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-rw-r--r--shell/cmdedit.c25
-rw-r--r--shell/cmdedit.h1
-rw-r--r--shell/lash.c179
3 files changed, 143 insertions, 62 deletions
diff --git a/shell/cmdedit.c b/shell/cmdedit.c
index 0ce64be..042064f 100644
--- a/shell/cmdedit.c
+++ b/shell/cmdedit.c
@@ -84,6 +84,7 @@ static int cmdedit_termw = 80; /* actual terminal width */
static int cmdedit_scroll = 27; /* width of EOL scrolling region */
static int history_counter = 0; /* Number of commands in history list */
static int reset_term = 0; /* Set to true if the terminal needs to be reset upon exit */
+static int exithandler_set = 0; /* Set to true when atexit() has been called */
struct history {
char *s;
@@ -709,10 +710,32 @@ extern void cmdedit_read_input(char* prompt, char command[BUFSIZ])
extern void cmdedit_init(void)
{
- atexit(cmdedit_reset_term);
+ if(exithandler_set == 0) {
+ atexit(cmdedit_reset_term); /* be sure to do this only once */
+ exithandler_set = 1;
+ }
signal(SIGKILL, clean_up_and_die);
signal(SIGINT, clean_up_and_die);
signal(SIGQUIT, clean_up_and_die);
signal(SIGTERM, clean_up_and_die);
}
+
+/*
+** Undo the effects of cmdedit_init() as good as we can:
+** I am not aware of a way to revoke an atexit() handler,
+** but, fortunately, our particular handler can be made
+** a no-op by setting reset_term = 0.
+*/
+extern void cmdedit_terminate(void)
+{
+ cmdedit_reset_term();
+ reset_term = 0;
+ signal(SIGKILL, SIG_DFL);
+ signal(SIGINT, SIG_DFL);
+ signal(SIGQUIT, SIG_DFL);
+ signal(SIGTERM, SIG_DFL);
+}
+
+
+
#endif /* BB_FEATURE_SH_COMMAND_EDITING */
diff --git a/shell/cmdedit.h b/shell/cmdedit.h
index b621ae8..27f7b55 100644
--- a/shell/cmdedit.h
+++ b/shell/cmdedit.h
@@ -11,6 +11,7 @@
typedef size_t (*cmdedit_strwidth_proc)(char *);
void cmdedit_init(void);
+void cmdedit_terminate(void);
void cmdedit_read_input(char* promptStr, char* command); /* read a line of input */
void cmdedit_setwidth(int); /* specify width of screen */
void cmdedit_histadd(char *); /* adds entries to hist */
diff --git a/shell/lash.c b/shell/lash.c
index e575676..836fc9b 100644
--- a/shell/lash.c
+++ b/shell/lash.c
@@ -29,6 +29,7 @@
//#define BB_FEATURE_SH_BACKTICKS
//#define BB_FEATURE_SH_IF_EXPRESSIONS
//#define BB_FEATURE_SH_ENVIRONMENT
+//#define DEBUG_SHELL
#include "internal.h"
@@ -43,6 +44,7 @@
#include <sys/ioctl.h>
#include <sys/wait.h>
#include <unistd.h>
+#include <getopt.h>
#ifdef BB_FEATURE_SH_COMMAND_EDITING
#include "cmdedit.h"
#endif
@@ -172,8 +174,9 @@ static char **argv;
#ifdef BB_FEATURE_SH_ENVIRONMENT
static int lastBgPid=-1;
static int lastReturnCode=-1;
+static int showXtrace=FALSE;
#endif
-
+
#ifdef BB_FEATURE_SH_COMMAND_EDITING
void win_changed(int junk)
@@ -382,14 +385,23 @@ static int builtin_if(struct job *cmd, struct jobSet *jobList)
status=strlen(charptr1);
local_pending_command = xmalloc(status+1);
