1// Handle AT_FDCWD and absolute paths for the *at functions.
2//
3// In the case of an AT_FDCWD file descriptor or an absolute path, call the
4// corresponding non-`at` function. This will send it through the libpreopen
5// wrappers to convert the path into a directory file descriptor and relative
6// path before translating it into the corresponding `__wasilibc_nocwd_*at`
7// function, which then calls the appropriate WASI function.
8
9#include <fcntl.h>
10#include <stdio.h>
11#include <unistd.h>
12#include <dirent.h>
13#include <sys/types.h>
14#include <sys/stat.h>
15#include <wasi/libc.h>
16#include <wasi/libc-nocwd.h>
17
18// If the platform doesn't define O_TMPFILE, we don't need to worry about it.
19#ifndef O_TMPFILE
20#define O_TMPFILE 0
21#endif
22
23int openat(int dirfd, const char *pathname, int flags, ...) {
24 if (dirfd == AT_FDCWD || pathname[0] == '/') {
25 return open(pathname, flags);
26 }
27
28 return __wasilibc_nocwd_openat_nomode(dirfd, pathname, flags);
29}
30
31int symlinkat(const char *target, int dirfd, const char *linkpath) {
32 if (dirfd == AT_FDCWD || linkpath[0] == '/') {
33 return symlink(target, linkpath);
34 }
35
36 return __wasilibc_nocwd_symlinkat(target, dirfd, linkpath);
37}
38
39ssize_t readlinkat(int dirfd, const char *__restrict pathname, char *__restrict buf, size_t bufsiz) {
40 if (dirfd == AT_FDCWD || pathname[0] == '/') {
41 return readlink(pathname, buf, bufsiz);
42 }
43
44 return __wasilibc_nocwd_readlinkat(dirfd, pathname, buf, bufsiz);
45}
46
47int mkdirat(int dirfd, const char *pathname, mode_t mode) {
48 if (dirfd == AT_FDCWD || pathname[0] == '/') {
49 return mkdir(pathname, mode);
50 }
51
52 return __wasilibc_nocwd_mkdirat_nomode(dirfd, pathname);
53}
54
55DIR *opendirat(int dirfd, const char *path) {
56 if (dirfd == AT_FDCWD || path[0] == '/') {
57 return opendir(path);
58 }
59
60 return __wasilibc_nocwd_opendirat(dirfd, path);
61}
62
63int scandirat(int dirfd, const char *dirp, struct dirent ***namelist,
64 int (*filter)(const struct dirent *),
65 int (*compar)(const struct dirent **, const struct dirent **)) {
66 if (dirfd == AT_FDCWD || dirp[0] == '/') {
67 return scandir(dirp, namelist, filter, compar);
68 }
69
70 return __wasilibc_nocwd_scandirat(dirfd, dirp, namelist, filter, compar);
71}
72
73int faccessat(int dirfd, const char *pathname, int mode, int flags) {
74 if (dirfd == AT_FDCWD || pathname[0] == '/') {
75 return __wasilibc_access(pathname, mode, flags);
76 }
77
78 return __wasilibc_nocwd_faccessat(dirfd, pathname, mode, flags);
79}
80
81int fstatat(int dirfd, const char *__restrict pathname, struct stat *__restrict statbuf, int flags) {
82 if (dirfd == AT_FDCWD || pathname[0] == '/') {
83 return __wasilibc_stat(pathname, statbuf, flags);
84 }
85
86 return __wasilibc_nocwd_fstatat(dirfd, pathname, statbuf, flags);
87}
88
89int utimensat(int dirfd, const char *pathname, const struct timespec times[2], int flags) {
90 if (dirfd == AT_FDCWD || pathname[0] == '/') {
91 return __wasilibc_utimens(pathname, times, flags);
92 }
93
94 return __wasilibc_nocwd_utimensat(dirfd, pathname, times, flags);
95}
96
97int linkat(int olddirfd, const char *oldpath, int newdirfd, const char *newpath, int flags) {
98 if ((olddirfd == AT_FDCWD || oldpath[0] == '/') &&
99 (newdirfd == AT_FDCWD || newpath[0] == '/')) {
100 return __wasilibc_link(oldpath, newpath, flags);
101 }
102 if (olddirfd == AT_FDCWD || oldpath[0] == '/') {
103 return __wasilibc_link_newat(oldpath, newdirfd, newpath, flags);
104 }
105 if (newdirfd == AT_FDCWD || newpath[0] == '/') {
106 return __wasilibc_link_oldat(olddirfd, oldpath, newpath, flags);
107 }
108
109 return __wasilibc_nocwd_linkat(olddirfd, oldpath, newdirfd, newpath, flags);
110}
111
112int renameat(int olddirfd, const char *oldpath, int newdirfd, const char *newpath) {
113 if ((olddirfd == AT_FDCWD || oldpath[0] == '/') &&
114 (newdirfd == AT_FDCWD || newpath[0] == '/')) {
115 return rename(oldpath, newpath);
116 }
117 if (olddirfd == AT_FDCWD || oldpath[0] == '/') {
118 return __wasilibc_rename_newat(oldpath, newdirfd, newpath);
119 }
120 if (newdirfd == AT_FDCWD || newpath[0] == '/') {
121 return __wasilibc_rename_oldat(olddirfd, oldpath, newpath);
122 }
123
124 return __wasilibc_nocwd_renameat(olddirfd, oldpath, newdirfd, newpath);
125}
126
127int __wasilibc_unlinkat(int dirfd, const char *path) {
128 if (dirfd == AT_FDCWD || path[0] == '/') {
129 return unlink(path);
130 }
131
132 return __wasilibc_nocwd___wasilibc_unlinkat(dirfd, path);
133}
134
135int __wasilibc_rmdirat(int dirfd, const char *path) {
136 if (dirfd == AT_FDCWD || path[0] == '/') {
137 return rmdir(path);
138 }
139
140 return __wasilibc_nocwd___wasilibc_rmdirat(dirfd, path);
141}