X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=shell%2Fhush.c;h=b74b9d159b8da9cb2ff478227f8e3726b64f9a90;hb=ab6526c8b3d0d38bec62b181276380c0533a151d;hp=3b1e53c8278a13efc800f9fb3d19e3cd34ad41f4;hpb=04407e522b43c37198c8a821723950470d0919f5;p=oweals%2Fbusybox.git diff --git a/shell/hush.c b/shell/hush.c index 3b1e53c82..b74b9d159 100644 --- a/shell/hush.c +++ b/shell/hush.c @@ -217,11 +217,6 @@ struct pipe { reserved_style r_mode; /* supports if, for, while, until */ }; -struct jobset { - struct pipe *head; /* head of list of running jobs */ - struct pipe *fg; /* current foreground job */ -}; - struct close_me { int fd; struct close_me *next; @@ -253,13 +248,16 @@ static int fake_mode; static int interactive; static struct close_me *close_me_head; static const char *cwd; -static struct jobset *job_list; +static struct pipe *job_list; static unsigned int last_bg_pid; +static unsigned int last_jobid; +static unsigned int shell_terminal; static char *PS1; static char *PS2; struct variables shell_ver = { "HUSH_VERSION", "0.01", 1, 1, 0 }; struct variables *top_vars = &shell_ver; + #define B_CHUNK (100) #define B_NOSPAC 1 @@ -361,10 +359,8 @@ static int free_pipe_list(struct pipe *head, int indent); static int free_pipe(struct pipe *pi, int indent); /* really run the final data structures: */ static int setup_redirects(struct child_prog *prog, int squirrel[]); -static int pipe_wait(struct pipe *pi); static int run_list_real(struct pipe *pi); static void pseudo_exec(struct child_prog *child) __attribute__ ((noreturn)); -int controlling_tty(int check_pgrp); static int run_pipe_real(struct pipe *pi); /* extended glob support: */ static int globhack(const char *src, int flags, glob_t *pglob); @@ -392,7 +388,7 @@ static int parse_stream_outer(struct in_str *inp); static int parse_string_outer(const char *s); static int parse_file_outer(FILE *f); /* job management: */ -static void checkjobs(); +static int checkjobs(struct pipe* fg_pipe); static void insert_bg_job(struct pipe *pi); static void remove_bg_job(struct pipe *pi); /* local variable support */ @@ -400,7 +396,6 @@ static char *get_local_var(const char *var); static void unset_local_var(const char *name); static int set_local_var(const char *s, int flg_export); - /* Table of built-in functions. They can be forked or not, depending on * context: within pipes, they fork. As simple commands, they do not. * When used in non-forking context, they can change global variables @@ -543,10 +538,12 @@ static int builtin_fg_bg(struct child_prog *child) int i, jobnum; struct pipe *pi=NULL; + if (!interactive) + return EXIT_FAILURE; /* If they gave us no args, assume they want the last backgrounded task */ if (!child->argv[1]) { - for (pi = job_list->head; pi; pi = pi->next) { - if (pi->progs && pi->progs->pid == last_bg_pid) { + for (pi = job_list; pi; pi = pi->next) { + if (pi->jobid == last_jobid) { break; } } @@ -559,8 +556,7 @@ static int builtin_fg_bg(struct child_prog *child) error_msg("%s: bad argument '%s'", child->argv[0], child->argv[1]); return EXIT_FAILURE; } - - for (pi = job_list->head; pi; pi = pi->next) { + for (pi = job_list; pi; pi = pi->next) { if (pi->jobid == jobnum) { break; } @@ -570,21 +566,23 @@ static int builtin_fg_bg(struct child_prog *child) return EXIT_FAILURE; } } + if (*child->argv[0] == 'f') { - /* Make this job the foreground job */ - signal(SIGTTOU, SIG_IGN); - /* suppress messages when run from /linuxrc mag@sysgo.de */ - if (tcsetpgrp(0, pi->pgrp) && errno != ENOTTY) - perror_msg("tcsetpgrp-1"); - signal(SIGTTOU, SIG_DFL); - job_list->fg = pi; + /* Put the job into the foreground. */ + tcsetpgrp(shell_terminal, pi->pgrp); } /* Restart the processes in the job */ for (i = 0; i < pi->num_progs; i++) pi->progs[i].is_stopped = 0; - kill(-pi->pgrp, SIGCONT); + if ( (i=kill(- pi->pgrp, SIGCONT)) < 0) { + if (i == ESRCH) { + remove_bg_job(pi); + } else { + perror_msg("kill (SIGCONT)"); + } + } pi->stopped_progs = 0; return EXIT_SUCCESS; @@ -612,11 +610,12 @@ static int builtin_jobs(struct child_prog *child) struct pipe *job; char *status_string; - for (job = job_list->head; job; job = job->next) { + for (job = job_list; job; job = job->next) { if (job->running_progs == job->stopped_progs) status_string = "Stopped"; else status_string = "Running"; + printf(JOB_STATUS_FORMAT, job->jobid, status_string, job->text); } return EXIT_SUCCESS; @@ -865,7 +864,7 @@ static inline void setup_prompt_string(int promptmode, char **prompt_str) *prompt_str = PS2; } #else - *prompt_str = (promptmode==0)? PS1 : PS2; + *prompt_str = (promptmode==1)? PS1 : PS2; #endif debug_printf("result %s\n",*prompt_str); } @@ -1044,27 +1043,6 @@ static void restore_redirects(int squirrel[]) } } -/* XXX this definitely needs some more thought, work, and - * cribbing from other shells */ -static int pipe_wait(struct pipe *pi) -{ - int rcode=0, i, pid, running, status; - running = pi->num_progs; - while (running) { - pid=waitpid(-1, &status, 0); - if (pid < 0) perror_msg_and_die("waitpid"); - for (i=0; i < pi->num_progs; i++) { - if (pi->progs[i].pid == pid) { - if (i==pi->num_progs-1) rcode=WEXITSTATUS(status); - pi->progs[i].pid = 0; - running--; - break; - } - } - } - return rcode; -} - /* never returns */ /* XXX no exit() here. If you don't exec, use _exit instead. * The at_exit handlers apparently confuse the calling process, @@ -1161,15 +1139,15 @@ static void insert_bg_job(struct pipe *pi) /* Linear search for the ID of the job to use */ pi->jobid = 1; - for (thejob = job_list->head; thejob; thejob = thejob->next) + for (thejob = job_list; thejob; thejob = thejob->next) if (thejob->jobid >= pi->jobid) pi->jobid = thejob->jobid + 1; /* add thejob to the list of running jobs */ - if (!job_list->head) { - thejob = job_list->head = xmalloc(sizeof(*thejob)); + if (!job_list) { + thejob = job_list = xmalloc(sizeof(*thejob)); } else { - for (thejob = job_list->head; thejob->next; thejob = thejob->next) /* nothing */; + for (thejob = job_list; thejob->next; thejob = thejob->next) /* nothing */; thejob->next = xmalloc(sizeof(*thejob)); thejob = thejob->next; } @@ -1194,40 +1172,65 @@ static void insert_bg_job(struct pipe *pi) to the list of backgrounded thejobs and leave it alone */ printf("[%d] %d\n", thejob->jobid, thejob->progs[0].pid); last_bg_pid = thejob->progs[0].pid; + last_jobid = thejob->jobid; } -/* remove a backgrounded job from a jobset */ +/* remove a backgrounded job */ static void remove_bg_job(struct pipe *pi) { struct pipe *prev_pipe; - if (pi == job_list->head) { - job_list->head = pi->next; + if (pi == job_list) { + job_list = pi->next; } else { - prev_pipe = job_list->head; + prev_pipe = job_list; while (prev_pipe->next != pi) prev_pipe = prev_pipe->next; prev_pipe->next = pi->next; } + if (job_list) + last_jobid = job_list->jobid; + else + last_jobid = 0; + pi->stopped_progs = 0; free_pipe(pi, 0); free(pi); } -/* Checks to see if any background processes have exited -- if they +/* Checks to see if any processes have exited -- if they have, figure out why and see if a job has completed */ -static void checkjobs() +static int checkjobs(struct pipe* fg_pipe) { - int status, ctty; + int attributes; + int status; int prognum = 0; struct pipe *pi; pid_t childpid; - while ((childpid = waitpid(-1, &status, WNOHANG | WUNTRACED)) > 0) { - for (pi = job_list->head; pi; pi = pi->next) { + attributes = WUNTRACED; + if (fg_pipe==NULL) { + attributes |= WNOHANG; + } + + while ((childpid = waitpid(-1, &status, attributes)) > 0) { + if (fg_pipe) { + int i, rcode = 0; + for (i=0; i < fg_pipe->num_progs; i++) { + if (fg_pipe->progs[i].pid == childpid) { + if (i==fg_pipe->num_progs-1) + rcode=WEXITSTATUS(status); + (fg_pipe->num_progs)--; + return(rcode); + } + } + } + + for (pi = job_list; pi; pi = pi->next) { prognum = 0; - while (prognum < pi->num_progs && - pi->progs[prognum].pid != childpid) prognum++; + while (prognum < pi->num_progs && pi->progs[prognum].pid != childpid) { + prognum++; + } if (prognum < pi->num_progs) break; } @@ -1251,9 +1254,14 @@ static void checkjobs() pi->stopped_progs++; pi->progs[prognum].is_stopped = 1; +#if 0 + /* Printing this stuff is a pain, since it tends to + * overwrite the prompt an inconveinient moments. So + * don't do that. */ if (pi->stopped_progs == pi->num_progs) { - printf(JOB_STATUS_FORMAT, pi->jobid, "Stopped", pi->text); + printf("\n"JOB_STATUS_FORMAT, pi->jobid, "Stopped", pi->text); } +#endif } } @@ -1261,35 +1269,37 @@ static void checkjobs() perror_msg("waitpid"); /* move the shell to the foreground */ - if (interactive && (ctty=controlling_tty(0))!=-1) { - if (tcsetpgrp(ctty, getpgrp())) - perror_msg("tcsetpgrp-2"); - } + //if (interactive && tcsetpgrp(shell_terminal, getpgid(0))) + // perror_msg("tcsetpgrp-2"); + return -1; } /* Figure out our controlling tty, checking in order stderr, * stdin, and stdout. If check_pgrp is set, also check that * we belong to the foreground process group associated with - * that tty. The value of ctty is needed in order to call - * tcsetpgrp(ctty, ...); */ -int controlling_tty(int check_pgrp) + * that tty. The value of shell_terminal is needed in order to call + * tcsetpgrp(shell_terminal, ...); */ +void controlling_tty(int check_pgrp) { pid_t curpgrp; - int ctty; - if ((curpgrp = tcgetpgrp(ctty = 2)) < 0 - && (curpgrp = tcgetpgrp(ctty = 0)) < 0 - && (curpgrp = tcgetpgrp(ctty = 1)) < 0) - return errno = ENOTTY, -1; + if ((curpgrp = tcgetpgrp(shell_terminal = 2)) < 0 + && (curpgrp = tcgetpgrp(shell_terminal = 0)) < 0 + && (curpgrp = tcgetpgrp(shell_terminal = 1)) < 0) + goto shell_terminal_error; + + if (check_pgrp && curpgrp != getpgid(0)) + goto shell_terminal_error; - if (check_pgrp && curpgrp != getpgrp()) - return errno = EPERM, -1; + return; - return ctty; +shell_terminal_error: + shell_terminal = -1; + return; } /* run_pipe_real() starts all the jobs, but