aboutsummaryrefslogtreecommitdiff
path: root/shell
diff options
context:
space:
mode:
Diffstat (limited to 'shell')
-rw-r--r--shell/lash.c107
1 files changed, 67 insertions, 40 deletions
diff --git a/shell/lash.c b/shell/lash.c
index 1fcd63bdf..3675d21df 100644
--- a/shell/lash.c
+++ b/shell/lash.c
@@ -56,14 +56,18 @@
#include <glob.h>
#define expand_t glob_t
+/* Always enable for the moment... */
+#define CONFIG_LASH_PIPE_N_REDIRECTS
static const int MAX_READ = 128; /* size of input buffer for `read' builtin */
#define JOB_STATUS_FORMAT "[%d] %-22s %.40s\n"
+#ifdef CONFIG_LASH_PIPE_N_REDIRECTS
enum redir_type { REDIRECT_INPUT, REDIRECT_OVERWRITE,
REDIRECT_APPEND
};
+#endif
static const unsigned int DEFAULT_CONTEXT=0x1;
static const unsigned int IF_TRUE_CONTEXT=0x2;
@@ -71,25 +75,28 @@ static const unsigned int IF_FALSE_CONTEXT=0x4;
static const unsigned int THEN_EXP_CONTEXT=0x8;
static const unsigned int ELSE_EXP_CONTEXT=0x10;
-
-struct jobset {
- struct job *head; /* head of list of running jobs */
- struct job *fg; /* current foreground job */
-};
-
+#ifdef CONFIG_LASH_PIPE_N_REDIRECTS
struct redir_struct {
enum redir_type type; /* type of redirection */
int fd; /* file descriptor being redirected */
char *filename; /* file to redirect fd to */
};
+#endif
struct child_prog {
pid_t pid; /* 0 if exited */
char **argv; /* program name and arguments */
int num_redirects; /* elements in redirection array */
- struct redir_struct *redirects; /* I/O redirects */
int is_stopped; /* is the program currently running? */
struct job *family; /* pointer back to the child's parent job */
+#ifdef CONFIG_LASH_PIPE_N_REDIRECTS
+ struct redir_struct *redirects; /* I/O redirects */
+#endif
+};
+
+struct jobset {
+ struct job *head; /* head of list of running jobs */
+ struct job *fg; /* current foreground job */
};
struct job {
@@ -514,8 +521,10 @@ static void free_job(struct job *cmd)
for (i = 0; i < cmd->num_progs; i++) {
free(cmd->progs[i].argv);
+#ifdef CONFIG_LASH_PIPE_N_REDIRECTS
if (cmd->progs[i].redirects)
free(cmd->progs[i].redirects);
+#endif
}
free(cmd->progs);
free(cmd->text);
@@ -548,7 +557,7 @@ static void remove_job(struct jobset *j_list, struct job *job)
free(job);
}
-/* Checks to see if any background processes have exited -- if they
+/* Checks to see if any background processes have exited -- if they
have, figure out why and see if a job has completed */
static void checkjobs(struct jobset *j_list)
{
@@ -593,7 +602,7 @@ static void checkjobs(struct jobset *j_list)
printf(JOB_STATUS_FORMAT, job->jobid, "Stopped",
job->text);
}
-#endif
+#endif
}
}
@@ -601,6 +610,7 @@ static void checkjobs(struct jobset *j_list)
bb_perror_msg("waitpid");
}
+#ifdef CONFIG_LASH_PIPE_N_REDIRECTS
/* 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[])
@@ -656,6 +666,15 @@ static void restore_redirects(int squirrel[])
}
}
}
+#else
+static inline int setup_redirects(struct child_prog *prog, int squirrel[])
+{
+ return 0;
+}
+static inline void restore_redirects(int squirrel[])
+{
+}
+#endif
static inline void cmdedit_set_initial_prompt(void)
{
@@ -665,7 +684,7 @@ static inline void cmdedit_set_initial_prompt(void)
PS1 = getenv("PS1");
if(PS1==0)
PS1 = "\\w \\$ ";
-#endif
+#endif
}
static inline void setup_prompt_string(char **prompt_str)
@@ -682,7 +701,7 @@ static inline void setup_prompt_string(char **prompt_str)
}
#else
*prompt_str = (shell_context==0)? PS1 : PS2;
-#endif
+#endif
}
static int get_command(FILE * source, char *command)
@@ -761,7 +780,7 @@ char * strsep_space( char *string, int * ix)
(*ix)++;
}
- /* Find the end of any whitespace trailing behind
+ /* Find the end of any whitespace trailing behind
* the token and let that be part of the token */
while( string && string[*ix] && isspace(string[*ix]) ) {
(*ix)++;
@@ -774,7 +793,7 @@ char * strsep_space( char *string, int * ix)
token = xmalloc(*ix+1);
token[*ix] = '\0';
- strncpy(token, string, *ix);
+ strncpy(token, string, *ix);
return token;
}
@@ -789,10 +808,10 @@ static int expand_arguments(char *command)
