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authorGravatar Rob Landley <rob@landley.net>2006-06-13 18:50:20 +0000
committerGravatar Rob Landley <rob@landley.net>2006-06-13 18:50:20 +0000
commitf94637959902b54b2a1c44e3608fa77158856005 (patch)
treecfea1463aa26aa4189055cf4286b3788e37d4bb1 /shell
parent7c7b0d74372da5fbde67513aa9ce162a555d4765 (diff)
downloadbusybox-f94637959902b54b2a1c44e3608fa77158856005.tar.gz
busybox-f94637959902b54b2a1c44e3608fa77158856005.tar.bz2
Make lash smaller. (Use llist_t for file closing, and different allocation
functions.)
Diffstat (limited to 'shell')
-rw-r--r--shell/lash.c95
1 files changed, 24 insertions, 71 deletions
diff --git a/shell/lash.c b/shell/lash.c
index 733b80cf5..216db8a7e 100644
--- a/shell/lash.c
+++ b/shell/lash.c
@@ -109,11 +109,6 @@ struct built_in_command {
int (*function) (struct child_prog *); /* function ptr */
};
-struct close_me {
- int fd;
- struct close_me *next;
-};
-
/* function prototypes for builtins */
static int builtin_cd(struct child_prog *cmd);
static int builtin_exec(struct child_prog *cmd);
@@ -129,9 +124,6 @@ static int builtin_read(struct child_prog *cmd);
/* function prototypes for shell stuff */
-static void mark_open(int fd);
-static void mark_closed(int fd);
-static void close_all(void);
static void checkjobs(struct jobset *job_list);
static void remove_job(struct jobset *j_list, struct job *job);
static int get_command(FILE * source, char *command);
@@ -177,7 +169,7 @@ static char *local_pending_command = NULL;
static struct jobset job_list = { NULL, NULL };
static int argc;
static char **argv;
-static struct close_me *close_me_head;
+static llist_t *close_me_list;
static int last_return_code;
static int last_bg_pid;
static unsigned int last_jobid;
@@ -251,7 +243,7 @@ static int builtin_exec(struct child_prog *child)
if (child->argv[1] == NULL)
return EXIT_SUCCESS; /* Really? */
child->argv++;
- close_all();
+ while(close_me_list) close((int)llist_pop(&close_me_list));
pseudo_exec(child);
/* never returns */
}
@@ -453,11 +445,11 @@ static int builtin_source(struct child_prog *child)
}
fd=fileno(input);
- mark_open(fd);
+ llist_add_to(&close_me_list, (void *)fd);
/* Now run the file */
status = busy_loop(input);
fclose(input);
- mark_closed(fd);
+ llist_pop(&close_me_list);
return (status);
}
@@ -472,36 +464,6 @@ static int builtin_unset(struct child_prog *child)
return EXIT_SUCCESS;
}
-static void mark_open(int fd)
-{
- struct close_me *new = xmalloc(sizeof(struct close_me));
- new->fd = fd;
- new->next = close_me_head;
- close_me_head = new;
-}
-
-static void mark_closed(int fd)
-{
- struct close_me *tmp;
- if (close_me_head == NULL || close_me_head->fd != fd)
- bb_error_msg_and_die("corrupt close_me");
- tmp = close_me_head;
- close_me_head = close_me_head->next;
- free(tmp);
-}
-
-static void close_all()
-{
- struct close_me *c, *tmp;
- for (c=close_me_head; c; c=tmp) {
- close(c->fd);
- tmp=c->next;
- free(c);
- }
- close_me_head = NULL;
-}
-
-
#ifdef CONFIG_LASH_JOB_CONTROL
/* free up all memory from a job */
static void free_job(struct job *cmd)
@@ -769,33 +731,29 @@ static char* itoa(register int i)
static char * strsep_space( char *string, int * ix)
{
- char *token, *begin;
-
- begin = string;
+ char *token;
/* Short circuit the trivial case */
if ( !string || ! string[*ix])
return NULL;
/* Find the end of the token. */
- while( string && string[*ix] && !isspace(string[*ix]) ) {
+ while( string[*ix] && !isspace(string[*ix]) ) {
(*ix)++;
}
/* 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]) ) {
+ while( string[*ix] && isspace(string[*ix]) ) {
(*ix)++;
}
- if (! string && *ix==0) {
+ if (!*ix) {
/* Nothing useful was found */
