diff options
Diffstat (limited to 'shell')
| -rw-r--r-- | shell/lash.c | 88 |
1 files changed, 72 insertions, 16 deletions
diff --git a/shell/lash.c b/shell/lash.c index 9e017b169..36e8aa5ea 100644 --- a/shell/lash.c +++ b/shell/lash.c @@ -25,6 +25,12 @@ * */ +/* The parsing engine of this program is officially at a dead-end. + * Future work in that direction should move to the work posted + * at http://doolittle.faludi.com/~larry/parser.html . + * A start on the integration of that work with the rest of sh.c + * is at http://codepoet.org/sh.c . + */ // //This works pretty well now, and is now on by default. #define BB_FEATURE_SH_ENVIRONMENT @@ -117,6 +123,11 @@ 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_env(struct child_prog *dummy); @@ -141,6 +152,8 @@ static int run_command_predicate(char *cmd); /* function prototypes for shell stuff */ +static void mark_open(int fd); +static void mark_closed(int fd); static void checkjobs(struct jobset *job_list); static int get_command(FILE * source, char *command); static int parse_command(char **command_ptr, struct job *job, int *inbg); @@ -194,6 +207,7 @@ static char *local_pending_command; static struct jobset job_list = { NULL, NULL }; static int argc; static char **argv; +static struct close_me *close_me_head = NULL; #ifdef BB_FEATURE_SH_ENVIRONMENT static int last_bg_pid=-1; static int last_return_code=-1; @@ -545,6 +559,7 @@ static int builtin_source(struct child_prog *child) { FILE *input; int status; + int fd; if (child->argv[1] == NULL) return EXIT_FAILURE; @@ -555,9 +570,12 @@ static int builtin_source(struct child_prog *child) return EXIT_FAILURE; } + fd=fileno(input); + mark_open(fd); /* Now run the file */ status = busy_loop(input); fclose(input); + mark_closed(fd); return (status); } @@ -592,6 +610,34 @@ static int run_command_predicate(char *cmd) } #endif +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) + 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; + for (c=close_me_head; c; c=c->next) { + close(c->fd); + } + close_me_head = NULL; +} + + /* free up all memory from a job */ static void free_job(struct job *cmd) { @@ -767,7 +813,7 @@ static char* setup_prompt_string(int state) static int get_command(FILE * source, char *command) { char *prompt_str; - + if (source == NULL) { if (local_pending_command) { /* a command specified (-c option): return it & mark it done */ @@ -781,7 +827,7 @@ static int get_command(FILE * source, char *command) if (source == stdin) { prompt_str = setup_prompt_string(shell_context); - + #ifdef BB_FEATURE_SH_COMMAND_EDITING /* ** enable command line editing only while a command line @@ -791,11 +837,12 @@ static int get_command(FILE * source, char *command) */ cmdedit_init(); cmdedit_read_input(prompt_str, command); - free( prompt_str); + free(prompt_str); cmdedit_terminate(); return 0; #else - fprintf(stdout, "%s", prompt_str); + fputs(prompt_str, stdout); + free(prompt_str); #endif } @@ -1151,6 +1198,9 @@ static int parse_command(char **command_ptr, struct job *job, int *inbg) #ifdef BB_FEATURE_SH_BACKTICKS case '`': /* Exec a backtick-ed command */ + /* Besides any previous brokenness, I have not + * updated backtick handling for close_me support. + * I don't know if it needs it or not. -- LRD */ { char* charptr1=NULL, *charptr2; char* ptr=NULL; @@ -1359,8 +1409,7 @@ static int pseudo_exec(struct child_prog *child) #endif execvp(child->argv[0], child->argv); - error_msg_and_die("%s: %s\n", child->argv[0], - strerror(errno)); + perror_msg_and_die("%s", child->argv[0]); } static void insert_job(struct job *newjob, int inbg) @@ -1464,6 +1513,8 @@ static int run_command(struct job *newjob, int inbg, int outpipe[2]) if (!(child->pid = fork())) { signal(SIGTTOU, SIG_DFL); + close_all(); + if (outpipe[1]!=-1) { close(outpipe[0]); } @@ -1559,7 +1610,8 @@ static int busy_loop(FILE * input) while (!job_list.fg->progs[i].pid || job_list.fg->progs[i].is_stopped == 1) i++; - waitpid(job_list.fg->progs[i].pid, &status, WUNTRACED); + if (waitpid(job_list.fg->progs[i].pid, &status, WUNTRACED)<0) + perror_msg_and_die("waitpid(%d)",job_list.fg->progs[i].pid); if (WIFEXITED(status) || WIFSIGNALED(status)) { /* the child exited */ @@ -1649,15 +1701,18 @@ int shell_main(int argc_l, char **argv_l) #endif if (argv[0] && argv[0][0] == '-') { - FILE *input; - input = fopen("/etc/profile", "r"); - if (!input) { - fprintf(stdout, "Couldn't open file '/etc/profile'\n"); - } else { - /* Now run the file */ - busy_loop(input); - fclose(input); - } + FILE *prof_input; + prof_input = fopen("/etc/profile", "r"); + if (!prof_input) { + fprintf(stdout, "Couldn't open file '/etc/profile'\n"); + } else { + int tmp_fd = fileno(prof_input); + mark_open(tmp_fd); + /* Now run the file */ + busy_loop(prof_input); + fclose(prof_input); + mark_closed(tmp_fd); + } } while ((opt = getopt(argc_l, argv_l, "cxi")) > 0) { @@ -1701,6 +1756,7 @@ int shell_main(int argc_l, char **argv_l) } else if (local_pending_command==NULL) { //fprintf(stdout, "optind=%d argv[optind]='%s'\n", optind, argv[optind]); input = xfopen(argv[optind], "r"); + mark_open(fileno(input)); /* be lazy, never mark this closed */ } /* initialize the cwd -- this is never freed...*/ |