Add compat wrapper for fstatat

Compat.c

@@ -0,0 +1,46 @@
+/*
+htop - Compat.c
+(C) 2020 Christian Göttsche
+Released under the GNU GPLv2, see the COPYING file
+in the source distribution for its full text.
+*/
+
+#include "config.h" // IWYU pragma: keep
+
+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+
+#include "Compat.h"
+#ifndef HAVE_FSTATAT
+#include "XUtils.h"
+#endif
+
+
+int Compat_fstatat(int dirfd,
+                   const char* dirpath,
+                   const char* pathname,
+                   struct stat* statbuf,
+                   int flags) {
+
+#ifdef HAVE_FSTATAT
+
+   (void)dirpath;
+
+   return fstatat(dirfd, pathname, statbuf, flags);
+
+#else
+
+   (void)dirfd;
+
+   char path[4096];
+   xSnprintf(path, sizeof(path), "%s/%s", dirpath, pathname);
+
+   if (flags & AT_SYMLINK_NOFOLLOW)
+      return lstat(path, statbuf);
+
+   return stat(path, statbuf);
+
+#endif
+}

Compat.h

@@ -0,0 +1,19 @@
+#ifndef HEADER_Compat
+#define HEADER_Compat
+/*
+htop - Compat.h
+(C) 2020 Christian Göttsche
+Released under the GNU GPLv2, see the COPYING file
+in the source distribution for its full text.
+*/
+
+#include <sys/stat.h>
+
+
+int Compat_fstatat(int dirfd,
+                   const char* dirpath,
+                   const char* pathname,
+                   struct stat* statbuf,
+                   int flags);
+
+#endif /* HEADER_Compat */

Makefile.am

@@ -26,6 +26,7 @@ myhtopsources = \
 	ColorsPanel.c \
 	ColumnsPanel.c \
 	CommandScreen.c \
+	Compat.c \
 	CPUMeter.c \
 	CRT.c \
 	DateMeter.c \
@@ -79,6 +80,7 @@ myhtopheaders = \
 	ColorsPanel.h \
 	ColumnsPanel.h \
 	CommandScreen.h \
+	Compat.h \
 	DateMeter.h \
 	DateTimeMeter.h \
 	DiskIOMeter.h \

configure.ac

@@ -88,7 +88,7 @@ AC_TYPE_UID_T
 # ----------------------------------------------------------------------
 AC_FUNC_CLOSEDIR_VOID
 AC_FUNC_STAT
-AC_CHECK_FUNCS([memmove strncasecmp strstr strdup])
+AC_CHECK_FUNCS([fstatat memmove strncasecmp strstr strdup])
 
 save_cflags="${CFLAGS}"
 CFLAGS="${CFLAGS} -std=c99"

freebsd/FreeBSDProcessList.c

@@ -22,6 +22,7 @@ in the source distribution for its full text.
 #include <sys/types.h>
 #include <sys/user.h>
 
+#include "Compat.h"
 #include "CRT.h"
 #include "FreeBSDProcess.h"
 #include "Macros.h"
@@ -338,7 +339,7 @@ static void FreeBSDProcessList_scanTTYs(ProcessList* pl) {
             continue;
 
          struct stat info;
-         if (fstatat(dirFd, entry->d_name, &info, 0) < 0)
+         if (Compat_fstatat(dirFd, "/dev", entry->d_name, &info, 0) < 0)
             continue;
 
          if (!S_ISCHR(info.st_mode))
@@ -365,7 +366,7 @@ err1:
       const struct dirent* entry;
       while ((entry = readdir(dirPtr))) {
          struct stat info;
-         if (fstatat(dirFd, entry->d_name, &info, 0) < 0)
+         if (Compat_fstatat(dirFd, "/dev/pts", entry->d_name, &info, 0) < 0)
             continue;
 
          if (!S_ISCHR(info.st_mode))