-off-by: Mattias Andrée <maandree@kth.se>

1 files changed, 106 insertions, 0 deletions

diff --git a/libexec_pipe_commandsvn.c b/libexec_pipe_commandsvn.c
new file mode 100644
index 0000000..d6aa1d5
--- /dev/null
+++ b/libexec_pipe_commandsvn.c
@@ -0,0 +1,106 @@
+/* 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;
+
+	/* 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