probe for getspnam(), forkpty(), utmpx, replace sethostname()

Android is missing all of these; we need to probe for some so we have
a config symbol to depend on.
sethostname() is easily replaced.
We got termios.h via pty.h; now it's not included in configure-step tools,
so we need termios.h to generate globals.

13 files changed, 70 insertions, 9 deletions

diff --git a/lib/portability.c b/lib/portability.c
index d901a4b6..29608bc1 100644
--- a/lib/portability.c
+++ b/lib/portability.c
@@ -5,6 +5,9 @@
  */
 
 #include "toys.h"
+#if defined(__ANDROID__)
+#include <asm/unistd.h>
+#endif
 
 #if defined(__APPLE__) || defined(__ANDROID__)
 ssize_t getdelim(char **linep, size_t *np, int delim, FILE *stream)
@@ -61,6 +64,13 @@ ssize_t getline(char **linep, size_t *np, FILE *stream)
 }
 #endif
 
+#if defined(__ANDROID__)
+int sethostname(const char *name, size_t len)
+{
+  return syscall(__NR_sethostname, name, len);
+}
+#endif
+
 #if defined(__APPLE__)
 extern char **environ;
 
diff --git a/lib/portability.h b/lib/portability.h
index b7a7c794..5383efaa 100644
--- a/lib/portability.h
+++ b/lib/portability.h
@@ -180,10 +180,25 @@ ssize_t getline(char **lineptr, size_t *n, FILE *stream);
 #endif
 
 // Linux headers not listed by POSIX or LSB
-#include <shadow.h>
 #include <sys/mount.h>
 #include <sys/swap.h>
 
+// Android is missing some headers and functions
+#if defined(__ANDROID__)
+int sethostname(const char *name, size_t len);
+#endif
+// "generated/config.h" is included first
+#if defined(CFG_TOYBOX_SHADOW) && CFG_TOYBOX_SHADOW
+#include <shadow.h>
+#endif
+#if defined(CFG_TOYBOX_UTMPX) && CFG_TOYBOX_UTMPX
+#include <utmpx.h>
+#endif
+#if defined(CFG_TOYBOX_PTY) && CFG_TOYBOX_PTY
+#include <pty.h>
+#endif
+
+
 // Some systems don't define O_NOFOLLOW, and it varies by architecture, so...
 #include <fcntl.h>
 #ifndef O_NOFOLLOW
diff --git a/scripts/genconfig.sh b/scripts/genconfig.sh
index b50c32bb..e040aea5 100755
--- a/scripts/genconfig.sh
+++ b/scripts/genconfig.sh
@@ -44,6 +44,34 @@ EOF
 
     int main(int argc, char *argv[]) { return posix_fallocate(0,0,0); }
 EOF
+  
+  # Android and some other platforms miss utmpx
+  probesymbol TOYBOX_UTMPX -c << EOF
+    #include <utmpx.h>
+    #ifndef BOOT_TIME
+    #error nope
+    #endif
+    int main(int argc, char *argv[]) {
+      struct utmpx *a; 
+      if (0 != (a = getutxent())) return 0;
+      return 1;
+    }
+EOF
+
+  # Android is missing shadow.h and pty.h
+  probesymbol TOYBOX_PTY -c << EOF
+    #include <pty.h>
+    int main(int argc, char *argv[]) {
+      int master; return forkpty(&master, NULL, NULL, NULL);
+    }
+EOF
+
+  probesymbol TOYBOX_SHADOW -c << EOF
+    #include <shadow.h>
+    int main(int argc, char *argv[]) {
+      struct spwd *a = getspnam("root"); return 0;
+    }
+EOF
 }
 
 genconfig()
diff --git a/toys.h b/toys.h
index ed1fa811..6b5f87aa 100644
--- a/toys.h
+++ b/toys.h
@@ -41,10 +41,10 @@
 #include <sys/utsname.h>
 #include <sys/wait.h>
 #include <syslog.h>
+#include <termios.h>
 #include <time.h>
 #include <unistd.h>
 #include <utime.h>
-#include <utmpx.h>
 
 // Posix networking
 
@@ -64,7 +64,6 @@
 #include <wctype.h>
 
 // LSB 4.1 headers
-#include <pty.h>
 #include <sys/ioctl.h>
 #include <sys/statfs.h>
 #include <sys/sysinfo.h>
diff --git a/toys/lsb/passwd.c b/toys/lsb/passwd.c
index c92fb0d7..ca98f2ef 100644
--- a/toys/lsb/passwd.c
+++ b/toys/lsb/passwd.c
@@ -10,6 +10,7 @@ USE_PASSWD(NEWTOY(passwd, ">1a:dlu", TOYFLAG_STAYROOT|TOYFLAG_USR|TOYFLAG_BIN))
 config PASSWD
   bool "passwd"
   default y
+  depends on TOYBOX_SHADOW
   help
     usage: passwd [-a ALGO] [-dlu] <account name>
 
diff --git a/toys/lsb/su.c b/toys/lsb/su.c
index 268ddf75..616541b9 100644
--- a/toys/lsb/su.c
+++ b/toys/lsb/su.c
@@ -10,6 +10,7 @@ USE_SU(NEWTOY(su, "lmpc:s:", TOYFLAG_BIN|TOYFLAG_ROOTONLY))
 config SU
   bool "su"
   default y
+  depends on TOYBOX_SHADOW
   help
     usage: su [-lmp] [-c CMD] [-s SHELL] [USER [ARGS...]]
 
