diff options
| -rw-r--r-- | shell/ash.c | 4 | ||||
| -rw-r--r-- | shell/hush.c | 124 | ||||
| -rw-r--r-- | shell/lash_unused.c | 5 | ||||
| -rw-r--r-- | shell/msh.c | 6 |
4 files changed, 75 insertions, 64 deletions
diff --git a/shell/ash.c b/shell/ash.c index 1cd2050..fe8c1be 100644 --- a/shell/ash.c +++ b/shell/ash.c @@ -12230,7 +12230,9 @@ helpcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM) unsigned col; unsigned i; - out1fmt("\nBuilt-in commands:\n-------------------\n"); + out1fmt("\n" + "Built-in commands:\n" + "------------------\n"); for (col = 0, i = 0; i < ARRAY_SIZE(builtintab); i++) { col += out1fmt("%c%s", ((col == 0) ? '\t' : ' '), builtintab[i].name + 1); diff --git a/shell/hush.c b/shell/hush.c index 61db928..c384202 100644 --- a/shell/hush.c +++ b/shell/hush.c @@ -363,11 +363,13 @@ struct parse_context { /* bitmask of FLAG_xxx, for figuring out valid reserved words */ int old_flag; /* group we are enclosed in: - * example 1: "{ { false; ..." - * example 2: "if true; then { false; ..." - * example 3: "if true; then if false; ..." - * when we find closing "}" / "fi" / whatever, we move list_head - * into stack->command->group and delete ourself. + * example: "if pipe1; pipe2; then pipe3; fi" + * when we see "if" or "then", we malloc and copy current context, + * and make ->stack point to it. then we parse pipeN. + * when closing "then" / fi" / whatever is found, + * we move list_head into ->stack->command->group, + * copy ->stack into current context, and delete ->stack. + * (parsing of { list } and ( list ) doesn't use this method) */ struct parse_context *stack; #endif @@ -532,7 +534,6 @@ static int builtin_wait(char **argv); static int builtin_break(char **argv); static int builtin_continue(char **argv); #endif -//static int builtin_not_written(char **argv); /* Table of built-in functions. They can be forked or not, depending on * context: within pipes, they fork. As simple commands, they do not. @@ -554,42 +555,44 @@ struct built_in_command { /* For now, echo and test are unconditionally enabled. * Maybe make it configurable? */ static const struct built_in_command bltins[] = { - BLTIN("." , builtin_source, "Run commands in a file"), - BLTIN(":" , builtin_true, "No-op"), - BLTIN("[" , builtin_test, "Test condition"), + BLTIN("." , builtin_source , "Run commands in a file"), + BLTIN(":" , builtin_true , "No-op"), + BLTIN("[" , builtin_test , "Test condition"), #if ENABLE_HUSH_JOB - BLTIN("bg" , builtin_fg_bg, "Resume a job in the background"), + BLTIN("bg" , builtin_fg_bg , "Resume a job in the background"), #endif #if ENABLE_HUSH_LOOPS - BLTIN("break" , builtin_break, "Exit from a loop"), + BLTIN("break" , builtin_break , "Exit from a loop"), #endif - BLTIN("cd" , builtin_cd, "Change directory"), + BLTIN("cd" , builtin_cd , "Change directory"), #if ENABLE_HUSH_LOOPS BLTIN("continue", builtin_continue, "Start new loop iteration"), #endif - BLTIN("echo" , builtin_echo, "Write to stdout"), - BLTIN("eval" , builtin_eval, "Construct and run shell command"), - BLTIN("exec" , builtin_exec, "Execute command, don't return to shell"), - BLTIN("exit" , builtin_exit, "Exit"), - BLTIN("export", builtin_export, "Set environment variable"), + BLTIN("echo" , builtin_echo , "Write to stdout"), + BLTIN("eval" , builtin_eval , "Construct and run shell command"), + BLTIN("exec" , builtin_exec , "Execute command, don't return to shell"), + BLTIN("exit" , builtin_exit , "Exit"), + BLTIN("export" , builtin_export , "Set environment variable"), #if ENABLE_HUSH_JOB - BLTIN("fg" , builtin_fg_bg, "Bring job into the foreground"), - BLTIN("jobs" , builtin_jobs, "List active jobs"), -#endif - BLTIN("pwd" , builtin_pwd, "Print current directory"), - BLTIN("read" , builtin_read, "Input environment variable"), -// BLTIN("return", builtin_not_written, "Return from a function"), - BLTIN("set" , builtin_set, "Set/unset