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-rw-r--r--winsup/cygwin/syscalls.cc276
1 files changed, 276 insertions, 0 deletions
diff --git a/winsup/cygwin/syscalls.cc b/winsup/cygwin/syscalls.cc
index 28533a58b..1a2572186 100644
--- a/winsup/cygwin/syscalls.cc
+++ b/winsup/cygwin/syscalls.cc
@@ -61,6 +61,7 @@ details. */
#include "cpuid.h"
#include "registry.h"
#include "environ.h"
+#include "tls_pbuf.h"
#undef _close
#undef _lseek
@@ -3490,3 +3491,278 @@ pclose (FILE *fp)
return status;
}
+
+/* Preliminary(?) implementation of the openat family of functions. */
+
+static int
+gen_full_path_at (char *path_ret, int dirfd, const char *pathname)
+{
+ if (!*pathname)
+ {
+ set_errno (ENOENT);
+ return -1;
+ }
+ if (strlen (pathname) >= PATH_MAX)
+ {
+ set_errno (ENAMETOOLONG);
+ return -1;
+ }
+ if (isdirsep (*pathname))
+ stpcpy (path_ret, pathname);
+ else
+ {
+ char *p;
+
+ if (dirfd == AT_FDCWD)
+ p = stpcpy (path_ret, cygheap->cwd.posix);
+ else
+ {
+ cygheap_fdget cfd (dirfd);
+ if (cfd < 0)
+ return -1;
+ if (!cfd->pc.isdir ())
+ {
+ set_errno (ENOTDIR);
+ return -1;
+ }
+ p = stpcpy (path_ret, cfd->get_name ());
+ }
+ if (!p)
+ {
+ set_errno (ENOTDIR);
+ return -1;
+ }
+ if (p[-1] != '/')
+ *p++ = '/';
+ stpcpy (p, pathname);
+ }
+ return 0;
+}
+
+extern "C" int
+openat (int dirfd, const char *pathname, int flags, ...)
+{
+ myfault efault;
+ if (efault.faulted (EFAULT))
+ return -1;
+ tmp_pathbuf tp;
+ char *path = tp.c_get ();
+ if (gen_full_path_at (path, dirfd, pathname))
+ return -1;
+
+ va_list ap;
+ mode_t mode;
+
+ va_start (ap, flags);
+ mode = va_arg (ap, mode_t);
+ va_end (ap);
+ return open (path, flags, mode);
+}
+
+extern "C" int
+faccessat (int dirfd, const char *pathname, int mode, int flags)
+{
+ myfault efault;
+ if (efault.faulted (EFAULT))
+ return -1;
+
+ int res = -1;
+ tmp_pathbuf tp;
+ char *path = tp.c_get ();
+ if (!gen_full_path_at (path, dirfd, pathname))
+ {
+ if (flags & ~(F_OK|R_OK|W_OK|X_OK))
+ set_errno (EINVAL);
+ else
+ {
+ fhandler_base *fh = build_fh_name (path, NULL,
+ (flags & AT_SYMLINK_NOFOLLOW)
+ ? PC_SYM_NOFOLLOW : PC_SYM_FOLLOW,
+ stat_suffixes);
+ if (fh)
+ {
+ res = fh->fhaccess (mode);
+ delete fh;
+ }
+ }
+ }
+ debug_printf ("returning %d", res);
+ return res;
+}
+
+extern "C" int
+fchmodat (int dirfd, const char *pathname, mode_t mode, int flags)
+{
+ myfault efault;
+ if (efault.faulted (EFAULT))
+ return -1;
+ tmp_pathbuf tp;
+ char *path = tp.c_get ();
+ if (gen_full_path_at (path, dirfd, pathname))
+ return -1;
+ return chmod (path, mode);
+}
+
+extern "C" int
+fchownat (int dirfd, const char *pathname, __uid32_t uid, __gid32_t gid,
+ int flags)
+{
+ myfault efault;
+ if (efault.faulted (EFAULT))
+ return -1;
+ tmp_pathbuf tp;
+ char *path = tp.c_get ();
+ if (gen_full_path_at (path, dirfd, pathname))
+ return -1;
+ return chown_worker (path, (flags & AT_SYMLINK_NOFOLLOW)
+ ? PC_SYM_NOFOLLOW : PC_SYM_FOLLOW, uid, gid);
+}
+
+extern "C" int
+fstatat (int dirfd, const char *pathname, struct __stat64 *st, int flags)
+{
+ myfault efault;
+ if (efault.faulted (EFAULT))
+ return -1;
+ tmp_pathbuf tp;
+ char *path = tp.c_get ();
+ if (gen_full_path_at (path, dirfd, pathname))
+ return -1;
+ return (flags & AT_SYMLINK_NOFOLLOW) ? lstat64 (path, st) : stat64 (path, st);