strncpy(local_pending_command, charptr1, status);
- printf("'if' now running '%s'\n", charptr1);
+ local_pending_command[status]='\0';
+#ifdef DEBUG_SHELL
+ fprintf(stderr, "'if' now testing '%s'\n", local_pending_command);
+#endif
status = busy_loop(NULL); /* Frees local_pending_command */
- printf("if test returned ");
+#ifdef DEBUG_SHELL
+ fprintf(stderr, "if test returned ");
+#endif
if (status == 0) {
- printf("TRUE\n");
+#ifdef DEBUG_SHELL
+ fprintf(stderr, "TRUE\n");
+#endif
cmd->jobContext |= IF_TRUE_CONTEXT;
} else {
- printf("FALSE\n");
+#ifdef DEBUG_SHELL
+ fprintf(stderr, "FALSE\n");
+#endif
cmd->jobContext |= IF_FALSE_CONTEXT;
}
@@ -407,7 +419,7 @@ static int builtin_then(struct job *cmd, struct jobSet *junk)
return FALSE;
}
/* If the if result was FALSE, skip the 'then' stuff */
- if (cmd->jobContext & IF_TRUE_CONTEXT) {
+ if (cmd->jobContext & IF_FALSE_CONTEXT) {
return TRUE;
}
@@ -418,7 +430,10 @@ static int builtin_then(struct job *cmd, struct jobSet *junk)
status=strlen(charptr1);
local_pending_command = xmalloc(status+1);
strncpy(local_pending_command, charptr1, status);
- printf("'then' now running '%s'\n", charptr1);
+ local_pending_command[status]='\0';
+#ifdef DEBUG_SHELL
+ fprintf(stderr, "'then' now running '%s'\n", charptr1);
+#endif
return( busy_loop(NULL));
}
@@ -433,7 +448,7 @@ static int builtin_else(struct job *cmd, struct jobSet *junk)
return FALSE;
}
/* If the if result was TRUE, skip the 'else' stuff */
- if (cmd->jobContext & IF_FALSE_CONTEXT) {
+ if (cmd->jobContext & IF_TRUE_CONTEXT) {
return TRUE;
}
@@ -444,7 +459,10 @@ static int builtin_else(struct job *cmd, struct jobSet *junk)
status=strlen(charptr1);
local_pending_command = xmalloc(status+1);
strncpy(local_pending_command, charptr1, status);
- printf("'else' now running '%s'\n", charptr1);
+ local_pending_command[status]='\0';
+#ifdef DEBUG_SHELL
+ fprintf(stderr, "'else' now running '%s'\n", charptr1);
+#endif
return( busy_loop(NULL));
}
@@ -457,7 +475,9 @@ static int builtin_fi(struct job *cmd, struct jobSet *junk)
}
/* Clear out the if and then context bits */
cmd->jobContext &= ~(IF_TRUE_CONTEXT|IF_FALSE_CONTEXT|THEN_EXP_CONTEXT|ELSE_EXP_CONTEXT);
- printf("Hit an fi -- jobContext=%d\n", cmd->jobContext);
+#ifdef DEBUG_SHELL
+ fprintf(stderr, "Hit an fi -- jobContext=%d\n", cmd->jobContext);
+#endif
return TRUE;
}
#endif
@@ -633,12 +653,23 @@ static int getCommand(FILE * source, char *command)
if (source == stdin) {
#ifdef BB_FEATURE_SH_COMMAND_EDITING
int len;
+
+ /*
+ ** enable command line editing only while a command line
+ ** is actually being read; otherwise, we'll end up bequeathing
+ ** atexit() handlers and other unwanted stuff to our
+ ** child processes (rob@sysgo.de)
+ */
+ cmdedit_init();
+ signal(SIGWINCH, win_changed);
len=fprintf(stdout, "%s %s", cwd, prompt);
fflush(stdout);
promptStr=(char*)xmalloc(sizeof(char)*(len+1));
