mirror of
https://github.com/topjohnwu/ndk-busybox.git
synced 2024-12-02 00:36:20 +00:00
More hush updates from Larry:
Update some comments. Generate partial placeholders for the missing
builtins. Write builtin_umask. Properly treat exec without arguments
as a means to open/close files within the running script. Implement
"4<&-" that encodes for file descriptor closure.
This commit is contained in:
Eric Andersen
parent
7e1273edf7
commit
83a2ae2184
73
hush.c
73
hush.c
@ -45,24 +45,25 @@
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* fancy forms of Parameter Expansion
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* Arithmetic Expansion
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* <(list) and >(list) Process Substitution
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* reserved words: case, esac, function
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* reserved words: case, esac, select, function
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* Here Documents ( << word )
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* Functions
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* Major bugs:
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* job handling woefully incomplete and buggy
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* reserved word execution woefully incomplete and buggy
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* to-do:
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* port selected bugfixes from post-0.49 busybox lash
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* finish implementing reserved words
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* port selected bugfixes from post-0.49 busybox lash - done?
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* finish implementing reserved words: for, while, until, do, done
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* change { and } from special chars to reserved words
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* builtins: break, continue, eval, return, set, trap, ulimit
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* test magic exec
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* handle children going into background
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* clean up recognition of null pipes
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* have builtin_exec set flag to avoid restore_redirects
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* figure out if "echo foo}" is fixable
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* check setting of global_argc and global_argv
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* control-C handling, probably with longjmp
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* VAR=value prefix for simple commands
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* follow IFS rules more precisely, including update semantics
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* write builtin_eval, builtin_ulimit, builtin_umask
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* figure out what to do with backslash-newline
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* explain why we use signal instead of sigaction
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* propagate syntax errors, die on resource errors?
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@ -97,6 +98,7 @@
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#include <fcntl.h>
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#include <getopt.h> /* should be pretty obvious */
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#include <sys/stat.h> /* ulimit */
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <signal.h>
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@ -323,9 +325,9 @@ static int builtin_pwd(struct child_prog *child);
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static int builtin_read(struct child_prog *child);
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static int builtin_shift(struct child_prog *child);
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static int builtin_source(struct child_prog *child);
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static int builtin_ulimit(struct child_prog *child);
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static int builtin_umask(struct child_prog *child);
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static int builtin_unset(struct child_prog *child);
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static int builtin_not_written(struct child_prog *child);
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/* o_string manipulation: */
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static int b_check_space(o_string *o, int len);
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static int b_addchr(o_string *o, int ch);
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@ -390,8 +392,11 @@ static void free_pipe(struct pipe *pi);
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* still be set at the end. */
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static struct built_in_command bltins[] = {
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{"bg", "Resume a job in the background", builtin_fg_bg},
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{"break", "Exit for, while or until loop", builtin_not_written},
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{"cd", "Change working directory", builtin_cd},
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{"continue", "Continue for, while or until loop", builtin_not_written},
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{"env", "Print all environment variables", builtin_env},
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{"eval", "Construct and run shell command", builtin_not_written},
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{"exec", "Exec command, replacing this shell with the exec'd process", builtin_exec},
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{"exit", "Exit from shell()", builtin_exit},
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{"export", "Set environment variable", builtin_export},
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@ -399,8 +404,11 @@ static struct built_in_command bltins[] = {
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{"jobs", "Lists the active jobs", builtin_jobs},
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{"pwd", "Print current directory", builtin_pwd},
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{"read", "Input environment variable", builtin_read},
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{"return", "Return from a function", builtin_not_written},
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{"set", "Set/unset shell options", builtin_not_written},
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{"shift", "Shift positional parameters", builtin_shift},
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{"ulimit","Controls resource limits", builtin_ulimit},
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{"trap", "Trap signals", builtin_not_written},
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{"ulimit","Controls resource limits", builtin_not_written},
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{"umask","Sets file creation mask", builtin_umask},
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{"unset", "Unset environment variable", builtin_unset},
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{".", "Source-in and run commands in a file", builtin_source},
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@ -640,16 +648,21 @@ static int builtin_source(struct child_prog *child)
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return (status);
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}
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static int builtin_ulimit(struct child_prog *child)
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{
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printf("builtin_ulimit not written\n");
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return EXIT_FAILURE;
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}
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static int builtin_umask(struct child_prog *child)
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{
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printf("builtin_umask not written\n");
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return EXIT_FAILURE;
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mode_t new_umask;
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const char *arg = child->argv[1];
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char *end;
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if (arg) {
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new_umask=strtoul(arg, &end, 8);
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if (*end!='\0' || end == arg) {
