Source / Include Folder (#88)

Moved Source Files Into `src` Folder

1 files changed, 0 insertions, 318 deletions

diff --git a/xspawn.c b/xspawn.c
deleted file mode 100644
index 93c270a..0000000
--- a/xspawn.c
+++ /dev/null
@@ -1,318 +0,0 @@
-/****************************************************************************
- * 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.           *
- ****************************************************************************/
-
-#include "xspawn.h"
-#include "util.h"
-#include <errno.h>
-#include <fcntl.h>
-#include <stdlib.h>
-#include <string.h>
-#include <sys/types.h>
-#include <sys/wait.h>
-#include <unistd.h>
-
-/**
- * Types of spawn actions.
- */
-enum bfs_spawn_op {
-	BFS_SPAWN_CLOSE,
-	BFS_SPAWN_DUP2,
-	BFS_SPAWN_FCHDIR,
-	BFS_SPAWN_SETRLIMIT,
-};
-
-/**
- * A spawn action.
- */
-struct bfs_spawn_action {
-	struct bfs_spawn_action *next;
-
-	enum bfs_spawn_op op;
-	int in_fd;
-	int out_fd;
-	int resource;
-	struct rlimit rlimit;
-};
-
-int bfs_spawn_init(struct bfs_spawn *ctx) {
-	ctx->flags = 0;
-	ctx->actions = NULL;
-	ctx->tail = &ctx->actions;
-	return 0;
-}
-
-int bfs_spawn_destroy(struct bfs_spawn *ctx) {
-	struct bfs_spawn_action *action = ctx->actions;
-	while (action) {
-		struct bfs_spawn_action *next = action->next;
-		free(action);
-		action = next;
-	}
-	return 0;
-}
-
-int bfs_spawn_setflags(struct bfs_spawn *ctx, enum bfs_spawn_flags flags) {
-	ctx->flags = flags;
-	return 0;
-}
-
-/** Add a spawn action to the chain. */
-static struct bfs_spawn_action *bfs_spawn_add(struct bfs_spawn *ctx, enum bfs_spawn_op op) {
-	struct bfs_spawn_action *action = malloc(sizeof(*action));
-	if (action) {
-		action->next = NULL;
-		action->op = op;
-		action->in_fd = -1;
-		action->out_fd = -1;
-
-		*ctx->tail = action;
-		ctx->tail = &action->next;
-	}
-	return action;
-}
-
-int bfs_spawn_addclose(struct bfs_spawn *ctx, int fd) {
-	if (fd < 0) {
-		errno = EBADF;
-		return -1;
-	}
-
-	struct bfs_spawn_action *action = bfs_spawn_add(ctx, BFS_SPAWN_CLOSE);
-	if (action) {
-		action->out_fd = fd;
-		return 0;
-	} else {
-		return -1;
-	}
-}
-
-int bfs_spawn_adddup2(struct bfs_spawn *ctx, int oldfd, int newfd) {
-	if (oldfd < 0 || newfd < 0) {
-		errno = EBADF;
-		return -1;
-	}
-
-	struct bfs_spawn_action *action = bfs_spawn_add(ctx, BFS_SPAWN_DUP2);
-	if (action) {
-		action->in_fd = oldfd;
-		action->out_fd = newfd;
-		return 0;
-	} else {
-		return -1;
-	}
-}
-
-int bfs_spawn_addfchdir(struct bfs_spawn *ctx, int fd) {
-	if (fd < 0) {
-		errno = EBADF;
-		return -1;
-	}
-
-	struct bfs_spawn_action *action = bfs_spawn_add(ctx, BFS_SPAWN_FCHDIR);
-	if (action) {
-		action->in_fd = fd;
-		return 0;
-	} else {
-		return -1;
-	}
-}
-
-int bfs_spawn_addsetrlimit(struct bfs_spawn *ctx, int resource, const struct rlimit *rl) {
-	struct bfs_spawn_action *action = bfs_spawn_add(ctx, BFS_SPAWN_SETRLIMIT);
-	if (action) {
-		action->resource = resource;
-		action->rlimit = *rl;
-		return 0;
-	} else {
-		return -1;
-	}
-}
-
-/** Actually exec() the new process. */
-static void bfs_spawn_exec(const char *exe, const struct bfs_spawn *ctx, char **argv, char **envp, int pipefd[2]) {
-	int error;
-	const struct bfs_spawn_action *actions = ctx ? ctx->actions : NULL;
-
-	xclose(pipefd[0]);
-
