pass a copy of argv[i] to NOFORK applets (they may permute it etc).

set/save/restore more shared global variables whan call one applet from another


git-svn-id: svn://busybox.net/trunk/busybox@18415 69ca8d6d-28ef-0310-b511-8ec308f3f277

5 files changed, 38 insertions, 30 deletions

diff --git a/applets/applets.c b/applets/applets.c
index bbb545a84..82a7eeea1 100644
--- a/applets/applets.c
+++ b/applets/applets.c
@@ -33,7 +33,7 @@
 
 #if ENABLE_SHOW_USAGE && !ENABLE_FEATURE_COMPRESS_USAGE
 /* Define usage_messages[] */
-static const char usage_messages[] =
+static const char usage_messages[] = ""
 #define MAKE_USAGE
 #include "usage.h"
 #include "applets.h"
@@ -590,6 +590,10 @@ static int busybox_main(int argc, char **argv)
 
 void run_current_applet_and_exit(int argc, char **argv)
 {
+        /* Reinit some shared global data */
+        optind = 1;
+        xfunc_error_retval = EXIT_FAILURE;
+
         applet_name = current_applet->name;
         if (argc == 2 && !strcmp(argv[1], "--help"))
                 bb_show_usage();
diff --git a/libbb/vfork_daemon_rexec.c b/libbb/vfork_daemon_rexec.c
index ce5a627ed..7dbc152e2 100644
--- a/libbb/vfork_daemon_rexec.c
+++ b/libbb/vfork_daemon_rexec.c
@@ -119,11 +119,16 @@ int spawn_and_wait(char **argv)
                 if (a->nofork)
 #endif
                 {
-                        int old_sleep = die_sleep;
+                        /* Save some shared globals */
+                        const struct bb_applet *old_a = current_applet;
                         int old_x = xfunc_error_retval;
                         uint32_t old_m = option_mask32;
+                        int old_sleep = die_sleep;
 
+                        current_applet = a;
+                        applet_name = a->name;
                         xfunc_error_retval = EXIT_FAILURE;
+                        /*option_mask32 = 0; - not needed */
                         /* special flag for xfunc_die(). If xfunc will "die"
                          * in NOFORK applet, xfunc_die() sees negative
                          * die_sleep and longjmp here instead. */
@@ -131,25 +136,24 @@ int spawn_and_wait(char **argv)
 
                         rc = setjmp(die_jmp);
                         if (!rc) {
-                                const struct bb_applet *old_a = current_applet;
-                                current_applet = a;
-                                applet_name = a->name;
-// what else should we save/restore?
-// TODO: what if applet will mangle argv vector?
-// xargs needs argv untouched because it frees argv[i]!
-// shouldn't we pass a copy?
-                                rc = a->main(argc, argv);
-                                current_applet = old_a;
-                                applet_name = old_a->name;                                      
-                        } else {
-                                /* xfunc died in NOFORK applet */
+                                /* Some callers (xargs)
+                                 * need argv untouched because they free argv[i]! */
+                                char *tmp_argv[argc+1];
+                                memcpy(tmp_argv, argv, (argc+1) * sizeof(tmp_argv[0]));
+                                /* Finally we can call NOFORK applet's main() */
+                                rc = a->main(argc, tmp_argv);
+                        } else { /* xfunc died in NOFORK applet */
+                                /* in case they meant to return 0... */
                                 if (rc == -111)
                                         rc = 0;
                         }
 
-                        die_sleep = old_sleep;
+                        /* Restoring globals */
+                        current_applet = old_a;
+                        applet_name = old_a->name;                                      
                         xfunc_error_retval = old_x;
                         option_mask32 = old_m;
+                        die_sleep = old_sleep;
                         return rc;
                 }
 #if BB_MMU
diff --git a/shell/hush.c b/shell/hush.c
index 1ad61e54e..9af7f5105 100644
--- a/shell/hush.c
+++ b/shell/hush.c
@@ -1119,8 +1119,7 @@ static void pseudo_exec(struct child_prog *child)
 
