*/
//
-//This works pretty well now, and is not on by default.
+//This works pretty well now, and is now on by default.
#define BB_FEATURE_SH_ENVIRONMENT
//
//Backtick support has some problems, use at your own risk!
//
//If, then, else, etc. support.. This should now behave basically
//like any other Bourne shell...
-//#define BB_FEATURE_SH_IF_EXPRESSIONS
+#define BB_FEATURE_SH_IF_EXPRESSIONS
//
/* This is currently a little broken... */
//#define HANDLE_CONTINUATION_CHARS
int i, jobNum;
struct job *job=NULL;
+ if (!child->argv[1] || child->argv[2]) {
+ error_msg("%s: exactly one argument is expected\n",
+ child->argv[0]);
+ return EXIT_FAILURE;
+ }
- if (!child->argv[1] || child->argv[2]) {
- error_msg("%s: exactly one argument is expected\n",
- child->argv[0]);
- return EXIT_FAILURE;
- }
- if (sscanf(child->argv[1], "%%%d", &jobNum) != 1) {
- error_msg("%s: bad argument '%s'\n",
- child->argv[0], child->argv[1]);
- return EXIT_FAILURE;
- }
- for (job = child->family->job_list->head; job; job = job->next) {
- if (job->jobid == jobNum) {
- break;
- }
+ if (sscanf(child->argv[1], "%%%d", &jobNum) != 1) {
+ error_msg("%s: bad argument '%s'\n",
+ child->argv[0], child->argv[1]);
+ return EXIT_FAILURE;
+ }
+
+ for (job = child->family->job_list->head; job; job = job->next) {
+ if (job->jobid == jobNum) {
+ break;
}
+ }
if (!job) {
error_msg("%s: unknown job %d\n",
}
cmd->job_context |= ELSE_EXP_CONTEXT;
- debug_printf("job=%p builtin_else set job context to %x\n", child->family, cmd->job_context);
+ debug_printf("job=%p builtin_else set job context to %x\n", cmd, cmd->job_context);
/* Now run the 'else' command */
debug_printf( "'else' now running '%s'\n", charptr1);
#ifdef BB_FEATURE_SH_IF_EXPRESSIONS
/* currently used by if/then/else.
- * Needlessly (?) forks and reparses the command line.
- * But pseudo_exec on the pre-parsed args doesn't have the
- * "fork, stick around until the child exits, and find it's return code"
- * functionality. The fork is not needed if the predicate is
- * non-forking builtin, and maybe not even if it's a forking builtin.
- * applets pretty clearly need the fork.
+ *
+ * Reparsing the command line for this purpose is gross,
+ * incorrect, and fundamentally unfixable; in particular,
+ * think about what happens with command substitution.
+ * We really need to pull out the run, wait, return status
+ * functionality out of busy_loop so we can child->argv++
+ * and use that, without going back through parse_command.
*/
static int run_command_predicate(char *cmd)
{
perror("waitpid");
}
-static int setup_redirects(struct child_prog *prog)
+/* squirrel != NULL means we squirrel away copies of stdin, stdout,
+ * and stderr if they are redirected. */
+static int setup_redirects(struct child_prog *prog, int squirrel[])
{
int i;
int openfd;
}
if (openfd != redir->fd) {
+ if (squirrel && redir->fd < 3) {
+ squirrel[redir->fd] = dup(redir->fd);
+ }
dup2(openfd, redir->fd);
close(openfd);
}
return 0;
}
+static void restore_redirects(int squirrel[])
+{
+ int i, fd;
+ for (i=0; i<3; i++) {
+ fd = squirrel[i];
+ if (fd != -1) {
+ /* No error checking. I sure wouldn't know what
+ * to do with an error if I found one! */
+ dup2(fd, i);
+ close(fd);
+ }
+ }
+}
static int get_command(FILE * source, char *command)
{
struct BB_applet search_applet, *applet;
#endif
- /* Check if the command matches any of the forking builtins.
- * XXX It would probably be wise to check for non-forking builtins
- * here as well, since in some context the non-forking path
- * is disabled or bypassed. See comment in run_command.
+ /* Check if the command matches any of the non-forking 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.