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return EXIT_FAILURE;
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}
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} else {
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printf("%.3o\n", (unsigned int) (new_umask=umask(0)));
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}
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umask(new_umask);
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return EXIT_SUCCESS;
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}
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/* built-in 'unset VAR' handler */
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@ -663,6 +676,12 @@ static int builtin_unset(struct child_prog *child)
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return EXIT_SUCCESS;
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}
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static int builtin_not_written(struct child_prog *child)
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{
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printf("builtin_%s not written\n",child->argv[0]);
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return EXIT_FAILURE;
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}
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static int b_check_space(o_string *o, int len)
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{
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/* It would be easy to drop a more restrictive policy
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@ -926,8 +945,12 @@ static int setup_redirects(struct child_prog *prog, int squirrel[])
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if (squirrel && redir->fd < 3) {
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squirrel[redir->fd] = dup(redir->fd);
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}
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dup2(openfd, redir->fd);
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close(openfd);
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if (openfd == -3) {
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close(openfd);
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} else {
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dup2(openfd, redir->fd);
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close(openfd);
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}
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}
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}
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return 0;
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@ -1216,6 +1239,11 @@ static int run_pipe_real(struct pipe *pi)
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if (strcmp(child->argv[0], x->cmd) == 0 ) {
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int squirrel[] = {-1, -1, -1};
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int rcode;
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if (x->function == builtin_exec && child->argv[1]==NULL) {
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debug_printf("magic exec\n");
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setup_redirects(child,NULL);
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return EXIT_SUCCESS;
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}
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debug_printf("builtin inline %s\n", child->argv[0]);
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/* XXX setup_redirects acts on file descriptors, not FILEs.
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* This is perfect for work that comes after exec().
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@ -1569,7 +1597,8 @@ static int setup_redirect(struct p_context *ctx, int fd, redir_type style,
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if (redir->dup == -2) return 1; /* syntax error */
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if (redir->dup != -1) {
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/* Erik had a check here that the file descriptor in question
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* is legit; I postpone that to "run time" */
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* is legit; I postpone that to "run time"
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* A "-" representation of "close me" shows up as a -3 here */
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debug_printf("Duplicating redirect '%d>&%d'\n", redir->fd, redir->dup);
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} else {
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/* We do _not_ try to open the file that src points to,
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@ -1775,10 +1804,16 @@ static int redirect_dup_num(struct in_str *input)
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if (ch != '&') return -1;
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b_getch(input); /* get the & */
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while (ch=b_peek(input),isdigit(ch)) {
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ch=b_peek(input);
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if (ch == '-') {
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b_getch(input);
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return -3; /* "-" represents "close me" */
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}
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while (isdigit(ch)) {
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d = d*10+(ch-'0');
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ok=1;
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b_getch(input);
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ch = b_peek(input);
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}
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if (ok) return d;
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73
shell/hush.c
73
shell/hush.c
@ -45,24 +45,25 @@
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* fancy forms of Parameter Expansion
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* Arithmetic Expansion
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* <(list) and >(list) Process Substitution
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* reserved words: case, esac, function
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* reserved words: case, esac, select, function
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* Here Documents ( << word )
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* Functions
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* Major bugs:
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* job handling woefully incomplete and buggy
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* reserved word execution woefully incomplete and buggy
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* to-do:
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* port selected bugfixes from post-0.49 busybox lash
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* finish implementing reserved words
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* port selected bugfixes from post-0.49 busybox lash - done?
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* finish implementing reserved words: for, while, until, do, done
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* change { and } from special chars to reserved words
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* builtins: break, continue, eval, return, set, trap, ulimit
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* test magic exec
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* handle children going into background
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* clean up recognition of null pipes
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* have builtin_exec set flag to avoid restore_redirects
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* figure out if "echo foo}" is fixable
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* check setting of global_argc and global_argv
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* control-C handling, probably with longjmp
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* VAR=value prefix for simple commands
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* follow IFS rules more precisely, including update semantics
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* write builtin_eval, builtin_ulimit, builtin_umask
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* figure out what to do with backslash-newline
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* explain why we use signal instead of sigaction
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* propagate syntax errors, die on resource errors?
