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Some cleanups for hush. Saves about 350bytes.

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-Erik
This commit is contained in:
Eric Andersen 2001-06-22 06:23:03 +00:00
parent a0105713e8
commit c798b07762
2 changed files with 134 additions and 196 deletions
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165
hush.c
View File

@ -217,11 +217,6 @@ struct pipe {
reserved_style r_mode; /* supports if, for, while, until */ 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 { struct close_me {
int fd; int fd;
struct close_me *next; struct close_me *next;
@ -253,8 +248,10 @@ static int fake_mode;
static int interactive; static int interactive;
static struct close_me *close_me_head; static struct close_me *close_me_head;
static const char *cwd; static const char *cwd;
static struct jobset *job_list; static struct pipe *job_list;
static unsigned int last_bg_pid; static unsigned int last_bg_pid;
static unsigned int last_jobid;
static unsigned int ctty;
static char *PS1; static char *PS1;
static char *PS2; static char *PS2;
struct variables shell_ver = { "HUSH_VERSION", "0.01", 1, 1, 0 }; struct variables shell_ver = { "HUSH_VERSION", "0.01", 1, 1, 0 };
@ -361,10 +358,8 @@ static int free_pipe_list(struct pipe *head, int indent);
static int free_pipe(struct pipe *pi, int indent); static int free_pipe(struct pipe *pi, int indent);
/* really run the final data structures: */ /* really run the final data structures: */
static int setup_redirects(struct child_prog *prog, int squirrel[]); 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 int run_list_real(struct pipe *pi);
static void pseudo_exec(struct child_prog *child) __attribute__ ((noreturn)); static void pseudo_exec(struct child_prog *child) __attribute__ ((noreturn));
int controlling_tty(int check_pgrp);
static int run_pipe_real(struct pipe *pi); static int run_pipe_real(struct pipe *pi);
/* extended glob support: */ /* extended glob support: */
static int globhack(const char *src, int flags, glob_t *pglob); static int globhack(const char *src, int flags, glob_t *pglob);
@ -392,7 +387,7 @@ static int parse_stream_outer(struct in_str *inp);
static int parse_string_outer(const char *s); static int parse_string_outer(const char *s);
static int parse_file_outer(FILE *f); static int parse_file_outer(FILE *f);
/* job management: */ /* job management: */
static void checkjobs(); static int checkjobs(struct pipe* fg_pipe);
static void insert_bg_job(struct pipe *pi); static void insert_bg_job(struct pipe *pi);
static void remove_bg_job(struct pipe *pi); static void remove_bg_job(struct pipe *pi);
/* local variable support */ /* local variable support */
@ -543,10 +538,12 @@ static int builtin_fg_bg(struct child_prog *child)
int i, jobnum; int i, jobnum;
struct pipe *pi=NULL; struct pipe *pi=NULL;
if (!interactive)
return EXIT_FAILURE;
/* If they gave us no args, assume they want the last backgrounded task */ /* If they gave us no args, assume they want the last backgrounded task */
if (!child->argv[1]) { if (!child->argv[1]) {
for (pi = job_list->head; pi; pi = pi->next) { for (pi = job_list; pi; pi = pi->next) {
if (pi->progs && pi->progs->pid == last_bg_pid) { if (pi->jobid == last_jobid) {
break; break;
} }
} }
@ -560,7 +557,7 @@ static int builtin_fg_bg(struct child_prog *child)
return EXIT_FAILURE; return EXIT_FAILURE;
} }
for (pi = job_list->head; pi; pi = pi->next) { for (pi = job_list; pi; pi = pi->next) {
if (pi->jobid == jobnum) { if (pi->jobid == jobnum) {
break; break;
} }
@ -574,10 +571,9 @@ static int builtin_fg_bg(struct child_prog *child)
/* Make this job the foreground job */ /* Make this job the foreground job */
signal(SIGTTOU, SIG_IGN); signal(SIGTTOU, SIG_IGN);
/* suppress messages when run from /linuxrc mag@sysgo.de */ /* suppress messages when run from /linuxrc mag@sysgo.de */
if (tcsetpgrp(0, pi->pgrp) && errno != ENOTTY) if (tcsetpgrp(ctty, pi->pgrp) && errno != ENOTTY)
perror_msg("tcsetpgrp-1"); perror_msg("tcsetpgrp-1");
signal(SIGTTOU, SIG_DFL); signal(SIGTTOU, SIG_DFL);
job_list->fg = pi;
} }
/* Restart the processes in the job */ /* Restart the processes in the job */
@ -612,7 +608,7 @@ static int builtin_jobs(struct child_prog *child)
struct pipe *job; struct pipe *job;
char *status_string; 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) if (job->running_progs == job->stopped_progs)
status_string = "Stopped"; status_string = "Stopped";
else else
@ -1044,27 +1040,6 @@ 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 */ /* never returns */
/* XXX no exit() here. If you don't exec, use _exit instead. /* XXX no exit() here. If you don't exec, use _exit instead.
