Fake up enough headers to let libstddjb selfpipe build

Signed-off-by: Anders Kaseorg <andersk@mit.edu>

configure.ac

@@ -92,7 +92,7 @@ AC_FUNC_FORK
 AC_FUNC_MALLOC
 AC_FUNC_MBRTOWC
 AC_FUNC_REALLOC
-AC_CHECK_FUNCS([gettimeofday inet_ntoa iswprint memchr memset nl_langinfo setenv setlocale socket strchr strdup strerror strtol wcwidth])
+AC_CHECK_FUNCS([gettimeofday inet_ntoa iswprint memchr memset nl_langinfo setenv setlocale sigaction socket strchr strdup strerror strtol wcwidth])
 
 AC_SEARCH_LIBS([clock_gettime], [rt], [AC_DEFINE([HAVE_CLOCK_GETTIME], [1], [Define if clock_gettime is available.])])
 
@@ -101,6 +101,17 @@ AC_CHECK_DECL([mach_absolute_time],
      [Define if mach_absolute_time is available.])],
   , [[#include <mach/mach_time.h>]])
 
+AC_CHECK_DECL([pipe2],
+  [AC_DEFINE([HAVE_PIPE2], [1],
+     [Define if pipe2 is available.])],
+  , [[#define _GNU_SOURCE
+      #include <unistd.h>]])
+
+AC_CHECK_DECL([signalfd],
+  [AC_DEFINE([HAVE_SIGNALFD], [1],
+     [Define if signalfd is available.])],
+  , [[#include <sys/signalfd.h>]])
+
 AC_CHECK_DECL([htobe64],
   [AC_DEFINE([HAVE_HTOBE64], [1],
   [Define if htobe64 and friends exist.])],

third/libstddjb/djbunix.h

@@ -0,0 +1,17 @@
+/* ISC license. */
+
+#ifndef DJBUNIX_H
+#define DJBUNIX_H
+
+#define DJBUNIX_FLAG_NB  0x01U
+#define DJBUNIX_FLAG_COE 0x02U
+
+extern int coe (int) ;
+extern int ndelay_on (int) ;
+extern int pipe_internal (int *, unsigned int) ;
+#define pipenb(p) pipe_internal(p, DJBUNIX_FLAG_NB)
+#define pipecoe(p) pipe_internal(p, DJBUNIX_FLAG_COE)
+#define pipenbcoe(p) pipe_internal(p, DJBUNIX_FLAG_NB|DJBUNIX_FLAG_COE)
+extern int fd_close (int) ;
+
+#endif

third/libstddjb/error.h

@@ -0,0 +1,14 @@
+/* ISC license. */
+
+#ifndef ERROR_H
+#define ERROR_H
+
+#include <errno.h>
+#include "gccattributes.h"
+
+extern char const *error_str (int) gccattr_const ;
+extern int error_temp (int) gccattr_const ;
+
+#define error_isagain(e) (((e) == EAGAIN) || ((e) == EWOULDBLOCK))
+
+#endif

third/libstddjb/sysdeps.h

@@ -0,0 +1,24 @@
+#ifndef SYSDEPS_H
+#define SYSDEPS_H
+
+#include "config.h"
+
+#ifdef HAVE_PIPE2
+#define HASPIPE2
+#else
+#undef HASPIPE2
+#endif
+
+#ifdef HAVE_SIGNALFD
+#define HASSIGNALFD
+#else
+#undef HASSIGNALFD
+#endif
+
+#ifdef HAVE_SIGACTION
+#define HASSIGACTION
+#else
+#undef HASSIGACTION
+#endif
+
+#endif

third/libstddjb/uint64.h

@@ -0,0 +1,7 @@
+#ifndef UINT64_H
+#define UINT64_H
+
+#include <stdint.h>
+typedef uint64_t uint64;
+
+#endif