-	for (const struct bfs_spawn_action *action = actions; action; action = action->next) {
-		// Move the error-reporting pipe out of the way if necessary...
-		if (action->out_fd == pipefd[1]) {
-			int fd = dup_cloexec(pipefd[1]);
-			if (fd < 0) {
-				goto fail;
-			}
-			xclose(pipefd[1]);
-			pipefd[1] = fd;
-		}
-
-		// ... and pretend the pipe doesn't exist
-		if (action->in_fd == pipefd[1]) {
-			errno = EBADF;
-			goto fail;
-		}
-
-		switch (action->op) {
-		case BFS_SPAWN_CLOSE:
-			if (close(action->out_fd) != 0) {
-				goto fail;
-			}
-			break;
-		case BFS_SPAWN_DUP2:
-			if (dup2(action->in_fd, action->out_fd) < 0) {
-				goto fail;
-			}
-			break;
-		case BFS_SPAWN_FCHDIR:
-			if (fchdir(action->in_fd) != 0) {
-				goto fail;
-			}
-			break;
-		case BFS_SPAWN_SETRLIMIT:
-			if (setrlimit(action->resource, &action->rlimit) != 0) {
-				goto fail;
-			}
-			break;
-		}
-	}
-
-	execve(exe, argv, envp);
-
-fail:
-	error = errno;
-
-	// In case of a write error, the parent will still see that we exited
-	// unsuccessfully, but won't know why
-	(void) xwrite(pipefd[1], &error, sizeof(error));
-
-	xclose(pipefd[1]);
-	_Exit(127);
-}
-
-pid_t bfs_spawn(const char *exe, const struct bfs_spawn *ctx, char **argv, char **envp) {
-	extern char **environ;
-	if (!envp) {
-		envp = environ;
-	}
-
-	enum bfs_spawn_flags flags = ctx ? ctx->flags : 0;
-	char *resolved = NULL;
-	if (flags & BFS_SPAWN_USEPATH) {
-		exe = resolved = bfs_spawn_resolve(exe);
-		if (!resolved) {
-			return -1;
-		}
-	}
-
-	// Use a pipe to report errors from the child
-	int pipefd[2];
-	if (pipe_cloexec(pipefd) != 0) {
-		free(resolved);
-		return -1;
-	}
-
-	pid_t pid = fork();
-	if (pid < 0) {
-		close_quietly(pipefd[1]);
-		close_quietly(pipefd[0]);
-		free(resolved);
-		return -1;
-	} else if (pid == 0) {
-		// Child
-		bfs_spawn_exec(exe, ctx, argv, envp, pipefd);
-	}
-
-	// Parent
-	xclose(pipefd[1]);
-	free(resolved);
-
-	int error;
-	ssize_t nbytes = xread(pipefd[0], &error, sizeof(error));
-	xclose(pipefd[0]);
-	if (nbytes == sizeof(error)) {
-		int wstatus;
-		waitpid(pid, &wstatus, 0);
-		errno = error;
-		return -1;
-	}
-
-	return pid;
-}
-
-char *bfs_spawn_resolve(const char *exe) {
-	if (strchr(exe, '/')) {
-		return strdup(exe);
-	}
-
-	const char *path = getenv("PATH");
-
-	char *confpath = NULL;
-	if (!path) {
-		path = confpath = xconfstr(_CS_PATH);
-		if (!path) {
-			return NULL;
-		}
-	}
-
-	size_t cap = 0;
-	char *ret = NULL;
-	while (true) {
-		const char *end = strchr(path, ':');
-		size_t len = end ? (size_t)(end - path) : strlen(path);
-
-		// POSIX 8.3: "A zero-length prefix is a legacy feature that
-		// indicates the current working directory."
-		if (len == 0) {
-			path = ".";
-			len = 1;
-		}
-
-		size_t total = len + 1 + strlen(exe) + 1;
-		if (cap < total) {
-			char *grown = realloc(ret, total);
-			if (!grown) {
-				goto fail;
-			}
-			ret = grown;
-			cap = total;
-		}
-
-		memcpy(ret, path, len);
-		if (ret[len - 1] != '/') {
-			ret[len++] = '/';
-		}
-		strcpy(ret + len, exe);
-
-		if (xfaccessat(AT_FDCWD, ret, X_OK) == 0) {
-			break;
-		}
-
-		if (!end) {
-			errno = ENOENT;
-			goto fail;
-		}
-
-		path = end + 1;
-	}
-
-	free(confpath);
-	return ret;
-
-fail:
-	free(confpath);
-	free(ret);
-	return NULL;
-}