                         /* Count argc for use in a second... */
                         for (argc_l = 0; *argv_l; argv_l++, argc_l++)
-                                /**/;
-                        optind = 1;
+                                continue;
                         debug_printf("running applet %s\n", name);
                         run_applet_and_exit(name, argc_l, child->argv);
                 }
diff --git a/shell/lash.c b/shell/lash.c
index c72a65639..5f2dacd18 100644
--- a/shell/lash.c
+++ b/shell/lash.c
@@ -32,6 +32,7 @@
 #define ENABLE_LASH_PIPE_N_REDIRECTS 1
 #define ENABLE_LASH_JOB_CONTROL      1
 
+
 enum { MAX_READ = 128 }; /* size of input buffer for 'read' builtin */
 #define JOB_STATUS_FORMAT "[%d] %-22s %.40s\n"
 
@@ -310,7 +311,7 @@ static int builtin_help(struct child_prog ATTRIBUTE_UNUSED *dummy)
         const struct built_in_command *x;
 
         printf("\nBuilt-in commands:\n"
-                   "-------------------\n");
+               "-------------------\n");
         for (x = bltins; x->cmd; x++) {
                 if (x->descr == NULL)
                         continue;
@@ -408,12 +409,12 @@ static int builtin_read(struct child_prog *child)
                 ** the string resides in a static buffer!)
                 */
                 res = -1;
-                if ((s = strdup(string)))
+                s = strdup(string);
+                if (s)
                         res = putenv(s);
                 if (res)
                         bb_perror_msg("read");
-        }
-        else
+        } else
                 fgets(string, sizeof(string), stdin);
 
         return res;
@@ -1167,8 +1168,8 @@ static int pseudo_exec(struct child_prog *child)
                 char **argv_l = child->argv;
                 int argc_l;
 
-                for (argc_l = 0; *argv_l; argv_l++, argc_l++);
-                optind = 1;
+                for (argc_l = 0; *argv_l; argv_l++, argc_l++)
+                        continue;
                 run_applet_and_exit(child->argv[0], argc_l, child->argv);
         }
 
@@ -1234,7 +1235,7 @@ static int run_command(struct job *newjob, int inbg, int outpipe[2])
 
         nextin = 0, nextout = 1;
         for (i = 0; i < newjob->num_progs; i++) {
-                child = & (newjob->progs[i]);
+                child = &(newjob->progs[i]);
 
                 if ((i + 1) < newjob->num_progs) {
                         if (pipe(pipefds) < 0)
@@ -1275,11 +1276,11 @@ static int run_command(struct job *newjob, int inbg, int outpipe[2])
                 }
 
 #if !defined(__UCLIBC__) || defined(__ARCH_HAS_MMU__)
-                if (!(child->pid = fork()))
+                child->pid = fork();
 #else
-                if (!(child->pid = vfork()))
+                child->pid = vfork();
 #endif
-                {
+                if (!child->pid) {
                         /* Set the handling for job control signals back to the default.  */
                         signal(SIGINT, SIG_DFL);
                         signal(SIGQUIT, SIG_DFL);
@@ -1473,8 +1474,9 @@ static void setup_job_control(void)
         pid_t shell_pgrp;
 
         /* Loop until we are in the foreground.  */
-        while ((status = tcgetpgrp (shell_terminal)) >= 0) {
-                if (status == (shell_pgrp = getpgrp ())) {
+        while ((status = tcgetpgrp(shell_terminal)) >= 0) {
+                shell_pgrp = getpgrp();
+                if (status == shell_pgrp) {
                         break;
                 }
                 kill(- shell_pgrp, SIGTTIN);
diff --git a/shell/msh.c b/shell/msh.c
index 4d1e84cf0..861abe234 100644
--- a/shell/msh.c
+++ b/shell/msh.c
@@ -3065,7 +3065,6 @@ static const char *rexecve(char *c, char **v, char **envp)
         char *name = c;
 
         if (ENABLE_FEATURE_SH_STANDALONE) {
-                optind = 1;
                 if (find_applet_by_name(name)) {
                         /* We have to exec here since we vforked.  Running
                          * run_applet_and_exit() won't work and bad things