* The at_exit handlers apparently confuse the calling process, * The at_exit handlers apparently confuse the calling process,
@ -1161,15 +1136,15 @@ static void insert_bg_job(struct pipe *pi)
/* Linear search for the ID of the job to use */ /* Linear search for the ID of the job to use */
pi->jobid = 1; 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) if (thejob->jobid >= pi->jobid)
pi->jobid = thejob->jobid + 1; pi->jobid = thejob->jobid + 1;
/* add thejob to the list of running jobs */ /* add thejob to the list of running jobs */
if (!job_list->head) { if (!job_list) {
thejob = job_list->head = xmalloc(sizeof(*thejob)); thejob = job_list= xmalloc(sizeof(*thejob));
} else { } 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->next = xmalloc(sizeof(*thejob));
thejob = thejob->next; thejob = thejob->next;
} }
@ -1194,17 +1169,18 @@ static void insert_bg_job(struct pipe *pi)
to the list of backgrounded thejobs and leave it alone */ to the list of backgrounded thejobs and leave it alone */
printf("[%d] %d\n", thejob->jobid, thejob->progs[0].pid); printf("[%d] %d\n", thejob->jobid, thejob->progs[0].pid);
last_bg_pid = 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) static void remove_bg_job(struct pipe *pi)
{ {
struct pipe *prev_pipe; struct pipe *prev_pipe;
if (pi == job_list->head) { if (pi == job_list) {
job_list->head = pi->next; job_list= pi->next;
} else { } else {
prev_pipe = job_list->head; prev_pipe = job_list;
while (prev_pipe->next != pi) while (prev_pipe->next != pi)
prev_pipe = prev_pipe->next; prev_pipe = prev_pipe->next;
prev_pipe->next = pi->next; prev_pipe->next = pi->next;
@ -1214,17 +1190,35 @@ static void remove_bg_job(struct pipe *pi)
free(pi); 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 */ 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; int prognum = 0;
struct pipe *pi; struct pipe *pi;
pid_t childpid; pid_t childpid;
while ((childpid = waitpid(-1, &status, WNOHANG | WUNTRACED)) > 0) { attributes = WUNTRACED;
for (pi = job_list->head; pi; pi = pi->next) { 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; prognum = 0;
while (prognum < pi->num_progs && while (prognum < pi->num_progs &&
pi->progs[prognum].pid != childpid) prognum++; pi->progs[prognum].pid != childpid) prognum++;
@ -1261,10 +1255,9 @@ static void checkjobs()
perror_msg("waitpid"); perror_msg("waitpid");
/* move the shell to the foreground */ /* move the shell to the foreground */
if (interactive && (ctty=controlling_tty(0))!=-1) { if (interactive && tcsetpgrp(ctty, getpgid(0)))
if (tcsetpgrp(ctty, getpgrp())) perror_msg("tcsetpgrp-2");
perror_msg("tcsetpgrp-2"); return -1;
}
} }
/* Figure out our controlling tty, checking in order stderr, /* Figure out our controlling tty, checking in order stderr,
@ -1272,24 +1265,27 @@ static void checkjobs()
* we belong to the foreground process group associated with * we belong to the foreground process group associated with
* that tty. The value of ctty is needed in order to call * that tty. The value of ctty is needed in order to call
* tcsetpgrp(ctty, ...); */ * tcsetpgrp(ctty, ...); */
