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Improve system call documentation

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This change also introduces partial faccessat() support for zipos and
makes some slight breaking changes in errno results. close() is fixed
to use `EBADF` rather than `EINVAL` and we're now using `ENOTSUP` not
`EOPNOTSUPP` to indicate that zipos doesn't support a system call yet
This commit is contained in:
Justine Tunney 2022-10-02 07:42:44 -07:00
parent 0b5f84dd20
commit ad97775370
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18 changed files with 273 additions and 67 deletions
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67
libc/zipos/access.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 2022 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/calls/calls.h"
#include "libc/calls/struct/stat.h"
#include "libc/sysv/consts/ok.h"
#include "libc/sysv/errfuns.h"
#include "libc/zip.h"
#include "libc/zipos/zipos.internal.h"
// TODO: this should check parent directory components
/**
* Checks access metadata in αcτµαlly pδrταblε εxεcµταblε object store.
*
* @param uri is obtained via __zipos_parseuri()
* @asyncsignalsafe
*/
int __zipos_access(const struct ZiposUri *name, int amode) {
ssize_t cf;
int rc, mode;
struct Zipos *z;
if ((z = __zipos_get()) && (cf = __zipos_find(z, name)) != -1) {
mode = GetZipCfileMode(z->map + cf);
if (amode == F_OK) {
rc = 0;
} else if (amode == R_OK) {
if (mode & 0444) {
rc = 0;
} else {
rc = eacces();
}
} else if (amode == W_OK) {
if (mode & 0222) {
rc = 0;
} else {
rc = eacces();
}
} else if (amode == X_OK) {
if (mode & 0111) {
rc = 0;
} else {
rc = eacces();
}
} else {
rc = einval();
}
} else {
rc = enoent();
}
return rc;
}