return NULL;
}
- token = xmalloc(*ix+1);
- token[*ix] = '\0';
- strncpy(token, string, *ix);
+ token = bb_xstrndup(string, *ix);
return token;
}
@@ -980,7 +938,6 @@ static int parse_command(char **command_ptr, struct job *job, int *inbg)
int argv_alloced;
int saw_quote = 0;
char quote = '\0';
- int count;
struct child_prog *prog;
#ifdef CONFIG_LASH_PIPE_N_REDIRECTS
int i;
@@ -1008,7 +965,7 @@ static int parse_command(char **command_ptr, struct job *job, int *inbg)
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->cmdbuf = command = xzalloc(2*strlen(*command_ptr) + 1);
job->text = NULL;
prog = job->progs;
@@ -1209,14 +1166,10 @@ static int parse_command(char **command_ptr, struct job *job, int *inbg)
prog->argv[argc_l] = NULL;
if (!return_command) {
- job->text = xmalloc(strlen(*command_ptr) + 1);
- strcpy(job->text, *command_ptr);
+ job->text = bb_xstrdup(*command_ptr);
} else {
/* This leaves any trailing spaces, which is a bit sloppy */
- count = return_command - *command_ptr;
- job->text = xmalloc(count + 1);
- strncpy(job->text, *command_ptr, count);
- job->text[count] = '\0';
+ job->text = bb_xstrndup(*command_ptr, return_command - *command_ptr);
}
*command_ptr = return_command;
@@ -1320,9 +1273,8 @@ static void insert_job(struct job *newjob, int inbg)
newjob->job_list->fg = thejob;
/* move the new process group into the foreground */
- /* suppress messages when run from /linuxrc mag@sysgo.de */
- if (tcsetpgrp(shell_terminal, newjob->pgrp) && errno != ENOTTY)
- bb_perror_msg("tcsetpgrp");
+ /* Ignore errors since child could have already exited */
+ tcsetpgrp(shell_terminal, newjob->pgrp);
}
#endif
}
@@ -1385,7 +1337,8 @@ static int run_command(struct job *newjob, int inbg, int outpipe[2])
signal(SIGTTOU, SIG_DFL);
signal(SIGCHLD, SIG_DFL);
- close_all();
+ // Close all open filehandles.
+ while(close_me_list) close((int)llist_pop(&close_me_list));
if (outpipe[1]!=-1) {
close(outpipe[0]);
@@ -1447,7 +1400,7 @@ static int busy_loop(FILE * input)
newjob.job_list = &job_list;
newjob.job_context = DEFAULT_CONTEXT;
- command = (char *) xcalloc(BUFSIZ, sizeof(char));
+ command = xzalloc(BUFSIZ);
while (1) {
if (!job_list.fg) {
@@ -1464,7 +1417,7 @@ static int busy_loop(FILE * input)
if (! expand_arguments(next_command)) {
free(command);
- command = (char *) xcalloc(BUFSIZ, sizeof(char));
+ command = xzalloc(BUFSIZ);
next_command = NULL;
continue;
}
@@ -1478,7 +1431,7 @@ static int busy_loop(FILE * input)
}
else {
free(command);
- command = (char *) xcalloc(BUFSIZ, sizeof(char));
+ command = (char *) xzalloc(BUFSIZ);
next_command = NULL;
}
} else {
@@ -1607,7 +1560,7 @@ int lash_main(int argc_l, char **argv_l)
/* These variables need re-initializing when recursing */
last_jobid = 0;
local_pending_command = NULL;
- close_me_head = NULL;
+ close_me_list = NULL;
job_list.head = NULL;
job_list.fg = NULL;
last_return_code=1;
@@ -1616,12 +1569,11 @@ int lash_main(int argc_l, char **argv_l)
FILE *prof_input;
prof_input = fopen("/etc/profile", "r");
if (prof_input) {
- int tmp_fd = fileno(prof_input);
- mark_open(tmp_fd);
+ llist_add_to(&close_me_list, (void *)fileno(prof_input));
/* Now run the file */
busy_loop(prof_input);
fclose(prof_input);
- mark_closed(tmp_fd);
+ llist_pop(&close_me_list);
}
}
@@ -1664,7 +1616,8 @@ int lash_main(int argc_l, char **argv_l)
} else if (local_pending_command==NULL) {
//printf( "optind=%d argv[optind]='%s'\n", optind, argv[optind]);
input = bb_xfopen(argv[optind], "r");
- mark_open(fileno(input)); /* be lazy, never mark this closed */
+ /* be lazy, never mark this closed */
+ llist_add_to(&close_me_list, (void *)fileno(input));
}
/* initialize the cwd -- this is never freed...*/