add NOMMU fixme's; move move_fd from runit_lib to libbb; nuke fd_copy

git-svn-id: svn://busybox.net/trunk/busybox@18237 69ca8d6d-28ef-0310-b511-8ec308f3f277

11 files changed, 31 insertions, 52 deletions

diff --git a/console-tools/openvt.c b/console-tools/openvt.c
index eb9f49fe2..0584584df 100644
--- a/console-tools/openvt.c
+++ b/console-tools/openvt.c
@@ -22,8 +22,9 @@ int openvt_main(int argc, char **argv)
                 bb_show_usage();
         }
         /* check for illegal vt number: < 1 or > 63 */
-        sprintf(vtname, VC_FORMAT, (int)xatoul_range(argv[1], 1, 63));
+        sprintf(vtname, VC_FORMAT, (int)xatou_range(argv[1], 1, 63));
 
+//FIXME NOMMU
         if (fork() == 0) {
                 /* child */
                 /* leave current vt (controlling tty) */
diff --git a/e2fsprogs/fsck.c b/e2fsprogs/fsck.c
index ad22fcd7a..c31ab3f1a 100644
--- a/e2fsprogs/fsck.c
+++ b/e2fsprogs/fsck.c
@@ -667,7 +667,8 @@ static void execute(const char *type, const char *device, const char *mntpt,
         /* Fork and execute the correct program. */
         pid = -1;
         if (!noexecute) {
-                pid = fork(); /* TODO: NOMMU friendly way (vfork)? */
+/* TODO: NOMMU friendly way (vfork)? */
+                pid = fork();
                 if (pid < 0)
                         bb_perror_msg_and_die("fork");
                 if (pid == 0) {
diff --git a/include/libbb.h b/include/libbb.h
index 152b87099..aba9316d1 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -250,8 +250,10 @@ extern char bb_process_escape_sequence(const char **ptr);
 /* TODO: sometimes modifies its parameter, which
  * makes it rather inconvenient at times: */
 extern char *bb_get_last_path_component(char *path);
-extern int ndelay_on(int fd);
-extern int ndelay_off(int fd);
+
+int ndelay_on(int fd);
+int ndelay_off(int fd);
+void xmove_fd(int, int);
 
 
 extern DIR *xopendir(const char *path);
@@ -616,6 +618,8 @@ extern int index_in_substr_array(const char * const string_array[], const char *
 extern void print_login_issue(const char *issue_file, const char *tty);
 extern void print_login_prompt(void);
 #ifdef BB_NOMMU
+extern pid_t BUG_fork_is_unavailable_on_nommu(void);
+#define fork() BUG_fork_is_unavailable_on_nommu()
 extern void vfork_daemon_rexec(int nochdir, int noclose, char **argv);
 extern smallint re_execed;
 #endif
diff --git a/libbb/xfuncs.c b/libbb/xfuncs.c
index c496f9a22..1dcdbc065 100644
--- a/libbb/xfuncs.c
+++ b/libbb/xfuncs.c
@@ -133,6 +133,16 @@ int ndelay_off(int fd)
         return fcntl(fd,F_SETFL,fcntl(fd,F_GETFL,0) & ~O_NONBLOCK);
 }
 
+// "Renumber" opened fd
+void xmove_fd(int from, int to)
+{
+        if (from == to)
+                return;
+        if (dup2(from, to) != to)
+                bb_perror_msg_and_die("cannot duplicate file descriptor");
+        close(from);
+}
+
 // Die with an error message if we can't write the entire buffer.
 void xwrite(int fd, const void *buf, size_t count)
 {
diff --git a/loginutils/login.c b/loginutils/login.c
index b7428de45..791e44d83 100644
--- a/loginutils/login.c
+++ b/loginutils/login.c
@@ -337,7 +337,7 @@ auth_failed:
         fchown(0, pw->pw_uid, pw->pw_gid);
         fchmod(0, 0600);
 
-        /* TODO: be nommu-friendly, use spawn? */
+/* TODO: be nommu-friendly, use spawn? */
         if (ENABLE_LOGIN_SCRIPTS) {
                 char *script = getenv("LOGIN_PRE_SUID_SCRIPT");
                 if (script) {
diff --git a/networking/zcip.c b/networking/zcip.c
index a8bfee65a..c50d5abaf 100644
--- a/networking/zcip.c
+++ b/networking/zcip.c
@@ -272,6 +272,7 @@ int zcip_main(int argc, char *argv[])
         // daemonize now; don't delay system startup
         if (!FOREGROUND) {
                 /* bb_daemonize(); - bad, will close fd! */
+//NOMMU
                 xdaemon(0, 0);
                 bb_info_msg("start, interface %s", intf);
         }
diff --git a/runit/runit_lib.c b/runit/runit_lib.c
index 0830314df..4762096b4 100644
--- a/runit/runit_lib.c
+++ b/runit/runit_lib.c
@@ -61,34 +61,6 @@ int coe(int fd)
 }
 