shell local variables"), - BLTIN("shift" , builtin_shift, "Shift positional parameters"), - BLTIN("test" , builtin_test, "Test condition"), - BLTIN("trap" , builtin_trap, "Trap signals"), -// BLTIN("ulimit", builtin_not_written, "Control resource limits"), - BLTIN("umask" , builtin_umask, "Set file creation mask"), - BLTIN("unset" , builtin_unset, "Unset environment variable"), - BLTIN("wait" , builtin_wait, "Wait for process"), + BLTIN("fg" , builtin_fg_bg , "Bring job into the foreground"), +#endif #if ENABLE_HUSH_HELP - BLTIN("help" , builtin_help, "List shell built-in commands"), + BLTIN("help" , builtin_help , "List shell built-in commands"), #endif +#if ENABLE_HUSH_JOB + BLTIN("jobs" , builtin_jobs , "List active jobs"), +#endif + BLTIN("pwd" , builtin_pwd , "Print current directory"), + BLTIN("read" , builtin_read , "Input environment variable"), +// BLTIN("return" , builtin_return , "Return from a function"), + BLTIN("set" , builtin_set , "Set/unset shell local variables"), + BLTIN("shift" , builtin_shift , "Shift positional parameters"), + BLTIN("test" , builtin_test , "Test condition"), + BLTIN("trap" , builtin_trap , "Trap signals"), +// BLTIN("ulimit" , builtin_return , "Control resource limits"), + BLTIN("umask" , builtin_umask , "Set file creation mask"), + BLTIN("unset" , builtin_unset , "Unset environment variable"), + BLTIN("wait" , builtin_wait , "Wait for process"), }; @@ -2117,7 +2120,7 @@ static void restore_redirects(int squirrel[]) #endif static void free_pipe_list(struct pipe *head, int indent); -/* return code is the exit status of the pipe */ +/* Return code is the exit status of the pipe */ static void free_pipe(struct pipe *pi, int indent) { char **p; @@ -2125,7 +2128,7 @@ static void free_pipe(struct pipe *pi, int indent) struct redir_struct *r, *rnext; int a, i; - if (pi->stopped_cmds > 0) + if (pi->stopped_cmds > 0) /* why? */ return; debug_printf_clean("%s run pipe: (pid %d)\n", indenter(indent), getpid()); for (i = 0; i < pi->num_cmds; i++) { @@ -2216,9 +2219,7 @@ static void pseudo_exec_argv(nommu_save_t *nommu_save, char **new_env; const struct built_in_command *x; - /* If a variable is assigned in a forest, and nobody listens, - * was it ever really set? - */ + /* Case when we are here: ... | var=val | ... */ if (!argv[assignment_cnt]) _exit(EXIT_SUCCESS); @@ -2239,8 +2240,13 @@ static void pseudo_exec_argv(nommu_save_t *nommu_save, #endif } - /* - * Check if the command matches any of the builtins. + /* On NOMMU, we must never block! + * Example: { sleep 99999 | read line } & echo Ok + * read builtin will block on read syscall, leaving parent blocked + * in vfork. Therefore we can't do this: + */ +#if BB_MMU + /* Check if the command matches any of the builtins. * Depending on context, this might be redundant. But it's * easier to waste a few CPU cycles than it is to figure out * if this is one of those cases. @@ -2249,33 +2255,35 @@ static void pseudo_exec_argv(nommu_save_t *nommu_save, if (strcmp(argv[0], x->cmd) == 0) { debug_printf_exec("running builtin '%s'\n", argv[0]); rcode = x->function(argv); - fflush(stdout); + fflush(NULL); _exit(rcode); } } +#endif - /* Check if the command matches any busybox applets */ #if ENABLE_FEATURE_SH_STANDALONE + /* Check if the command matches any busybox applets */ if (strchr(argv[0], '/') == NULL) { int a = find_applet_by_name(argv[0]); if (a >= 0) { +#if BB_MMU /* see above why on NOMMU it is not allowed */ if (APPLET_IS_NOEXEC(a)) { debug_printf_exec("running applet '%s'\n", argv[0]); -// is it ok that run_applet_no_and_exit() does exit(), not _exit()? run_applet_no_and_exit(a, argv); } - /* re-exec ourselves with the new arguments */ +#endif + /* Re-exec ourselves */ debug_printf_exec("re-execing applet '%s'\n", argv[0]); - execvp(bb_busybox_exec_path, argv); + sigprocmask(SIG_SETMASK, &G.inherited_set, NULL); + execv(bb_busybox_exec_path, argv); /* If