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Kernel+LibC: Add fstatat
The function fstatat can do the same thing as the stat and lstat functions. However, it can be passed the file descriptor of a directory which will be used when as the starting point for relative paths. This is contrary to stat and lstat which use the current working directory as the starting for relative paths.
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6 changed files with 29 additions and 5 deletions
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@ -40,6 +40,7 @@ __BEGIN_DECLS
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int creat(const char* path, mode_t);
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int open(const char* path, int options, ...);
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#define AT_FDCWD -100
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#define AT_SYMLINK_NOFOLLOW 0x100
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int openat(int dirfd, const char* path, int options, ...);
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int fcntl(int fd, int cmd, ...);
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@ -6,6 +6,7 @@
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#include <assert.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/stat.h>
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@ -50,25 +51,25 @@ int mkfifo(const char* pathname, mode_t mode)
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return mknod(pathname, mode | S_IFIFO, 0);
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}
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static int do_stat(const char* path, struct stat* statbuf, bool follow_symlinks)
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static int do_stat(int dirfd, const char* path, struct stat* statbuf, bool follow_symlinks)
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{
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if (!path) {
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errno = EFAULT;
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return -1;
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}
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Syscall::SC_stat_params params { { path, strlen(path) }, statbuf, follow_symlinks };
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Syscall::SC_stat_params params { dirfd, { path, strlen(path) }, statbuf, follow_symlinks };
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int rc = syscall(SC_stat, ¶ms);
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__RETURN_WITH_ERRNO(rc, rc, -1);
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}
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int lstat(const char* path, struct stat* statbuf)
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{
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return do_stat(path, statbuf, false);
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return do_stat(AT_FDCWD, path, statbuf, false);
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}
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int stat(const char* path, struct stat* statbuf)
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{
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return do_stat(path, statbuf, true);
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return do_stat(AT_FDCWD, path, statbuf, true);
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}
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int fstat(int fd, struct stat* statbuf)
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@ -76,4 +77,9 @@ int fstat(int fd, struct stat* statbuf)
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int rc = syscall(SC_fstat, fd, statbuf);
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__RETURN_WITH_ERRNO(rc, rc, -1);
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}
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int fstatat(int fd, const char* path, struct stat* statbuf, int flags)
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{
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return do_stat(fd, path, statbuf, !(flags & AT_SYMLINK_NOFOLLOW));
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}
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}
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@ -77,5 +77,6 @@ int mkfifo(const char* pathname, mode_t);
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int fstat(int fd, struct stat* statbuf);
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int lstat(const char* path, struct stat* statbuf);
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int stat(const char* path, struct stat* statbuf);
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int fstatat(int fd, const char* path, struct stat* statbuf, int flags);
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__END_DECLS
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