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Add posix_spawn (#114)

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Justine Tunney 2021-03-07 20:14:07 -08:00
parent 5f088cec23
commit 5ce83b08c8
10 changed files with 521 additions and 22 deletions
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85
libc/stdio/spawnf.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/spawn.h"
#include "libc/str/str.h"
/**
* Creates object with no actions.
*/
int posix_spawn_file_actions_init(posix_spawn_file_actions_t *file_actions) {
*file_actions = malloc(sizeof(char));
if (!*file_actions) return ENOMEM;
strcpy(*file_actions, "");
return 0;
}
/**
* Frees object storage and make invalid.
*/
int posix_spawn_file_actions_destroy(posix_spawn_file_actions_t *file_actions) {
free(*file_actions);
*file_actions = NULL;
return 0;
}
/**
* Adds new action string to object.
*/
static int add_to_file_actions(posix_spawn_file_actions_t *file_actions,
char *new_action) {
*file_actions =
realloc(*file_actions, strlen(*file_actions) + strlen(new_action) + 1);
if (!*file_actions) return ENOMEM;
strcat(*file_actions, new_action);
return 0;
}
/**
* Add a close action to object.
*/
int posix_spawn_file_actions_addclose(posix_spawn_file_actions_t *file_actions,
int fildes) {
char temp[100];
sprintf(temp, "close(%d)", fildes);
return add_to_file_actions(file_actions, temp);
}
/**
* Add a dup2 action to object.
*/
int posix_spawn_file_actions_adddup2(posix_spawn_file_actions_t *file_actions,
int fildes, int newfildes) {
char temp[100];
sprintf(temp, "dup2(%d,%d)", fildes, newfildes);
return add_to_file_actions(file_actions, temp);
}
/**
* Add an open action to object.
*/
int posix_spawn_file_actions_addopen(posix_spawn_file_actions_t *file_actions,
int fildes, const char *path, int oflag,
unsigned mode) {
char temp[100];
sprintf(temp, "open(%d,%s*%o,%o)", fildes, path, oflag, mode);
return add_to_file_actions(file_actions, temp);
}