they called chroot or otherwise made the binary no longer * executable, fall through */ } } #endif - sigprocmask(SIG_SETMASK, &G.inherited_set, NULL); - debug_printf_exec("execing '%s'\n", argv[0]); + sigprocmask(SIG_SETMASK, &G.inherited_set, NULL); execvp(argv[0], argv); bb_perror_msg("can't exec '%s'", argv[0]); _exit(EXIT_FAILURE); @@ -2317,8 +2325,8 @@ static void pseudo_exec(nommu_save_t *nommu_save, #endif } - /* Can happen. See what bash does with ">foo" by itself. */ - debug_printf("pseudo_exec'ed null command\n"); + /* Case when we are here: ... | >file */ + debug_printf_exec("pseudo_exec'ed null command\n"); _exit(EXIT_SUCCESS); } @@ -2569,8 +2577,8 @@ static int checkjobs_and_fg_shell(struct pipe* fg_pipe) } #endif -/* run_pipe() starts all the jobs, but doesn't wait for anything - * to finish. See checkjobs(). +/* Start all the jobs, but don't wait for anything to finish. + * See checkjobs(). * * Return code is normally -1, when the caller has to wait for children * to finish to determine the exit status of the pipe. If the pipe @@ -2588,7 +2596,7 @@ static int checkjobs_and_fg_shell(struct pipe* fg_pipe) * cmd || ... { list } || ... * If it is, then we can run cmd as a builtin, NOFORK [do we do this?], * or (if SH_STANDALONE) an applet, and we can run the { list } - * with run_list(). Otherwise, we fork and exec cmd. + * with run_list(). If it isn't one of these, we fork and exec cmd. * * Cases when we must fork: * non-single: cmd | cmd @@ -3771,7 +3779,7 @@ static FILE *generate_stream_from_string(const char *s) * echo OK */ //TODO: pass non-exported variables, traps, and functions - execl(CONFIG_BUSYBOX_EXEC_PATH, "hush", "-c", s, NULL); + execl(bb_busybox_exec_path, "hush", "-c", s, NULL); _exit(127); #endif } @@ -5144,7 +5152,7 @@ static int builtin_fg_bg(char **argv) found: // TODO: bash prints a string representation // of job being foregrounded (like "sleep 1 | cat") - if (*argv[0] == 'f') { + if (argv[0][0] == 'f') { /* Put the job into the foreground. */ tcsetpgrp(G_interactive_fd, pi->pgrp); } @@ -5162,12 +5170,11 @@ static int builtin_fg_bg(char **argv) if (errno == ESRCH) { delete_finished_bg_job(pi); return EXIT_SUCCESS; - } else { - bb_perror_msg("kill (SIGCONT)"); } + bb_perror_msg("kill (SIGCONT)"); } - if (*argv[0] == 'f') { + if (argv[0][0] == 'f') { remove_bg_job(pi); return checkjobs_and_fg_shell(pi); } @@ -5180,8 +5187,9 @@ static int builtin_help(char **argv UNUSED_PARAM) { const struct built_in_command *x; - printf("\nBuilt-in commands:\n"); - printf("-------------------\n"); + printf("\n" + "Built-in commands:\n" + "------------------\n"); for (x = bltins; x != &bltins[ARRAY_SIZE(bltins)]; x++) { printf("%s\t%s\n", x->cmd, x->descr); } diff --git a/shell/lash_unused.c b/shell/lash_unused.c index 90b1f56..21ea547 100644 --- a/shell/lash_unused.c +++ b/shell/lash_unused.c @@ -312,8 +312,9 @@ static int builtin_help(struct child_prog UNUSED_PARAM *dummy) { const struct built_in_command *x; - printf("\nBuilt-in commands:\n" - "-------------------\n"); + printf("\n" + "Built-in commands:\n" + "------------------\n"); for (x = bltins; x <= &VEC_LAST(bltins); x++) { if (x->descr == NULL) continue; diff --git a/shell/msh.c b/shell/msh.c index 5f8c90e..da1dc35 100644 --- a/shell/msh.c +++ b/shell/msh.c @@ -35,7 +35,6 @@ # include <assert.h> # define bb_dev_null "/dev/null" # define DEFAULT_SHELL "/proc/self/exe" -# define CONFIG_BUSYBOX_EXEC_PATH "/proc/self/exe" # define bb_banner "busybox standalone" # define ENABLE_FEATURE_SH_STANDALONE 0 # define bb_msg_memory_exhausted "memory exhausted" @@ -3176,8 +3175,9 @@ static int dohelp(struct op *t UNUSED_PARAM, char **args UNUSED_PARAM) int col; const struct builtincmd *x; - puts("\nBuilt-in commands:\n" - "-------------------"); + printf("\n" + "Built-in commands:\n" + "------------------\n"); col = 0; x = builtincmds; |