*/
+ for (x = bltins; x->cmd; x++) {
+ if (strcmp(child->argv[0], x->cmd) == 0 ) {
+ exit(x->function(child));
+ }
+ }
+
+ /* Check if the command matches any of the forking builtins. */
for (x = bltins_forking; x->cmd; x++) {
if (strcmp(child->argv[0], x->cmd) == 0) {
applet_name=x->cmd;
}
#endif
- /* Check if the command matches any non-forking builtins.
- * XXX should probably skip this test, and fork anyway, if
- * there redirects of some kind demand forking to work right.
- * pseudo_exec would then need to handle the non-forking command
- * in a forked context.
+ /* Check if the command matches any non-forking builtins,
+ * but only if this is a simple command.
+ * Non-forking builtins within pipes have to fork anyway,
+ * and are handled in pseudo_exec. "echo foo | read bar"
+ * is doomed to failure, and doesn't work on bash, either.
*/
- for (x = bltins; x->cmd; x++) {
- if (strcmp(child->argv[0], x->cmd) == 0 ) {
- return(x->function(child));
+ if (newjob->num_progs == 1) {
+ for (x = bltins; x->cmd; x++) {
+ if (strcmp(child->argv[0], x->cmd) == 0 ) {
+ int squirrel[] = {-1, -1, -1};
+ int rcode;
+ setup_redirects(child, squirrel);
+ rcode = x->function(child);
+ restore_redirects(squirrel);
+ return rcode;
+ }
}
}
}
/* explicit redirects override pipes */
- setup_redirects(child);
+ setup_redirects(child,NULL);
pseudo_exec(child);
}
*/
//
-//This works pretty well now, and is not on by default.
+//This works pretty well now, and is now on by default.
#define BB_FEATURE_SH_ENVIRONMENT
//
//Backtick support has some problems, use at your own risk!
//
//If, then, else, etc. support.. This should now behave basically
//like any other Bourne shell...
-//#define BB_FEATURE_SH_IF_EXPRESSIONS
+#define BB_FEATURE_SH_IF_EXPRESSIONS
//
/* This is currently a little broken... */
//#define HANDLE_CONTINUATION_CHARS
int i, jobNum;
struct job *job=NULL;
+ if (!child->argv[1] || child->argv[2]) {
+ error_msg("%s: exactly one argument is expected\n",
+ child->argv[0]);
+ return EXIT_FAILURE;
+ }
- if (!child->argv[1] || child->argv[2]) {
- error_msg("%s: exactly one argument is expected\n",
- child->argv[0]);
- return EXIT_FAILURE;
- }
- if (sscanf(child->argv[1], "%%%d", &jobNum) != 1) {
- error_msg("%s: bad argument '%s'\n",
- child->argv[0], child->argv[1]);
- return EXIT_FAILURE;
- }
- for (job = child->family->job_list->head; job; job = job->next) {
- if (job->jobid == jobNum) {
- break;
- }
+ if (sscanf(child->argv[1], "%%%d", &jobNum) != 1) {
+ error_msg("%s: bad argument '%s'\n",
+ child->argv[0], child->argv[1]);
+ return EXIT_FAILURE;
+ }
+
+ for (job = child->family->job_list->head; job; job = job->next) {
+ if (job->jobid == jobNum) {
+ break;
}
+ }
if (!job) {
error_msg("%s: unknown job %d\n",
}
cmd->job_context |= ELSE_EXP_CONTEXT;
- debug_printf("job=%p builtin_else set job context to %x\n", child->family, cmd->job_context);
+ debug_printf("job=%p builtin_else set job context to %x\n", cmd, cmd->job_context);
/* Now run the 'else' command */
debug_printf( "'else' now running '%s'\n", charptr1);
#ifdef BB_FEATURE_SH_IF_EXPRESSIONS
/* currently used by if/then/else.
- * Needlessly (?) forks and reparses the command line.
- * But pseudo_exec on the pre-parsed args doesn't have the
- * "fork, stick around until the child exits, and find it's return code"
- * functionality. The fork is not needed if the predicate is
- * non-forking builtin, and maybe not even if it's a forking builtin.
- * applets pretty clearly need the fork.
+ *
+ * Reparsing the command line for this purpose is gross,
+ * incorrect, and fundamentally unfixable; in particular,
+ * think about what happens with command substitution.
+ * We really need to pull out the run, wait, return status
+ * functionality out of busy_loop so we can child->argv++
+ * and use that, without going back through parse_command.