 
-/*** fd_copy.c ***/
-
-int fd_copy(int to,int from)
-{
-        if (to == from)
-                return 0;
-        if (fcntl(from,F_GETFL,0) == -1)
-                return -1;
-        close(to);
-        if (fcntl(from,F_DUPFD,to) == -1)
-                return -1;
-        return 0;
-}
-
-
-/*** fd_move.c ***/
-
-int fd_move(int to,int from)
-{
-        if (to == from)
-                return 0;
-        if (fd_copy(to,from) == -1)
-                return -1;
-        close(from);
-        return 0;
-}
-
-
 /*** fmt_ptime.c ***/
 
 void fmt_ptime30nul(char *s, struct taia *ta) {
diff --git a/runit/runit_lib.h b/runit/runit_lib.h
index 7b268e276..9fe4166bc 100644
--- a/runit/runit_lib.h
+++ b/runit/runit_lib.h
@@ -40,12 +40,6 @@ extern int coe(int);
 #define direntry struct dirent
 
 
-/*** fd.h ***/
-
-extern int fd_copy(int,int);
-extern int fd_move(int,int);
-
-
 /*** tai.h ***/
 
 struct tai {
diff --git a/runit/runsv.c b/runit/runsv.c
index cd806851e..018456847 100644
--- a/runit/runsv.c
+++ b/runit/runsv.c
@@ -251,7 +251,7 @@ static unsigned custom(struct svdir *s, char c)
                                 return 0;
                         }
                         if (!pid) {
-                                if (haslog && fd_copy(1, logpipe[1]) == -1)
+                                if (haslog && dup2(logpipe[1], 1) == -1)
                                         warn_cannot("setup stdout for control/?");
                                 prog[0] = a;
                                 prog[1] = NULL;
@@ -312,13 +312,13 @@ static void startservice(struct svdir *s)
                 /* child */
                 if (haslog) {
                         if (s->islog) {
-                                if (fd_copy(0, logpipe[0]) == -1)
+                                if (dup2(logpipe[0], 0) == -1)
                                         fatal_cannot("setup filedescriptor for ./log/run");
                                 close(logpipe[1]);
                                 if (chdir("./log") == -1)
                                         fatal_cannot("change directory to ./log");
                         } else {
-                                if (fd_copy(1, logpipe[1]) == -1)
+                                if (dup2(logpipe[1], 1) == -1)
                                         fatal_cannot("setup filedescriptor for ./run");
                                 close(logpipe[0]);
                         }
diff --git a/runit/runsvdir.c b/runit/runsvdir.c
index 2f54cfef8..cce2c5d9c 100644
--- a/runit/runsvdir.c
+++ b/runit/runsvdir.c
@@ -191,7 +191,7 @@ static int setup_log(void)
         coe(logpipe[0]);
         ndelay_on(logpipe[0]);
         ndelay_on(logpipe[1]);
-        if (fd_copy(2, logpipe[1]) == -1) {
+        if (dup2(logpipe[1], 2) == -1) {
                 warnx("cannot set filedescriptor for log");
                 return -1;
         }
diff --git a/runit/svlogd.c b/runit/svlogd.c
index e454bace8..fb834a403 100644
--- a/runit/svlogd.c
+++ b/runit/svlogd.c
@@ -153,12 +153,10 @@ static unsigned processorstart(struct logdir *ld)
                 if (verbose)
                         bb_error_msg(INFO"processing: %s/%s", ld->name, ld->fnsave);
                 fd = xopen(ld->fnsave, O_RDONLY|O_NDELAY);
-                if (fd_move(0, fd) == -1)
-                        bb_perror_msg_and_die(FATAL"cannot %s processor %s", "move filedescriptor for", ld->name);
+                xmove_fd(fd, 0);
                 ld->fnsave[26] = 't';
                 fd = xopen(ld->fnsave, O_WRONLY|O_NDELAY|O_TRUNC|O_CREAT);
-                if (fd_move(1, fd) == -1)
-                        bb_perror_msg_and_die(FATAL"cannot %s processor %s", "move filedescriptor for", ld->name);
+                xmove_fd(fd, 1);
                 fd = open_read("state");
                 if (fd == -1) {
                         if (errno != ENOENT)
@@ -166,17 +164,15 @@ static unsigned processorstart(struct logdir *ld)
                         close(xopen("state", O_WRONLY|O_NDELAY|O_TRUNC|O_CREAT));
                         fd = xopen("state", O_RDONLY|O_NDELAY);
                 }
-                if (fd_move(4, fd) == -1)
-                        bb_perror_msg_and_die(FATAL"cannot %s processor %s", "move filedescriptor for", ld->name);
+                xmove_fd(fd, 4);
                 fd = xopen("newstate", O_WRONLY|O_NDELAY|O_TRUNC|O_CREAT);
-                if (fd_move(5, fd) == -1)
-                        bb_perror_msg_and_die(FATAL"cannot %s processor %s", "move filedescriptor for", ld->name);
+                xmove_fd(fd, 5);
 
 // getenv("SHELL")?
                 prog[0] = (char*)"sh";
                 prog[1] = (char*)"-c";
                 prog[2] = ld->processor;
-                prog[3] = '\0';
+                prog[3] = NULL;
                 execve("/bin/sh", prog, environ);
                 bb_perror_msg_and_die(FATAL"cannot %s processor %s", "run", ld->name);
         }