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Revamp posix_spawn() implementation

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Justine Tunney 2022-10-12 05:26:58 -07:00
parent b41f91c658
commit 0cee831da3
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15 changed files with 383 additions and 215 deletions
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116
libc/stdio/posix_spawn_file_actions.c Normal file
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2021 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ 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 "libc/errno.h"
#include "libc/fmt/fmt.h"
#include "libc/mem/mem.h"
#include "libc/stdio/posix_spawn.h"
#include "libc/stdio/posix_spawn.internal.h"
#include "libc/str/str.h"
static int AddFileAction(posix_spawn_file_actions_t *l,
struct _posix_faction a) {
struct _posix_faction *ap;
if (!(ap = malloc(sizeof(*ap)))) return ENOMEM;
a.next = *l;
*ap = a;
*l = ap;
return 0;
}
/**
* Initializes posix_spawn() file actions list.
*
* @param file_actions will need posix_spawn_file_actions_destroy()
* @return 0 on success, or errno on error
*/
int posix_spawn_file_actions_init(posix_spawn_file_actions_t *file_actions) {
*file_actions = 0;
return 0;
}
/**
* Destroys posix_spawn() file actions list.
*
* This function is safe to call multiple times.
*
* @param file_actions was initialized by posix_spawn_file_actions_init()
* @return 0 on success, or errno on error
*/
int posix_spawn_file_actions_destroy(posix_spawn_file_actions_t *file_actions) {
if (*file_actions) {
posix_spawn_file_actions_destroy(&(*file_actions)->next);
free((*file_actions)->path);
free(*file_actions);
*file_actions = 0;
}
return 0;
}
/**
* Add a close action to object.
*
* @param file_actions was initialized by posix_spawn_file_actions_init()
* @return 0 on success, or errno on error
* @raise ENOMEM if we require more vespene gas
*/
int posix_spawn_file_actions_addclose(posix_spawn_file_actions_t *file_actions,
int fildes) {
return AddFileAction(file_actions, (struct _posix_faction){
.action = _POSIX_SPAWN_CLOSE,
.fildes = fildes,
});
}
/**
* Add a dup2 action to object.
*
* @param file_actions was initialized by posix_spawn_file_actions_init()
* @return 0 on success, or errno on error
* @raise ENOMEM if we require more vespene gas
*/
int posix_spawn_file_actions_adddup2(posix_spawn_file_actions_t *file_actions,
int fildes, int newfildes) {
return AddFileAction(file_actions, (struct _posix_faction){
.action = _POSIX_SPAWN_DUP2,
.fildes = fildes,
.newfildes = newfildes,
});
}
/**
* Add an open action to object.
*
* @param file_actions was initialized by posix_spawn_file_actions_init()
* @param filedes is what open() result gets duplicated to
* @param path will be safely copied
* @return 0 on success, or errno on error
* @raise ENOMEM if we require more vespene gas
*/
int posix_spawn_file_actions_addopen(posix_spawn_file_actions_t *file_actions,
int fildes, const char *path, int oflag,
unsigned mode) {
if (!(path = strdup(path))) return ENOMEM;
return AddFileAction(file_actions, (struct _posix_faction){
.action = _POSIX_SPAWN_OPEN,
.fildes = fildes,
.path = path,
.oflag = oflag,
.mode = mode,
});
}