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-rw-r--r--src/xspawn.c62
1 files changed, 59 insertions, 3 deletions
diff --git a/src/xspawn.c b/src/xspawn.c
index 6a94d3d..e739c5f 100644
--- a/src/xspawn.c
+++ b/src/xspawn.c
@@ -26,6 +26,7 @@
* Types of spawn actions.
*/
enum bfs_spawn_op {
+ BFS_SPAWN_OPEN,
BFS_SPAWN_CLOSE,
BFS_SPAWN_DUP2,
BFS_SPAWN_FCHDIR,
@@ -36,13 +37,31 @@ enum bfs_spawn_op {
* A spawn action.
*/
struct bfs_spawn_action {
+ /** The next action in the list. */
struct bfs_spawn_action *next;
+ /** This action's operation. */
enum bfs_spawn_op op;
+ /** The input fd (or -1). */
int in_fd;
+ /** The output fd (or -1). */
int out_fd;
- int resource;
- struct rlimit rlimit;
+
+ /** Operation-specific args. */
+ union {
+ /** BFS_SPAWN_OPEN args. */
+ struct {
+ const char *path;
+ int flags;
+ mode_t mode;
+ };
+
+ /** BFS_SPAWN_SETRLIMIT args. */
+ struct {
+ int resource;
+ struct rlimit rlimit;
+ };
+ };
};
int bfs_spawn_init(struct bfs_spawn *ctx) {
@@ -116,6 +135,30 @@ static struct bfs_spawn_action *bfs_spawn_action(enum bfs_spawn_op op) {
return action;
}
+int bfs_spawn_addopen(struct bfs_spawn *ctx, int fd, const char *path, int flags, mode_t mode) {
+ struct bfs_spawn_action *action = bfs_spawn_action(BFS_SPAWN_OPEN);
+ if (!action) {
+ return -1;
+ }
+
+#if _POSIX_SPAWN > 0
+ if (ctx->flags & BFS_SPAWN_USE_POSIX) {
+ errno = posix_spawn_file_actions_addopen(&ctx->actions, fd, path, flags, mode);
+ if (errno != 0) {
+ free(action);
+ return -1;
+ }
+ }
+#endif
+
+ action->out_fd = fd;
+ action->path = path;
+ action->flags = flags;
+ action->mode = mode;
+ SLIST_APPEND(ctx, action);
+ return 0;
+}
+
int bfs_spawn_addclose(struct bfs_spawn *ctx, int fd) {
struct bfs_spawn_action *action = bfs_spawn_action(BFS_SPAWN_CLOSE);
if (!action) {
@@ -249,9 +292,11 @@ static noreturn void bfs_spawn_exec(const char *exe, const struct bfs_spawn *ctx
xclose(pipefd[0]);
for_slist (const struct bfs_spawn_action, action, ctx) {
+ int fd;
+
// Move the error-reporting pipe out of the way if necessary...
if (action->out_fd == pipefd[1]) {
- int fd = dup_cloexec(pipefd[1]);
+ fd = dup_cloexec(pipefd[1]);
if (fd < 0) {
goto fail;
}
@@ -266,6 +311,17 @@ static noreturn void bfs_spawn_exec(const char *exe, const struct bfs_spawn *ctx
}
switch (action->op) {
+ case BFS_SPAWN_OPEN:
+ fd = open(action->path, action->flags, action->mode);
+ if (fd < 0) {
+ goto fail;
+ }
+ if (fd != action->out_fd) {
+ if (dup2(fd, action->out_fd) < 0) {
+ goto fail;
+ }
+ }
+ break;
case BFS_SPAWN_CLOSE:
if (close(action->out_fd) != 0) {
goto fail;