sprintf(promptStr, "%s %s", cwd, prompt);
cmdedit_read_input(promptStr, command);
free( promptStr);
+ cmdedit_terminate();
+ signal(SIGWINCH, SIG_DFL);
return 0;
#else
fprintf(stdout, "%s %s", cwd, prompt);
@@ -944,6 +975,7 @@ static int parseCommand(char **commandPtr, struct job *job, struct jobSet *jobLi
prog->numRedirections = 0;
prog->redirections = NULL;
prog->freeGlob = 0;
+ prog->isStopped = 0;
argc_l = 0;
argvAlloced = 5;
@@ -1108,10 +1140,20 @@ static int runCommand(struct job *newJob, struct jobSet *jobList, int inBg, int
}
}
+#ifdef BB_FEATURE_SH_ENVIRONMENT
+ if (showXtrace==TRUE) {
+ int j;
+ fprintf(stderr, "+ ");
+ for (j = 0; newJob->progs[i].argv[j]; j++)
+ fprintf(stderr, "%s ", newJob->progs[i].argv[j]);
+ fprintf(stderr, "\n");
+ }
+#endif
+
/* Check if the command matches any non-forking builtins */
for (x = bltins; x->cmd; x++) {
if (strcmp(newJob->progs[i].argv[0], x->cmd) == 0 ) {
- return (x->function(newJob, jobList));
+ return(x->function(newJob, jobList));
}
}
@@ -1130,6 +1172,7 @@ static int runCommand(struct job *newJob, struct jobSet *jobList, int inBg, int
dup2(nextout, 1);
dup2(nextout, 2);
close(nextout);
+ close(pipefds[0]);
}
/* explicit redirections override pipes */
@@ -1138,18 +1181,18 @@ static int runCommand(struct job *newJob, struct jobSet *jobList, int inBg, int
/* Check if the command matches any of the other builtins */
for (x = bltins_forking; x->cmd; x++) {
if (strcmp(newJob->progs[i].argv[0], x->cmd) == 0) {
+ applet_name=x->cmd;
exit (x->function(newJob, jobList));
}
}
#ifdef BB_FEATURE_SH_STANDALONE_SHELL
/* Check if the command matches any busybox internal commands here */
- /* TODO: Add matching when paths are appended (i.e. 'cat' currently
- * works, but '/bin/cat' doesn't ) */
while (a->name != 0) {
- if (strcmp(newJob->progs[i].argv[0], a->name) == 0) {
+ if (strcmp(get_last_path_component(newJob->progs[i].argv[0]), a->name) == 0) {
int argc_l;
char** argv=newJob->progs[i].argv;
for(argc_l=0;*argv!=NULL; argv++, argc_l++);
+ applet_name=a->name;
exit((*(a->main)) (argc_l, newJob->progs[i].argv));
}
a++;
@@ -1275,15 +1318,18 @@ static int busy_loop(FILE * input)
jobList.fg->runningProgs--;
jobList.fg->progs[i].pid = 0;
+#ifdef BB_FEATURE_SH_ENVIRONMENT
+ lastReturnCode=WEXITSTATUS(status);
+#endif
+#if 0
+ printf("'%s' exited -- return code %d\n", jobList.fg->text, lastReturnCode);
+#endif
if (!jobList.fg->runningProgs) {
/* child exited */
removeJob(&jobList, jobList.fg);
jobList.fg = NULL;
}
-#ifdef BB_FEATURE_SH_ENVIRONMENT
- lastReturnCode=WEXITSTATUS(status);
-#endif
} else {
/* the child was stopped */
jobList.fg->stoppedProgs++;
@@ -1337,10 +1383,65 @@ void free_memory(void)
int shell_main(int argc_l, char **argv_l)
{
+ int opt;
FILE *input = stdin;
argc = argc_l;
argv = argv_l;
+
+ //if (argv[0] && argv[0][0] == '-') {
+ // builtin_source("/etc/profile");
+ //}
+