+}
+
+extern "C" int
+futimesat (int dirfd, const char *pathname, const struct timeval *times)
+{
+ myfault efault;
+ if (efault.faulted (EFAULT))
+ return -1;
+ tmp_pathbuf tp;
+ char *path = tp.c_get ();
+ if (gen_full_path_at (path, dirfd, pathname))
+ return -1;
+ return utimes (path, times);
+}
+
+extern "C" int
+linkat (int olddirfd, const char *oldpathname,
+ int newdirfd, const char *newpathname,
+ int flags)
+{
+ myfault efault;
+ if (efault.faulted (EFAULT))
+ return -1;
+ tmp_pathbuf tp;
+ char *oldpath = tp.c_get ();
+ if (gen_full_path_at (oldpath, olddirfd, oldpathname))
+ return -1;
+ char *newpath = tp.c_get ();
+ if (gen_full_path_at (newpath, newdirfd, newpathname))
+ return -1;
+ if (flags & AT_SYMLINK_FOLLOW)
+ {
+ path_conv old_name (oldpath, PC_SYM_FOLLOW | PC_POSIX, stat_suffixes);
+ if (old_name.error)
+ {
+ set_errno (old_name.error);
+ return -1;
+ }
+ strcpy (oldpath, old_name.normalized_path);
+ }
+ return link (oldpath, newpath);
+}
+
+extern "C" int
+mkdirat (int dirfd, const char *pathname, mode_t mode)
+{
+ myfault efault;
+ if (efault.faulted (EFAULT))
+ return -1;
+ tmp_pathbuf tp;
+ char *path = tp.c_get ();
+ if (gen_full_path_at (path, dirfd, pathname))
+ return -1;
+ return mkdir (path, mode);
+}
+
+extern "C" int
+mkfifoat (int dirfd, const char *pathname, mode_t mode)
+{
+ myfault efault;
+ if (efault.faulted (EFAULT))
+ return -1;
+ tmp_pathbuf tp;
+ char *path = tp.c_get ();
+ if (gen_full_path_at (path, dirfd, pathname))
+ return -1;
+ return mkfifo (path, mode);
+}
+
+extern "C" int
+mknodat (int dirfd, const char *pathname, mode_t mode, __dev32_t dev)
+{
+ myfault efault;
+ if (efault.faulted (EFAULT))
+ return -1;
+ tmp_pathbuf tp;
+ char *path = tp.c_get ();
+ if (gen_full_path_at (path, dirfd, pathname))
+ return -1;
+ return mknod32 (path, mode, dev);
+}
+
+extern "C" ssize_t
+readlinkat (int dirfd, const char *pathname, char *buf, size_t bufsize)
+{
+ myfault efault;
+ if (efault.faulted (EFAULT))
+ return -1;
+ tmp_pathbuf tp;
+ char *path = tp.c_get ();
+ if (gen_full_path_at (path, dirfd, pathname))
+ return -1;
+ return readlink (path, buf, bufsize);
+}
+
+extern "C" int
+renameat (int olddirfd, const char *oldpathname,
+ int newdirfd, const char *newpathname)
+{
+ myfault efault;
+ if (efault.faulted (EFAULT))
+ return -1;
+ tmp_pathbuf tp;
+ char *oldpath = tp.c_get ();
+ if (gen_full_path_at (oldpath, olddirfd, oldpathname))
+ return -1;
+ char *newpath = tp.c_get ();
+ if (gen_full_path_at (newpath, newdirfd, newpathname))
+ return -1;
+ return rename (oldpath, newpath);
+}
+
+extern "C" int
+symlinkat (const char *oldpath, int newdirfd, const char *newpathname)
+{
+ myfault efault;
+ if (efault.faulted (EFAULT))
+ return -1;
+ tmp_pathbuf tp;
+ char *newpath = tp.c_get ();
+ if (gen_full_path_at (newpath, newdirfd, newpathname))
+ return -1;
+ return symlink (oldpath, newpath);
+}
+
+extern "C" int
+unlinkat (int dirfd, const char *pathname, int flags)
+{
+ myfault efault;
+ if (efault.faulted (EFAULT))
+ return -1;
+ tmp_pathbuf tp;
+ char *path = tp.c_get ();
+ if (gen_full_path_at (path, dirfd, pathname))
+ return -1;
+ return (flags & AT_REMOVEDIR) ? rmdir (path) : unlink (path);
+}
generated by cgit v1.2.3 (git 2.25.1) at 2025-04-30 11:07:40 +0000