diff --git a/toys/other/login.c b/toys/other/login.c
index 09861644..91523d43 100644
--- a/toys/other/login.c
+++ b/toys/other/login.c
@@ -10,6 +10,7 @@ USE_LOGIN(NEWTOY(login, ">1fph:", TOYFLAG_BIN))
 config LOGIN
   bool "login"
   default y
+  depends on TOYBOX_SHADOW
   help
     usage: login [-p] [-h host] [[-f] username]
 
diff --git a/toys/other/netcat.c b/toys/other/netcat.c
index 485dda13..2c1ec7b2 100644
--- a/toys/other/netcat.c
+++ b/toys/other/netcat.c
@@ -26,6 +26,7 @@ config NETCAT_LISTEN
   bool "netcat server options (-let)"
   default y
   depends on NETCAT
+  depends on TOYBOX_PTY
   help
     usage: netcat [-t] [-lL COMMAND...]
 
diff --git a/toys/other/uptime.c b/toys/other/uptime.c
index adbbfc03..f584d9ab 100644
--- a/toys/other/uptime.c
+++ b/toys/other/uptime.c
@@ -25,17 +25,18 @@ void uptime_main(void)
   time_t tmptime;
   struct tm * now;
   unsigned int days, hours, minutes;
-  struct utmpx *entry;
-  int users = 0;
+  USE_TOYBOX_UTMPX(struct utmpx *entry;)
+  USE_TOYBOX_UTMPX(int users = 0;)
 
   // Obtain the data we need.
   sysinfo(&info);
   time(&tmptime);
   now = localtime(&tmptime);
+
   // Obtain info about logged on users
-  setutxent();
-  while ((entry = getutxent())) if (entry->ut_type == USER_PROCESS) users++;
-  endutxent();
+  USE_TOYBOX_UTMPX(setutxent();)
+  USE_TOYBOX_UTMPX(while ((entry = getutxent())) if (entry->ut_type == USER_PROCESS) users++;)
+  USE_TOYBOX_UTMPX(endutxent();)
 
   // Time
   xprintf(" %02d:%02d:%02d up ", now->tm_hour, now->tm_min, now->tm_sec);
@@ -48,7 +49,7 @@ void uptime_main(void)
   if (days) xprintf("%d day%s, ", days, (days!=1)?"s":"");
   if (hours) xprintf("%2d:%02d, ", hours, minutes);
   else printf("%d min, ", minutes);
-  printf(" %d user%s, ", users, (users!=1) ? "s" : "");
+  USE_TOYBOX_UTMPX(printf(" %d user%s, ", users, (users!=1) ? "s" : "");)
   printf(" load average: %.02f, %.02f, %.02f\n", info.loads[0]/65536.0,
     info.loads[1]/65536.0, info.loads[2]/65536.0);
 }
diff --git a/toys/other/w.c b/toys/other/w.c
index c271e8bd..a76c82f5 100644
--- a/toys/other/w.c
+++ b/toys/other/w.c
@@ -7,6 +7,7 @@ USE_W(NEWTOY(w, NULL, TOYFLAG_USR|TOYFLAG_BIN))
 config W
   bool "w"
   default y
+  depends on TOYBOX_UTMPX
   help
     usage: w
 
diff --git a/toys/pending/sulogin.c b/toys/pending/sulogin.c
index 45f76597..e6cb8314 100644
--- a/toys/pending/sulogin.c
+++ b/toys/pending/sulogin.c
@@ -13,6 +13,7 @@ USE_SULOGIN(NEWTOY(sulogin, "t#<0=0", TOYFLAG_SBIN|TOYFLAG_NEEDROOT))
 config SULOGIN
   bool "sulogin"
   default n
+  depends on TOYBOX_SHADOW
   help
     usage: sulogin [-t time] [tty]
 
diff --git a/toys/pending/telnetd.c b/toys/pending/telnetd.c
index 4198e63f..f9f34224 100644
--- a/toys/pending/telnetd.c
+++ b/toys/pending/telnetd.c
@@ -8,6 +8,7 @@ USE_TELNETD(NEWTOY(telnetd, "w#<0b:p#<0>65535=23f:l:FSKi[!wi]", TOYFLAG_USR|TOYF
 config TELNETD
   bool "telnetd"
   default n
+  depends on TOYBOX_PTY
   help
     Handle incoming telnet connections
 
diff --git a/toys/posix/who.c b/toys/posix/who.c
index 2c8a2e65..876a562a 100644
--- a/toys/posix/who.c
+++ b/toys/posix/who.c
@@ -14,6 +14,7 @@ USE_WHO(NEWTOY(who, "a", TOYFLAG_BIN))
 config WHO
   bool "who"
   default y
+  depends on TOYBOX_UTMPX
   help
     usage: who