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npe: add fstat

--- a/include/npe/unistd.h

+++ b/include/npe/unistd.h

@@ -41,6 +41,7 @@

 #define getcwd getwd

 #define stat npe_stat

+#define fstat npe_fstat

 struct stat {

 	uvlong st_size;

@@ -49,6 +50,7 @@

 };

 int npe_stat(char *filename, struct stat *buf);

+int npe_fstat(int fd, struct stat *buf);

 int fstatat(int dirfd, char *path, struct stat *buf, int flags);

 int unlink(char *path);

 int access(char *name, int mode);

--- /dev/null

+++ b/libnpe/fstat.c

@@ -1,0 +1,27 @@

+#include <unistd.h>

+#include <errno.h>

+

+#undef fstat

+

+int

+npe_fstat(int fd, struct npe_stat *buf)

+{

+	Dir *d;

+

+	if((d = dirfstat(fd)) == nil){

+		errno = ENOENT;

+		return -1;

+	}

+

+	buf->st_size = d->length;

+	buf->st_mtime = d->mtime;

+	buf->st_mode = d->mode & 0777;

+	if(d->mode & DMDIR)

+		buf->st_mode |= S_IFDIR;

+	else

+		buf->st_mode |= S_IFREG;

+

+	free(d);

+

+	return 0;

+}

--- a/libnpe/mkfile

+++ b/libnpe/mkfile

@@ -15,6 +15,7 @@

 	closedir.$O\

 	dirfd.$O\

 	dirname.$O\

+	fstat.$O\

 	exp2.$O\

 	fstatat.$O\

 	fts_children.$O\