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@ -97,6 +98,7 @@
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#include <fcntl.h>
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#include <getopt.h> /* should be pretty obvious */
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#include <sys/stat.h> /* ulimit */
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <signal.h>
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@ -323,9 +325,9 @@ static int builtin_pwd(struct child_prog *child);
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static int builtin_read(struct child_prog *child);
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static int builtin_shift(struct child_prog *child);
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static int builtin_source(struct child_prog *child);
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static int builtin_ulimit(struct child_prog *child);
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static int builtin_umask(struct child_prog *child);
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static int builtin_unset(struct child_prog *child);
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static int builtin_not_written(struct child_prog *child);
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/* o_string manipulation: */
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static int b_check_space(o_string *o, int len);
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static int b_addchr(o_string *o, int ch);
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@ -390,8 +392,11 @@ static void free_pipe(struct pipe *pi);
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* still be set at the end. */
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static struct built_in_command bltins[] = {
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{"bg", "Resume a job in the background", builtin_fg_bg},
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{"break", "Exit for, while or until loop", builtin_not_written},
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{"cd", "Change working directory", builtin_cd},
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{"continue", "Continue for, while or until loop", builtin_not_written},
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{"env", "Print all environment variables", builtin_env},
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{"eval", "Construct and run shell command", builtin_not_written},
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{"exec", "Exec command, replacing this shell with the exec'd process", builtin_exec},
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{"exit", "Exit from shell()", builtin_exit},
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{"export", "Set environment variable", builtin_export},
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@ -399,8 +404,11 @@ static struct built_in_command bltins[] = {
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{"jobs", "Lists the active jobs", builtin_jobs},
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{"pwd", "Print current directory", builtin_pwd},
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{"read", "Input environment variable", builtin_read},
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{"return", "Return from a function", builtin_not_written},
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{"set", "Set/unset shell options", builtin_not_written},
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{"shift", "Shift positional parameters", builtin_shift},
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{"ulimit","Controls resource limits", builtin_ulimit},
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{"trap", "Trap signals", builtin_not_written},
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{"ulimit","Controls resource limits", builtin_not_written},
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{"umask","Sets file creation mask", builtin_umask},
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{"unset", "Unset environment variable", builtin_unset},
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{".", "Source-in and run commands in a file", builtin_source},
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@ -640,16 +648,21 @@ static int builtin_source(struct child_prog *child)
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return (status);
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}
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static int builtin_ulimit(struct child_prog *child)
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{
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printf("builtin_ulimit not written\n");
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return EXIT_FAILURE;
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}
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static int builtin_umask(struct child_prog *child)
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{
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printf("builtin_umask not written\n");
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return EXIT_FAILURE;
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mode_t new_umask;
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const char *arg = child->argv[1];
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char *end;
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if (arg) {
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new_umask=strtoul(arg, &end, 8);
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if (*end!='\0' || end == arg) {
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return EXIT_FAILURE;
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}
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} else {
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printf("%.3o\n", (unsigned int) (new_umask=umask(0)));
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}
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umask(new_umask);
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return EXIT_SUCCESS;
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}
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/* built-in 'unset VAR' handler */
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@ -663,6 +676,12 @@ static int builtin_unset(struct child_prog *child)
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return EXIT_SUCCESS;
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}
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static int builtin_not_written(struct child_prog *child)
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{
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printf("builtin_%s not written\n",child->argv[0]);
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return EXIT_FAILURE;
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}
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static int b_check_space(o_string *o, int len)
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{
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/* It would be easy to drop a more restrictive policy
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@ -926,8 +945,12 @@ static int setup_redirects(struct child_prog *prog, int squirrel[])
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if (squirrel && redir->fd < 3) {
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squirrel[redir->fd] = dup(redir->fd);
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}
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dup2(openfd, redir->fd);
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close(openfd);
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if (openfd == -3) {
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close(openfd);
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} else {
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dup2(openfd, redir->fd);
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close(openfd);
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}
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}
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}
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return 0;
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@ -1216,6 +1239,11 @@ static int run_pipe_real(struct pipe *pi)
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if (strcmp(child->argv[0], x->cmd) == 0 ) {
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int squirrel[] = {-1, -1, -1};
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int rcode;
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if (x->function == builtin_exec && child->argv[1]==NULL) {
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debug_printf("magic exec\n");
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setup_redirects(child,NULL);
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return EXIT_SUCCESS;
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}
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debug_printf("builtin inline %s\n", child->argv[0]);
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/* XXX setup_redirects acts on file descriptors, not FILEs.
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* This is perfect for work that comes after exec().
|
||||
@ -1569,7 +1597,8 @@ static int setup_redirect(struct p_context *ctx, int fd, redir_type style,
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if (redir->dup == -2) return 1; /* syntax error */
|
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if (redir->dup != -1) {
|
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/* Erik had a check here that the file descriptor in question
|
||||
* is legit; I postpone that to "run time" */
|
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* is legit; I postpone that to "run time"
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* A "-" representation of "close me" shows up as a -3 here */
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debug_printf("Duplicating redirect '%d>&%d'\n", redir->fd, redir->dup);
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} else {
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/* We do _not_ try to open the file that src points to,
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@ -1775,10 +1804,16 @@ static int redirect_dup_num(struct in_str *input)
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if (ch != '&') return -1;
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b_getch(input); /* get the & */
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while (ch=b_peek(input),isdigit(ch)) {
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ch=b_peek(input);
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if (ch == '-') {
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b_getch(input);
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return -3; /* "-" represents "close me" */
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}
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while (isdigit(ch)) {
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d = d*10+(ch-'0');
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ok=1;
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b_getch(input);
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ch = b_peek(input);
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}
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if (ok) return d;
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