+ while ((opt = getopt(argc, argv, "cx")) > 0) {
+ switch (opt) {
+ case 'c':
+ input = NULL;
+ local_pending_command = (char *) calloc(BUFSIZ, sizeof(char));
+ if (local_pending_command == 0) {
+ fatalError("sh: out of memory\n");
+ }
+ for(; optind<argc; optind++)
+ {
+ if (strlen(local_pending_command) + strlen(argv[optind]) >= BUFSIZ) {
+ local_pending_command = realloc(local_pending_command,
+ strlen(local_pending_command) + strlen(argv[optind]));
+ if (local_pending_command==NULL)
+ fatalError("sh: command too long\n");
+ }
+ strcat(local_pending_command, argv[optind]);
+ if ( (optind + 1) < argc)
+ strcat(local_pending_command, " ");
+ }
+ break;
+ case 'x':
+ showXtrace = TRUE;
+ break;
+ default:
+ usage(shell_usage);
+ }
+ }
+
+
+ if (optind<1 && input == stdin) {
+ /* Looks like they want an interactive shell */
+ fprintf(stdout, "\n\nBusyBox v%s (%s) Built-in shell\n", BB_VER, BB_BT);
+ fprintf(stdout, "Enter 'help' for a list of built-in commands.\n\n");
+ } else if (1==(argc-optind)) {
+ input = fopen(argv[optind], "r");
+ if (!input) {
+ fatalError("%s: %s\n", argv[optind], strerror(errno));
+ }
+ } else {
+ char *oldpath, *newpath;
+ oldpath = getenv("PATH");
+ newpath=(char*)xmalloc(strlen(oldpath)+12);
+ snprintf(newpath, strlen(oldpath)+9, "PATH=./:%s", oldpath);
+ putenv(newpath);
+ execvp(argv[optind], argv+optind);
+ fatalError("%s: %s\n", argv[optind], strerror(errno));
+ }
+
/* initialize the cwd -- this is never freed...*/
cwd=(char*)xmalloc(sizeof(char)*MAX_LINE+1);
getcwd(cwd, sizeof(char)*MAX_LINE);
@@ -1350,52 +1451,8 @@ int shell_main(int argc_l, char **argv_l)
#endif
#ifdef BB_FEATURE_SH_COMMAND_EDITING
- cmdedit_init();
- signal(SIGWINCH, win_changed);
win_changed(0);
#endif
- //if (argv[0] && argv[0][0] == '-') {
- // builtin_source("/etc/profile");
- //}
-
-
- if (argc < 2) {
- fprintf(stdout, "\n\nBusyBox v%s (%s) Built-in shell\n", BB_VER, BB_BT);
- fprintf(stdout, "Enter 'help' for a list of built-in commands.\n\n");
- } else {
- if (argv[1][0]=='-' && argv[1][1]=='c') {
- int i;
- local_pending_command = (char *) calloc(BUFSIZ, sizeof(char));
- if (local_pending_command == 0) {
- fatalError("out of memory\n");
- }
- for(i=2; i<argc; i++)
- {
- if (strlen(local_pending_command) + strlen(argv[i]) >= BUFSIZ) {
- local_pending_command = realloc(local_pending_command,
- strlen(local_pending_command) + strlen(argv[i]));
- if (local_pending_command==NULL)
- fatalError("commands for -c option too long\n");
- }
- strcat(local_pending_command, argv[i]);
- if ( (i + 1) < argc)
- strcat(local_pending_command, " ");
- }
- input = NULL;
-
- }
- else if (argv[1][0]=='-') {
- usage(shell_usage);
- }
- else {
- input = fopen(argv[1], "r");
- if (!input) {
- fatalError("Couldn't open file '%s': %s\n", argv[1],
- strerror(errno));
- }
- }
- }
-
return (busy_loop(input));
}
generated by cgit v1.1 at 2024-12-29 07:35:03 +0000