1 files changed, 123 insertions, 0 deletions
diff --git a/src/xspawn.h b/src/xspawn.h
new file mode 100644
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+++ b/src/xspawn.h
@@ -0,0 +1,123 @@
+/****************************************************************************
+ * bfs                                                                      *
+ * Copyright (C) 2018-2022 Tavian Barnes <tavianator@tavianator.com>        *
+ *                                                                          *
+ * Permission to use, copy, modify, and/or distribute this software for any *
+ * purpose with or without fee is hereby granted.                           *
+ *                                                                          *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES *
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF         *
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR  *
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES   *
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN    *
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF  *
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.           *
+ ****************************************************************************/
+
+/**
+ * A process-spawning library inspired by posix_spawn().
+ */
+
+#ifndef BFS_XSPAWN_H
+#define BFS_XSPAWN_H
+
+#include <sys/resource.h>
+#include <sys/types.h>
+
+/**
+ * bfs_spawn() flags.
+ */
+enum bfs_spawn_flags {
+	/** Use the PATH variable to resolve the executable (like execvp()). */
+	BFS_SPAWN_USEPATH = 1 << 0,
+};
+
+/**
+ * bfs_spawn() attributes, controlling the context of the new process.
+ */
+struct bfs_spawn {
+	enum bfs_spawn_flags flags;
+	struct bfs_spawn_action *actions;
+	struct bfs_spawn_action **tail;
+};
+
+/**
+ * Create a new bfs_spawn() context.
+ *
+ * @return 0 on success, -1 on failure.
+ */
+int bfs_spawn_init(struct bfs_spawn *ctx);
+
+/**
+ * Destroy a bfs_spawn() context.
+ *
+ * @return 0 on success, -1 on failure.
+ */
+int bfs_spawn_destroy(struct bfs_spawn *ctx);
+
+/**
+ * Set the flags for a bfs_spawn() context.
+ *
+ * @return 0 on success, -1 on failure.
+ */
+int bfs_spawn_setflags(struct bfs_spawn *ctx, enum bfs_spawn_flags flags);
+
+/**
+ * Add a close() action to a bfs_spawn() context.
+ *
+ * @return 0 on success, -1 on failure.
+ */
+int bfs_spawn_addclose(struct bfs_spawn *ctx, int fd);
+
+/**
+ * Add a dup2() action to a bfs_spawn() context.
+ *
+ * @return 0 on success, -1 on failure.
+ */
+int bfs_spawn_adddup2(struct bfs_spawn *ctx, int oldfd, int newfd);
+
+/**
+ * Add an fchdir() action to a bfs_spawn() context.
+ *
+ * @return 0 on success, -1 on failure.
+ */
+int bfs_spawn_addfchdir(struct bfs_spawn *ctx, int fd);
+
+/**
+ * Add a setrlimit() action to a bfs_spawn() context.
+ *
+ * @return 0 on success, -1 on failure.
+ */
+int bfs_spawn_addsetrlimit(struct bfs_spawn *ctx, int resource, const struct rlimit *rl);
+
+/**
+ * Spawn a new process.
+ *
+ * @param exe
+ *         The executable to run.
+ * @param ctx
+ *         The context for the new process.
+ * @param argv
+ *         The arguments for the new process.
+ * @param envp
+ *         The environment variables for the new process (NULL for the current
+ *         environment).
+ * @return
+ *         The PID of the new process, or -1 on error.
+ */
+pid_t bfs_spawn(const char *exe, const struct bfs_spawn *ctx, char **argv, char **envp);
+
+/**
+ * Look up an executable in the current PATH, as BFS_SPAWN_USEPATH or execvp()
+ * would do.
+ *
+ * @param exe
+ *         The name of the binary to execute.  Bare names without a '/' will be
+ *         searched on the provided PATH.
+ * @return
+ *         The full path to the executable, which should be free()'d, or NULL on
+ *         failure.
+ */
+char *bfs_spawn_resolve(const char *exe);
+
+#endif // BFS_XSPAWN_H