int flags = GLOB_NOCHECK
#ifdef GLOB_BRACE
| GLOB_BRACE
-#endif
+#endif
#ifdef GLOB_TILDE
| GLOB_TILDE
-#endif
+#endif
;
/* get rid of the terminating \n */
@@ -817,7 +836,7 @@ static int expand_arguments(char *command)
* we write stuff into the original (in a minute) */
cmd = cmd_copy = bb_xstrdup(command);
*command = '\0';
- for (ix = 0, tmpcmd = cmd;
+ for (ix = 0, tmpcmd = cmd;
(tmpcmd = strsep_space(cmd, &ix)) != NULL; cmd += ix, ix=0) {
if (*tmpcmd == '\0')
break;
@@ -832,7 +851,7 @@ static int expand_arguments(char *command)
return FALSE;
} else if (retval != 0) {
/* Some other error. GLOB_NOMATCH shouldn't
- * happen because of the GLOB_NOCHECK flag in
+ * happen because of the GLOB_NOCHECK flag in
* the glob call. */
bb_error_msg("syntax error");
return FALSE;
@@ -856,7 +875,7 @@ static int expand_arguments(char *command)
free(cmd_copy);
trim(command);
- /* Now do the shell variable substitutions which
+ /* Now do the shell variable substitutions which
* wordexp can't do for us, namely $? and $! */
src = command;
while((dst = strchr(src,'$')) != NULL){
@@ -946,21 +965,25 @@ static int expand_arguments(char *command)
/* Return cmd->num_progs as 0 if no command is present (e.g. an empty
line). If a valid command is found, command_ptr is set to point to
- the beginning of the next command (if the original command had more
- then one job associated with it) or NULL if no more commands are
+ the beginning of the next command (if the original command had more
+ then one job associated with it) or NULL if no more commands are
present. */
static int parse_command(char **command_ptr, struct job *job, int *inbg)
{
char *command;
char *return_command = NULL;
- char *src, *buf, *chptr;
+ char *src, *buf;
int argc_l = 0;
int done = 0;
int argv_alloced;
- int i, saw_quote = 0;
+ int saw_quote = 0;
char quote = '\0';
int count;
struct child_prog *prog;
+#ifdef CONFIG_LASH_PIPE_N_REDIRECTS
+ int i;
+ char *chptr;
+#endif
/* skip leading white space */
while (**command_ptr && isspace(**command_ptr))
@@ -976,21 +999,23 @@ static int parse_command(char **command_ptr, struct job *job, int *inbg)
job->num_progs = 1;
job->progs = xmalloc(sizeof(*job->progs));
- /* We set the argv elements to point inside of this string. The
+ /* We set the argv elements to point inside of this string. The
memory is freed by free_job(). Allocate twice the original
length in case we need to quote every single character.
- Getting clean memory relieves us of the task of NULL
- terminating things and makes the rest of this look a bit
+ Getting clean memory relieves us of the task of NULL
+ terminating things and makes the rest of this look a bit
cleaner (though it is, admittedly, a tad less efficient) */
job->cmdbuf = command = xcalloc(2*strlen(*command_ptr) + 1, sizeof(char));
job->text = NULL;
prog = job->progs;
prog->num_redirects = 0;
- prog->redirects = NULL;
prog->is_stopped = 0;
prog->family = job;
+#ifdef CONFIG_LASH_PIPE_N_REDIRECTS
+ prog->redirects = NULL;
+#endif
argv_alloced = 5;
prog->argv = xmalloc(sizeof(*prog->argv) * argv_alloced);
@@ -1046,6 +1071,7 @@ static int parse_command(char **command_ptr, struct job *job, int *inbg)
done = 1;
break;
+#ifdef CONFIG_LASH_PIPE_N_REDIRECTS
case '>': /* redirects */
case '<':
i = prog->num_redirects++;
@@ -1143,6 +1169,7 @@ static int parse_command(char **command_ptr, struct job *job, int *inbg)
src--; /* we'll ++ it at the end of the loop */
break;
+#endif
case '&': /* background */
*inbg = 1;
@@ -1189,7 +1216,7 @@ static int parse_command(char **command_ptr, struct job *job, int *inbg)
}
*command_ptr = return_command;
-
+
return 0;
}
@@ -1236,7 +1263,7 @@ static int pseudo_exec(struct child_prog *child)
#ifdef CONFIG_FEATURE_SH_APPLETS_ALWAYS_WIN
/* If you enable CONFIG_FEATURE_SH_APPLETS_ALWAYS_WIN, then
- * if you run /bin/cat, it will use BusyBox cat even if
+ * if you run /bin/cat, it will use BusyBox cat even if
* /bin/cat exists on the filesystem and is _not_ busybox.