int controlling_tty(int check_pgrp) void controlling_tty(int check_pgrp)
{ {
pid_t curpgrp; pid_t curpgrp;
int ctty;
if ((curpgrp = tcgetpgrp(ctty = 2)) < 0 if ((curpgrp = tcgetpgrp(ctty = 2)) < 0
&& (curpgrp = tcgetpgrp(ctty = 0)) < 0 && (curpgrp = tcgetpgrp(ctty = 0)) < 0
&& (curpgrp = tcgetpgrp(ctty = 1)) < 0) && (curpgrp = tcgetpgrp(ctty = 1)) < 0)
return errno = ENOTTY, -1; goto ctty_error;
if (check_pgrp && curpgrp != getpgrp()) if (check_pgrp && curpgrp != getpgid(0))
return errno = EPERM, -1; goto ctty_error;
return ctty; return;
ctty_error:
ctty = -1;
return;
} }
/* run_pipe_real() starts all the jobs, but doesn't wait for anything /* 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 * 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 * to finish to determine the exit status of the pipe. If the pipe
@ -1307,21 +1303,14 @@ int controlling_tty(int check_pgrp)
static int run_pipe_real(struct pipe *pi) static int run_pipe_real(struct pipe *pi)
{ {
int i; int i;
int ctty;
int nextin, nextout; int nextin, nextout;
int pipefds[2]; /* pipefds[0] is for reading */ int pipefds[2]; /* pipefds[0] is for reading */
struct child_prog *child; struct child_prog *child;
struct built_in_command *x; struct built_in_command *x;
ctty = -1;
nextin = 0; nextin = 0;
pi->pgrp = -1; 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). /* Check if this is a simple builtin (not part of a pipe).
* Builtins within pipes have to fork anyway, and are handled in * Builtins within pipes have to fork anyway, and are handled in
* pseudo_exec. "echo foo | read bar" doesn't work on bash, either. * pseudo_exec. "echo foo | read bar" doesn't work on bash, either.
@ -1492,15 +1481,13 @@ static int run_list_real(struct pipe *pi)
if (interactive) { if (interactive) {
/* move the new process group into the foreground */ /* move the new process group into the foreground */
/* suppress messages when run from /linuxrc mag@sysgo.de */ if (tcsetpgrp(ctty, pi->pgrp) && errno != ENOTTY)
/* XXX probably this "0" should come from controlling_tty() */
if (tcsetpgrp(0, pi->pgrp) && errno != ENOTTY)
perror_msg("tcsetpgrp-3"); perror_msg("tcsetpgrp-3");
rcode = pipe_wait(pi); rcode = checkjobs(pi);
if (tcsetpgrp(0, getpgrp()) && errno != ENOTTY) if (tcsetpgrp(ctty, getpgid(0)) && errno != ENOTTY)
perror_msg("tcsetpgrp-4"); perror_msg("tcsetpgrp-4");
} else { } else {
rcode = pipe_wait(pi); rcode = checkjobs(pi);
} }
debug_printf("pipe_wait returned %d\n",rcode); debug_printf("pipe_wait returned %d\n",rcode);
} }
@ -1511,7 +1498,7 @@ static int run_list_real(struct pipe *pi)
(rcode!=EXIT_SUCCESS && pi->followup==PIPE_AND) ) (rcode!=EXIT_SUCCESS && pi->followup==PIPE_AND) )
skip_more_in_this_rmode=rmode; skip_more_in_this_rmode=rmode;
} }
checkjobs(); checkjobs(NULL);
return rcode; return rcode;
} }
@ -2530,29 +2517,10 @@ static int parse_file_outer(FILE *f)
} }
/* I think Erik wrote this. It looks imperfect at best */
void grab_tty_control(void)
{
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);
}
int shell_main(int argc, char **argv) int shell_main(int argc, char **argv)
{ {
int opt; int opt;
