Simplify preprocessor conditions to enable building on musl-libc - 9base - revived minimalist port of Plan 9 userland to Unix

git clone git://git.suckless.org/9base

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---

commit a71862d4fff6274e7b59e5d6381a05d8a1db579b

parent 45d1314a1bd1886c42c1bdaac4a0128f23f50e32

Author: sin 

Date:   Mon,  3 Mar 2014 10:59:34 +0000

Simplify preprocessor conditions to enable building on musl-libc

musl-libc does not export __MUSL__ so we cannot use that.  I've
chosen to go with the common solution here that works on uClibc,
glibc and musl-libc by just using syscall(2) and getdents(2).

To build 9base, you will need the appropriate kernel headers in
place.

Diffstat:
  M lib9/_p9dir.c                       |       2 +-
  M lib9/dirread.c                      |      22 +---------------------
  M lib9/readcons.c                     |       3 ---

3 files changed, 2 insertions(+), 25 deletions(-)
---

diff --git a/lib9/_p9dir.c b/lib9/_p9dir.c

@@ -61,7 +61,7 @@ disksize(int fd, struct stat *st)
         return (vlong)lab.d_partitions[n].p_size * lab.d_secsize;
 }
 
-#elif defined(__linux__) && !defined(__MUSL__)
+#elif defined(__linux__)
 #include 
 #include 
 #include 

diff --git a/lib9/dirread.c b/lib9/dirread.c

@@ -4,7 +4,7 @@
 #include 
 #include 
 
-#if defined (__UCLIBC__)
+#if defined (__linux__)
 # include 
 # if defined (__USE_LARGEFILE64)
 #  define getdents SYS_getdents64
@@ -16,30 +16,10 @@
 extern int _p9dir(struct stat*, struct stat*, char*, Dir*, char**, char*);
 
 #if defined(__linux__)
-# if defined (__UCLIBC__)
 static int
 mygetdents(int fd, struct dirent *buf, int n) {
   return syscall (getdents, fd, (void*) buf, n);
 }
-# elif defined(__MUSL__)
-static int
-mygetdents(int fd, struct dirent *buf, int n)
-{
-        return getdents(fd, (void*)buf, n);
-}
-# else
-static int
-mygetdents(int fd, struct dirent *buf, int n)
-{
-        off_t off;
-        int nn;
-
-        /* This doesn't match the man page, but it works in Debian with a 2.2 kernel */
-        off = p9seek(fd, 0, 1);
-        nn = getdirentries(fd, (void*)buf, n, &off);
-        return nn;
-}
-# endif
 #elif defined(__APPLE__) || defined(__FreeBSD__)
 static int
 mygetdents(int fd, struct dirent *buf, int n)

diff --git a/lib9/readcons.c b/lib9/readcons.c

@@ -2,9 +2,6 @@
 #define NOPLAN9DEFINES
 #include 
 #include 
-#ifndef __MUSL__
-# include 
-#endif
 
 static int
 rawx(int fd, int echoing)