* Some systems want this, others do not. Choose wisely. :-)
*/
@@ -1254,7 +1281,7 @@ static int pseudo_exec(struct child_prog *child)
execvp(child->argv[0], child->argv);
- /* Do not use bb_perror_msg_and_die() here, since we must not
+ /* Do not use bb_perror_msg_and_die() here, since we must not
* call exit() but should call _exit() instead */
fprintf(stderr, "%s: %m\n", child->argv[0]);
_exit(EXIT_FAILURE);
@@ -1286,7 +1313,7 @@ static void insert_job(struct job *newjob, int inbg)
thejob->stopped_progs = 0;
if (inbg) {
- /* we don't wait for background thejobs to return -- append it
+ /* we don't wait for background thejobs to return -- append it
to the list of backgrounded thejobs and leave it alone */
printf("[%d] %d\n", thejob->jobid,
newjob->progs[newjob->num_progs - 1].pid);
@@ -1336,8 +1363,8 @@ static int run_command(struct job *newjob, int inbg, int outpipe[2])
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;
+ int squirrel[] = {-1, -1, -1};
setup_redirects(child, squirrel);
rcode = x->function(child);
restore_redirects(squirrel);
@@ -1347,9 +1374,9 @@ static int run_command(struct job *newjob, int inbg, int outpipe[2])
}
#if !defined(__UCLIBC__) || defined(__UCLIBC_HAS_MMU__)
- if (!(child->pid = fork()))
+ if (!(child->pid = fork()))
#else
- if (!(child->pid = vfork()))
+ if (!(child->pid = vfork()))
#endif
{
/* Set the handling for job control signals back to the default. */
@@ -1394,7 +1421,7 @@ static int run_command(struct job *newjob, int inbg, int outpipe[2])
if (nextout != 1)
close(nextout);
- /* If there isn't another process, nextin is garbage
+ /* If there isn't another process, nextin is garbage
but it doesn't matter */
nextin = pipefds[0];
}
@@ -1446,7 +1473,7 @@ static int busy_loop(FILE * input)
if (!parse_command(&next_command, &newjob, &inbg) &&
newjob.num_progs) {
int pipefds[2] = {-1,-1};
- debug_printf( "job=%p fed to run_command by busy_loop()'\n",
+ debug_printf( "job=%p fed to run_command by busy_loop()'\n",
&newjob);
run_command(&newjob, inbg, pipefds);
}
@@ -1495,7 +1522,7 @@ static int busy_loop(FILE * input)
/* move the shell to the foreground */
/* suppress messages when run from /linuxrc mag@sysgo.de */
if (tcsetpgrp(shell_terminal, getpgrp()) && errno != ENOTTY)
- bb_perror_msg("tcsetpgrp");
+ bb_perror_msg("tcsetpgrp");
}
}
}
@@ -1508,7 +1535,7 @@ static int busy_loop(FILE * input)
/* return exit status if called with "-c" */
if (input == NULL && WIFEXITED(status))
return WEXITSTATUS(status);
-
+
return 0;
}
@@ -1534,7 +1561,7 @@ void free_memory(void)
static void setup_job_control(void)
{
int status;
-
+
/* Loop until we are in the foreground. */
while ((status = tcgetpgrp (shell_terminal)) >= 0) {
if (status == (shell_pgrp = getpgrp ())) {
@@ -1580,7 +1607,7 @@ int lash_main(int argc_l, char **argv_l)
prof_input = fopen("/etc/profile", "r");
if (prof_input) {
int tmp_fd = fileno(prof_input);
- mark_open(tmp_fd);
+ mark_open(tmp_fd);
/* Now run the file */
busy_loop(prof_input);
fclose(prof_input);
@@ -1644,6 +1671,6 @@ int lash_main(int argc_l, char **argv_l)
#else
PS1 = NULL;
#endif
-
+
return (busy_loop(input));
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-12 15:57:43 +0000