FILE *input; FILE *input;
struct jobset joblist_end = { NULL, NULL };
char **e = environ; char **e = environ;
/* XXX what should these be while sourcing /etc/profile? */ /* XXX what should these be while sourcing /etc/profile? */
@ -2568,10 +2536,11 @@ int shell_main(int argc, char **argv)
interactive = 0; interactive = 0;
close_me_head = NULL; close_me_head = NULL;
last_bg_pid = 0; last_bg_pid = 0;
last_jobid = 0;
/* Initialize some more globals to non-zero values */ /* Initialize some more globals to non-zero values */
set_cwd(); set_cwd();
job_list = &joblist_end; job_list = NULL;
#ifdef BB_FEATURE_COMMAND_EDITING #ifdef BB_FEATURE_COMMAND_EDITING
cmdedit_set_initial_prompt(); cmdedit_set_initial_prompt();
#else #else
@ -2594,9 +2563,10 @@ int shell_main(int argc, char **argv)
* don't fight over who gets the foreground */ * don't fight over who gets the foreground */
/* don't pay any attention to this signal; it just confuses /* don't pay any attention to this signal; it just confuses
things and isn't really meant for shells anyway */ things and isn't really meant for shells anyway */
controlling_tty(0);
signal(SIGTTOU, SIG_IGN); signal(SIGTTOU, SIG_IGN);
setpgid(0, getpid()); setpgid(0, getpid());
tcsetpgrp(fileno(stderr), getpid()); tcsetpgrp(ctty, getpid());
if (argv[0] && argv[0][0] == '-') { if (argv[0] && argv[0][0] == '-') {
debug_printf("\nsourcing /etc/profile\n"); debug_printf("\nsourcing /etc/profile\n");
@ -2650,7 +2620,6 @@ int shell_main(int argc, char **argv)
if (interactive) { if (interactive) {
/* Looks like they want an interactive shell */ /* Looks like they want an interactive shell */
fprintf(stdout, "\nhush -- the humble shell v0.01 (testing)\n\n"); fprintf(stdout, "\nhush -- the humble shell v0.01 (testing)\n\n");
grab_tty_control();
} }
if (argv[optind]==NULL) { if (argv[optind]==NULL) {
opt=parse_file_outer(stdin); opt=parse_file_outer(stdin);

165
shell/hush.c
View File

@ -217,11 +217,6 @@ struct pipe {
reserved_style r_mode; /* supports if, for, while, until */ 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 { struct close_me {
int fd; int fd;
struct close_me *next; struct close_me *next;
@ -253,8 +248,10 @@ static int fake_mode;
static int interactive; static int interactive;
static struct close_me *close_me_head; static struct close_me *close_me_head;
static const char *cwd; static const char *cwd;
static struct jobset *job_list; static struct pipe *job_list;
static unsigned int last_bg_pid; static unsigned int last_bg_pid;
static unsigned int last_jobid;
static unsigned int ctty;
static char *PS1; static char *PS1;
static char *PS2; static char *PS2;
struct variables shell_ver = { "HUSH_VERSION", "0.01", 1, 1, 0 }; struct variables shell_ver = { "HUSH_VERSION", "0.01", 1, 1, 0 };
@ -361,10 +358,8 @@ static int free_pipe_list(struct pipe *head, int indent);
static int free_pipe(struct pipe *pi, int indent); static int free_pipe(struct pipe *pi, int indent);
/* really run the final data structures: */ /* really run the final data structures: */
static int setup_redirects(struct child_prog *prog, int squirrel[]); 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 int run_list_real(struct pipe *pi);
