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Make posix_spawn faster on Windows

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This commit is contained in:
Justine Tunney 2023-08-20 02:13:02 -07:00
parent d6f72aa4a6
commit ec957491ea
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GPG key ID: BE714B4575D6E328
15 changed files with 514 additions and 123 deletions
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17
libc/stdio/posix_spawn_file_actions.c
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@ -16,6 +16,7 @@
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/dce.h"
#include "libc/errno.h"
#include "libc/fmt/fmt.h"
#include "libc/mem/mem.h"
@ -27,8 +28,8 @@ 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;
while (*l) l = &(*l)->next;
*l = ap;
return 0;
}
@ -36,6 +37,8 @@ static int AddFileAction(posix_spawn_file_actions_t *l,
/**
* Initializes posix_spawn() file actions list.
*
* File actions get applied in the same order as they're registered.
*
* @param file_actions will need posix_spawn_file_actions_destroy()
* @return 0 on success, or errno on error
*/
@ -68,9 +71,12 @@ int posix_spawn_file_actions_destroy(posix_spawn_file_actions_t *file_actions) {
* @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
* @raise EBADF if `fildes` is negative
*/
int posix_spawn_file_actions_addclose(posix_spawn_file_actions_t *file_actions,
int fildes) {
if (fildes < 0) return EBADF;
if (IsWindows() && fildes > 2) return 0;
return AddFileAction(file_actions, (struct _posix_faction){
.action = _POSIX_SPAWN_CLOSE,
.fildes = fildes,
@ -83,9 +89,13 @@ int posix_spawn_file_actions_addclose(posix_spawn_file_actions_t *file_actions,
* @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
* @raise EBADF if 'fildes' or `newfildes` is negative
* @raise ENOTSUP if `newfildes` isn't 0, 1, or 2 on Windows
*/
int posix_spawn_file_actions_adddup2(posix_spawn_file_actions_t *file_actions,
int fildes, int newfildes) {
if (fildes < 0 || newfildes < 0) return EBADF;
if (IsWindows() && newfildes > 2) return ENOTSUP;
return AddFileAction(file_actions, (struct _posix_faction){
.action = _POSIX_SPAWN_DUP2,
.fildes = fildes,
@ -97,15 +107,18 @@ int posix_spawn_file_actions_adddup2(posix_spawn_file_actions_t *file_actions,
* 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 fildes 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
* @raise EBADF if `fildes` is negative
* @raise ENOTSUP if `fildes` isn't 0, 1, or 2 on Windows
*/
int posix_spawn_file_actions_addopen(posix_spawn_file_actions_t *file_actions,
int fildes, const char *path, int oflag,
unsigned mode) {
if (fildes < 0) return EBADF;
if (IsWindows() && fildes > 2) return ENOTSUP;
if (!(path = strdup(path))) return ENOMEM;
return AddFileAction(file_actions, (struct _posix_faction){
.action = _POSIX_SPAWN_OPEN,