*/
static int run_command_predicate(char *cmd)
{
perror("waitpid");
}
-static int setup_redirects(struct child_prog *prog)
+/* squirrel != NULL means we squirrel away copies of stdin, stdout,
+ * and stderr if they are redirected. */
+static int setup_redirects(struct child_prog *prog, int squirrel[])
{
int i;
int openfd;
}
if (openfd != redir->fd) {
+ if (squirrel && redir->fd < 3) {
+ squirrel[redir->fd] = dup(redir->fd);
+ }
dup2(openfd, redir->fd);
close(openfd);
}
return 0;
}
+static void restore_redirects(int squirrel[])
+{
+ int i, fd;
+ for (i=0; i<3; i++) {
+ fd = squirrel[i];
+ if (fd != -1) {
+ /* No error checking. I sure wouldn't know what
+ * to do with an error if I found one! */
+ dup2(fd, i);
+ close(fd);
+ }
+ }
+}
static int get_command(FILE * source, char *command)
{
struct BB_applet search_applet, *applet;
#endif
- /* Check if the command matches any of the forking builtins.
- * XXX It would probably be wise to check for non-forking builtins
- * here as well, since in some context the non-forking path
- * is disabled or bypassed. See comment in run_command.
+ /* Check if the command matches any of the non-forking 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.
*/
+ for (x = bltins; x->cmd; x++) {
+ if (strcmp(child->argv[0], x->cmd) == 0 ) {
+ exit(x->function(child));
+ }
+ }
+
+ /* Check if the command matches any of the forking builtins. */
for (x = bltins_forking; x->cmd; x++) {
if (strcmp(child->argv[0], x->cmd) == 0) {
applet_name=x->cmd;
}
#endif
- /* Check if the command matches any non-forking builtins.
- * XXX should probably skip this test, and fork anyway, if
- * there redirects of some kind demand forking to work right.
- * pseudo_exec would then need to handle the non-forking command
- * in a forked context.
+ /* Check if the command matches any non-forking builtins,
+ * but only if this is a simple command.
+ * Non-forking builtins within pipes have to fork anyway,
+ * and are handled in pseudo_exec. "echo foo | read bar"
+ * is doomed to failure, and doesn't work on bash, either.
*/
- for (x = bltins; x->cmd; x++) {
- if (strcmp(child->argv[0], x->cmd) == 0 ) {
- return(x->function(child));
+ if (newjob->num_progs == 1) {
+ for (x = bltins; x->cmd; x++) {
+ if (strcmp(child->argv[0], x->cmd) == 0 ) {
+ int squirrel[] = {-1, -1, -1};
+ int rcode;
+ setup_redirects(child, squirrel);
+ rcode = x->function(child);
+ restore_redirects(squirrel);
+ return rcode;
+ }
}
}
}
/* explicit redirects override pipes */
- setup_redirects(child);
+ setup_redirects(child,NULL);
pseudo_exec(child);
}
*/
//
-//This works pretty well now, and is not on by default.
+//This works pretty well now, and is now on by default.
#define BB_FEATURE_SH_ENVIRONMENT
//
//Backtick support has some problems, use at your own risk!
//
//If, then, else, etc. support.. This should now behave basically
//like any other Bourne shell...
-//#define BB_FEATURE_SH_IF_EXPRESSIONS
+#define BB_FEATURE_SH_IF_EXPRESSIONS
//
/* This is currently a little broken... */
//#define HANDLE_CONTINUATION_CHARS
int i, jobNum;
struct job *job=NULL;
+ if (!child->argv[1] || child->argv[2]) {
+ error_msg("%s: exactly one argument is expected\n",
+ child->argv[0]);
+ return EXIT_FAILURE;
+ }
- if (!child->argv[1] || child->argv[2]) {
- error_msg("%s: exactly one argument is expected\n",
- child->argv[0]);
- return EXIT_FAILURE;
- }
- if (sscanf(child->argv[1], "%%%d", &jobNum) != 1) {
- error_msg("%s: bad argument '%s'\n",
- child->argv[0], child->argv[1]);
- return EXIT_FAILURE;
- }
- for (job = child->family->job_list->head; job; job = job->next) {
- if (job->jobid == jobNum) {
- break;
- }
+ if (sscanf(child->argv[1], "%%%d", &jobNum) != 1) {
+ error_msg("%s: bad argument '%s'\n",
+ child->argv[0], child->argv[1]);
+ return EXIT_FAILURE;
+ }
+
+ for (job = child->family->job_list->head; job; job = job->next) {
+ if (job->jobid == jobNum) {
+ break;
}
+ }
if (!job) {
error_msg("%s: unknown job %d\n",
}
cmd->job_context |= ELSE_EXP_CONTEXT;
- debug_printf("job=%p builtin_else set job context to %x\n", child->family, cmd->job_context);
+ debug_printf("job=%p builtin_else set job context to %x\n", cmd, cmd->job_context);
/* Now run the 'else' command */
debug_printf( "'else' now running '%s'\n", charptr1);
#ifdef BB_FEATURE_SH_IF_EXPRESSIONS
/* currently used by if/then/else.