static void pseudo_exec(struct child_prog *child) __attribute__ ((noreturn)); static void pseudo_exec(struct child_prog *child) __attribute__ ((noreturn));
int controlling_tty(int check_pgrp);
static int run_pipe_real(struct pipe *pi); static int run_pipe_real(struct pipe *pi);
/* extended glob support: */ /* extended glob support: */
static int globhack(const char *src, int flags, glob_t *pglob); static int globhack(const char *src, int flags, glob_t *pglob);
@ -392,7 +387,7 @@ static int parse_stream_outer(struct in_str *inp);
static int parse_string_outer(const char *s); static int parse_string_outer(const char *s);
static int parse_file_outer(FILE *f); static int parse_file_outer(FILE *f);
/* job management: */ /* job management: */
static void checkjobs(); static int checkjobs(struct pipe* fg_pipe);
static void insert_bg_job(struct pipe *pi); static void insert_bg_job(struct pipe *pi);
static void remove_bg_job(struct pipe *pi); static void remove_bg_job(struct pipe *pi);
/* local variable support */ /* local variable support */
@ -543,10 +538,12 @@ static int builtin_fg_bg(struct child_prog *child)
int i, jobnum; int i, jobnum;
struct pipe *pi=NULL; struct pipe *pi=NULL;
if (!interactive)
return EXIT_FAILURE;
/* If they gave us no args, assume they want the last backgrounded task */ /* If they gave us no args, assume they want the last backgrounded task */
if (!child->argv[1]) { if (!child->argv[1]) {
for (pi = job_list->head; pi; pi = pi->next) { for (pi = job_list; pi; pi = pi->next) {
if (pi->progs && pi->progs->pid == last_bg_pid) { if (pi->jobid == last_jobid) {
break; break;
} }
} }
@ -560,7 +557,7 @@ static int builtin_fg_bg(struct child_prog *child)
return EXIT_FAILURE; return EXIT_FAILURE;
} }
for (pi = job_list->head; pi; pi = pi->next) { for (pi = job_list; pi; pi = pi->next) {
if (pi->jobid == jobnum) { if (pi->jobid == jobnum) {
break; break;
} }
@ -574,10 +571,9 @@ static int builtin_fg_bg(struct child_prog *child)
/* Make this job the foreground job */ /* Make this job the foreground job */
signal(SIGTTOU, SIG_IGN); signal(SIGTTOU, SIG_IGN);
/* suppress messages when run from /linuxrc mag@sysgo.de */ /* suppress messages when run from /linuxrc mag@sysgo.de */
if (tcsetpgrp(0, pi->pgrp) && errno != ENOTTY) if (tcsetpgrp(ctty, pi->pgrp) && errno != ENOTTY)
perror_msg("tcsetpgrp-1"); perror_msg("tcsetpgrp-1");
signal(SIGTTOU, SIG_DFL); signal(SIGTTOU, SIG_DFL);
job_list->fg = pi;
} }
/* Restart the processes in the job */ /* Restart the processes in the job */
@ -612,7 +608,7 @@ static int builtin_jobs(struct child_prog *child)
struct pipe *job; struct pipe *job;
char *status_string; 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) if (job->running_progs == job->stopped_progs)
status_string = "Stopped"; status_string = "Stopped";
else else
@ -1044,27 +1040,6 @@ 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 */ /* never returns */
/* XXX no exit() here. If you don't exec, use _exit instead. /* XXX no exit() here. If you don't exec, use _exit instead.
