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/****************************************************************************
* bfs *
* Copyright (C) 2018-2019 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_SPAWN_H
#define BFS_SPAWN_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_SPAWN_H
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