- * Needlessly (?) forks and reparses the command line.
- * But pseudo_exec on the pre-parsed args doesn't have the
- * "fork, stick around until the child exits, and find it's return code"
- * functionality. The fork is not needed if the predicate is
- * non-forking builtin, and maybe not even if it's a forking builtin.
- * applets pretty clearly need the fork.
+ *
+ * Reparsing the command line for this purpose is gross,
+ * incorrect, and fundamentally unfixable; in particular,
+ * think about what happens with command substitution.
+ * We really need to pull out the run, wait, return status
+ * functionality out of busy_loop so we can child->argv++
+ * and use that, without going back through parse_command.
*/
static int run_command_predicate(char *cmd)
{
perror("waitpid");
}
-static int setup_redirects(struct child_prog *prog)
+/* squirrel != NULL means we squirrel away copies of stdin, stdout,
+ * and stderr if they are redirected. */
+static int setup_redirects(struct child_prog *prog, int squirrel[])
{
int i;
int openfd;
}
if (openfd != redir->fd) {
+ if (squirrel && redir->fd < 3) {
+ squirrel[redir->fd] = dup(redir->fd);
+ }
dup2(openfd, redir->fd);
close(openfd);
}
return 0;
}
+static void restore_redirects(int squirrel[])
+{
+ int i, fd;
+ for (i=0; i<3; i++) {
+ fd = squirrel[i];
+ if (fd != -1) {
+ /* No error checking. I sure wouldn't know what
+ * to do with an error if I found one! */
+ dup2(fd, i);
+ close(fd);
+ }
+ }
+}
static int get_command(FILE * source, char *command)
{
struct BB_applet search_applet, *applet;
#endif
- /* Check if the command matches any of the forking builtins.
- * XXX It would probably be wise to check for non-forking builtins
- * here as well, since in some context the non-forking path
- * is disabled or bypassed. See comment in run_command.
+ /* Check if the command matches any of the non-forking 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.
*/
+ for (x = bltins; x->cmd; x++) {
+ if (strcmp(child->argv[0], x->cmd) == 0 ) {
+ exit(x->function(child));
+ }
+ }
+
+ /* Check if the command matches any of the forking builtins. */
for (x = bltins_forking; x->cmd; x++) {
if (strcmp(child->argv[0], x->cmd) == 0) {
applet_name=x->cmd;
}
#endif
- /* Check if the command matches any non-forking builtins.
- * XXX should probably skip this test, and fork anyway, if
- * there redirects of some kind demand forking to work right.
- * pseudo_exec would then need to handle the non-forking command
- * in a forked context.
+ /* Check if the command matches any non-forking builtins,
+ * but only if this is a simple command.
+ * Non-forking builtins within pipes have to fork anyway,
+ * and are handled in pseudo_exec. "echo foo | read bar"
+ * is doomed to failure, and doesn't work on bash, either.
*/
- for (x = bltins; x->cmd; x++) {
- if (strcmp(child->argv[0], x->cmd) == 0 ) {
- return(x->function(child));
+ if (newjob->num_progs == 1) {
+ for (x = bltins; x->cmd; x++) {
+ if (strcmp(child->argv[0], x->cmd) == 0 ) {
+ int squirrel[] = {-1, -1, -1};
+ int rcode;
+ setup_redirects(child, squirrel);
+ rcode = x->function(child);
+ restore_redirects(squirrel);
+ return rcode;
+ }
}
}
}
/* explicit redirects override pipes */
- setup_redirects(child);
+ setup_redirects(child,NULL);
pseudo_exec(child);
}
projects / oweals / busybox.git / commitdiff