doesn't wait for anything - * to finish. See pipe_wait(). + * to finish. See checkjobs(). * * return code is normally -1, when the caller has to wait for children * to finish to determine the exit status of the pipe. If the pipe @@ -1307,21 +1317,14 @@ int controlling_tty(int check_pgrp) static int run_pipe_real(struct pipe *pi) { int i; - int ctty; int nextin, nextout; int pipefds[2]; /* pipefds[0] is for reading */ struct child_prog *child; struct built_in_command *x; - ctty = -1; nextin = 0; pi->pgrp = -1; - /* Check if we are supposed to run in the foreground */ - if (interactive && pi->followup!=PIPE_BG) { - if ((ctty = controlling_tty(pi->pgrp<0)) < 0) return -1; - } - /* Check if this is a simple builtin (not part of a pipe). * Builtins within pipes have to fork anyway, and are handled in * pseudo_exec. "echo foo | read bar" doesn't work on bash, either. @@ -1405,8 +1408,13 @@ static int run_pipe_real(struct pipe *pi) /* XXX test for failed fork()? */ if (!(child->pid = fork())) { - + /* Set the handling for job control signals back to the default. */ + signal(SIGINT, SIG_DFL); + signal(SIGQUIT, SIG_DFL); + signal(SIGTSTP, SIG_DFL); + signal(SIGTTIN, SIG_DFL); signal(SIGTTOU, SIG_DFL); + signal(SIGCHLD, SIG_DFL); close_all(); @@ -1425,7 +1433,7 @@ static int run_pipe_real(struct pipe *pi) /* Like bash, explicit redirects override pipes, * and the pipe fd is available for dup'ing. */ setup_redirects(child,NULL); - + if (interactive && pi->followup!=PIPE_BG) { /* If we (the child) win the race, put ourselves in the process * group whose leader is the first process in this pipe. */ @@ -1433,16 +1441,16 @@ static int run_pipe_real(struct pipe *pi) pi->pgrp = getpid(); } if (setpgid(0, pi->pgrp) == 0) { - signal(SIGTTOU, SIG_IGN); - tcsetpgrp(ctty, pi->pgrp); - signal(SIGTTOU, SIG_DFL); + tcsetpgrp(2, pi->pgrp); } } pseudo_exec(child); } - /* Put our child in the process group whose leader is the - * first process in this pipe. */ + + + /* put our child in the process group whose leader is the + first process in this pipe */ if (pi->pgrp < 0) { pi->pgrp = child->pid; } @@ -1489,20 +1497,18 @@ static int run_list_real(struct pipe *pi) insert_bg_job(pi); rcode = EXIT_SUCCESS; } else { - if (interactive) { /* move the new process group into the foreground */ - /* suppress messages when run from /linuxrc mag@sysgo.de */ - /* XXX probably this "0" should come from controlling_tty() */ - if (tcsetpgrp(0, pi->pgrp) && errno != ENOTTY) + if (tcsetpgrp(shell_terminal, pi->pgrp) && errno != ENOTTY) perror_msg("tcsetpgrp-3"); - rcode = pipe_wait(pi); - if (tcsetpgrp(0, getpgrp()) && errno != ENOTTY) + rcode = checkjobs(pi); + /* move the shell to the foreground */ + if (tcsetpgrp(shell_terminal, getpgid(0)) && errno != ENOTTY) perror_msg("tcsetpgrp-4"); } else { - rcode = pipe_wait(pi); + rcode = checkjobs(pi); } - debug_printf("pipe_wait returned %d\n",rcode); + debug_printf("checkjobs returned %d\n",rcode); } last_return_code=rcode; if ( rmode == RES_IF || rmode == RES_ELIF ) @@ -1510,8 +1516,8 @@ static int run_list_real(struct pipe *pi) if ( (rcode==EXIT_SUCCESS && pi->followup==PIPE_OR) || (rcode!