* The at_exit handlers apparently confuse the calling process, * The at_exit handlers apparently confuse the calling process,
@ -1161,15 +1136,15 @@ static void insert_bg_job(struct pipe *pi)
/* Linear search for the ID of the job to use */ /* Linear search for the ID of the job to use */
pi->jobid = 1; 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) if (thejob->jobid >= pi->jobid)
pi->jobid = thejob->jobid + 1; pi->jobid = thejob->jobid + 1;
/* add thejob to the list of running jobs */ /* add thejob to the list of running jobs */
if (!job_list->head) { if (!job_list) {
thejob = job_list->head = xmalloc(sizeof(*thejob)); thejob = job_list= xmalloc(sizeof(*thejob));
} else { } 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->next = xmalloc(sizeof(*thejob));
thejob = thejob->next; thejob = thejob->next;
} }
@ -1194,17 +1169,18 @@ static void insert_bg_job(struct pipe *pi)
to the list of backgrounded thejobs and leave it alone */ to the list of backgrounded thejobs and leave it alone */
printf("[%d] %d\n", thejob->jobid, thejob->progs[0].pid); printf("[%d] %d\n", thejob->jobid, thejob->progs[0].pid);
last_bg_pid = 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) static void remove_bg_job(struct pipe *pi)
{ {
struct pipe *prev_pipe; struct pipe *prev_pipe;
if (pi == job_list->head) { if (pi == job_list) {
job_list->head = pi->next; job_list= pi->next;
} else { } else {
prev_pipe = job_list->head; prev_pipe = job_list;
while (prev_pipe->next != pi) while (prev_pipe->next != pi)
prev_pipe = prev_pipe->next; prev_pipe = prev_pipe->next;
prev_pipe->next = pi->next; prev_pipe->next = pi->next;
@ -1214,17 +1190,35 @@ static void remove_bg_job(struct pipe *pi)
free(pi); 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 */ 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; int prognum = 0;
struct pipe *pi; struct pipe *pi;
pid_t childpid; pid_t childpid;
while ((childpid = waitpid(-1, &status, WNOHANG | WUNTRACED)) > 0) { attributes = WUNTRACED;
for (pi = job_list->head; pi; pi = pi->next) { 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; prognum = 0;
while (prognum < pi->num_progs && while (prognum < pi->num_progs &&
pi->progs[prognum].pid != childpid) prognum++; pi->progs[prognum].pid != childpid) prognum++;
@ -1261,10 +1255,9 @@ static void checkjobs()
perror_msg("waitpid"); perror_msg("waitpid");
/* move the shell to the foreground */ /* move the shell to the foreground */
if (interactive && (ctty=controlling_tty(0))!=-1) { if (interactive && tcsetpgrp(ctty, getpgid(0)))
if (tcsetpgrp(ctty, getpgrp())) perror_msg("tcsetpgrp-2");
perror_msg("tcsetpgrp-2"); return -1;
}
} }
/* Figure out our controlling tty, checking in order stderr, /* Figure out our controlling tty, checking in order stderr,
@ -1272,24 +1265,27 @@ static void checkjobs()
* we belong to the foreground process group associated with * we belong to the foreground process group associated with
* that tty. The value of ctty is needed in order to call * that tty. The value of ctty is needed in order to call
* tcsetpgrp(ctty, ...); */ * tcsetpgrp(ctty, ...); */
int controlling_tty(int check_pgrp) void controlling_tty(int check_pgrp)
{ {
pid_t curpgrp; pid_t curpgrp;
int ctty;
if ((curpgrp = tcgetpgrp(ctty = 2)) < 0 if ((curpgrp = tcgetpgrp(ctty = 2)) < 0
&& (curpgrp = tcgetpgrp(ctty = 0)) < 0 && (curpgrp = tcgetpgrp(ctty = 0)) < 0
&& (curpgrp = tcgetpgrp(ctty = 1)) < 0) && (curpgrp = tcgetpgrp(ctty = 1)) < 0)
return errno = ENOTTY, -1; goto ctty_error;
if (check_pgrp && curpgrp != getpgrp()) if (check_pgrp && curpgrp != getpgid(0))
return errno = EPERM, -1; goto ctty_error;
return ctty; return;
ctty_error:
ctty = -1;
return;
} }
/* run_pipe_real() starts all the jobs, but doesn't wait for anything /* 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 * 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 * to finish to determine the exit status of the pipe. If the pipe
@ -1307,21 +1303,14 @@ int controlling_tty(int check_pgrp)
static int run_pipe_real(struct pipe *pi) static int run_pipe_real(struct pipe *pi)
{ {
int i; int i;
int ctty;
int nextin, nextout; int nextin, nextout;
int pipefds[2]; /* pipefds[0] is for reading */ int pipefds[2]; /* pipefds[0] is for reading */
struct child_prog *child; struct child_prog *child;
struct built_in_command *x; struct built_in_command *x;
ctty = -1;
nextin = 0; nextin = 0;
pi->pgrp = -1; 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). /* Check if this is a simple builtin (not part of a pipe).