=EXIT_SUCCESS && pi->followup==PIPE_AND) ) skip_more_in_this_rmode=rmode; + checkjobs(NULL); } - checkjobs(); return rcode; } @@ -1530,6 +1536,9 @@ static int free_pipe(struct pipe *pi, int indent) struct redir_struct *r, *rnext; int a, i, ret_code=0; char *ind = indenter(indent); + + if (pi->stopped_progs > 0) + return ret_code; final_printf("%s run pipe: (pid %d)\n",ind,getpid()); for (i=0; inum_progs; i++) { child = &pi->progs[i]; @@ -2529,30 +2538,37 @@ static int parse_file_outer(FILE *f) return rcode; } - -/* I think Erik wrote this. It looks imperfect at best */ -void grab_tty_control(void) +/* Make sure we have a controlling tty. If we get started under a job + * aware app (like bash for example), make sure we are now in charge so + * we don't fight over who gets the foreground */ +static void setup_job_control() { - pid_t initialpgrp; - do { - initialpgrp = tcgetpgrp(fileno(stderr)); - if (initialpgrp < 0) { - error_msg("sh: can't access tty; job control disabled\n"); - } - if (initialpgrp == -1) - initialpgrp = getpgrp(); - else if (initialpgrp != getpgrp()) { - killpg(initialpgrp, SIGTTIN); - continue; - } - } while (0); + static pid_t shell_pgrp; + /* Loop until we are in the foreground. */ + while (tcgetpgrp (shell_terminal) != (shell_pgrp = getpgrp ())) + kill (- shell_pgrp, SIGTTIN); + + /* Ignore interactive and job-control signals. */ + signal(SIGINT, SIG_IGN); + signal(SIGQUIT, SIG_IGN); + signal(SIGTSTP, SIG_IGN); + signal(SIGTTIN, SIG_IGN); + signal(SIGTTOU, SIG_IGN); + signal(SIGCHLD, SIG_IGN); + + /* Put ourselves in our own process group. */ + setsid(); + shell_pgrp = getpid (); + setpgid (shell_pgrp, shell_pgrp); + + /* Grab control of the terminal. */ + tcsetpgrp(shell_terminal, shell_pgrp); } int shell_main(int argc, char **argv) { int opt; FILE *input; - struct jobset joblist_end = { NULL, NULL }; char **e = environ; /* XXX what should these be while sourcing /etc/profile? */ @@ -2568,10 +2584,11 @@ int shell_main(int argc, char **argv) interactive = 0; close_me_head = NULL; last_bg_pid = 0; + job_list = NULL; + last_jobid = 0; /* Initialize some more globals to non-zero values */ set_cwd(); - job_list = &joblist_end; #ifdef BB_FEATURE_COMMAND_EDITING cmdedit_set_initial_prompt(); #else @@ -2589,22 +2606,14 @@ int shell_main(int argc, char **argv) last_return_code=EXIT_SUCCESS; - /* If we get started under a job aware app (like bash - * for example), make sure we are now in charge so we - * don't fight over who gets the foreground */ - /* don't pay any attention to this signal; it just confuses - things and isn't really meant for shells anyway */ - signal(SIGTTOU, SIG_IGN); - setpgid(0, getpid()); - tcsetpgrp(fileno(stderr), getpid()); - if (argv[0] && argv[0][0] == '-') { debug_printf("\nsourcing /etc/profile\n"); - input = xfopen("/etc/profile", "r"); - mark_open(fileno(input)); - parse_file_outer(input); - mark_closed(fileno(input)); - fclose(input); + if ((input = fopen("/etc/profile", "r")) != NULL) { + mark_open(fileno(input)); + parse_file_outer(input); + mark_closed(fileno(input)); + fclose(input); + } } input=stdin; @@ -2650,8 +2659,9 @@ int shell_main(int argc, char **argv) if (interactive) { /* Looks like they want an interactive shell */ fprintf(stdout, "\nhush -- the humble shell v0.01 (testing)\n\n"); - grab_tty_control(); + setup_job_control(); } + if (argv[optind]==NULL) { opt=parse_file_outer(stdin); goto final_return;