* Builtins within pipes have to fork anyway, and are handled in * Builtins within pipes have to fork anyway, and are handled in
* pseudo_exec. "echo foo | read bar" doesn't work on bash, either. * pseudo_exec. "echo foo | read bar" doesn't work on bash, either.
@ -1492,15 +1481,13 @@ static int run_list_real(struct pipe *pi)
if (interactive) { if (interactive) {
/* move the new process group into the foreground */ /* move the new process group into the foreground */
/* suppress messages when run from /linuxrc mag@sysgo.de */ if (tcsetpgrp(ctty, pi->pgrp) && errno != ENOTTY)
/* XXX probably this "0" should come from controlling_tty() */
if (tcsetpgrp(0, pi->pgrp) && errno != ENOTTY)
perror_msg("tcsetpgrp-3"); perror_msg("tcsetpgrp-3");
rcode = pipe_wait(pi); rcode = checkjobs(pi);
if (tcsetpgrp(0, getpgrp()) && errno != ENOTTY) if (tcsetpgrp(ctty, getpgid(0)) && errno != ENOTTY)
perror_msg("tcsetpgrp-4"); perror_msg("tcsetpgrp-4");
} else { } else {
rcode = pipe_wait(pi); rcode = checkjobs(pi);
} }
debug_printf("pipe_wait returned %d\n",rcode); debug_printf("pipe_wait returned %d\n",rcode);
} }
@ -1511,7 +1498,7 @@ static int run_list_real(struct pipe *pi)
(rcode!=EXIT_SUCCESS && pi->followup==PIPE_AND) ) (rcode!=EXIT_SUCCESS && pi->followup==PIPE_AND) )
skip_more_in_this_rmode=rmode; skip_more_in_this_rmode=rmode;
} }
checkjobs(); checkjobs(NULL);
return rcode; return rcode;
} }
@ -2530,29 +2517,10 @@ static int parse_file_outer(FILE *f)
} }
/* I think Erik wrote this. It looks imperfect at best */
void grab_tty_control(void)
{
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);
}
int shell_main(int argc, char **argv) int shell_main(int argc, char **argv)
{ {
int opt; int opt;
FILE *input; FILE *input;
struct jobset joblist_end = { NULL, NULL };
char **e = environ; char **e = environ;
/* XXX what should these be while sourcing /etc/profile? */ /* XXX what should these be while sourcing /etc/profile? */
@ -2568,10 +2536,11 @@ int shell_main(int argc, char **argv)
interactive = 0; interactive = 0;
close_me_head = NULL; close_me_head = NULL;
last_bg_pid = 0; last_bg_pid = 0;
last_jobid = 0;
/* Initialize some more globals to non-zero values */ /* Initialize some more globals to non-zero values */
set_cwd(); set_cwd();
job_list = &joblist_end; job_list = NULL;
#ifdef BB_FEATURE_COMMAND_EDITING #ifdef BB_FEATURE_COMMAND_EDITING
cmdedit_set_initial_prompt(); cmdedit_set_initial_prompt();
#else #else
@ -2594,9 +2563,10 @@ int shell_main(int argc, char **argv)
* don't fight over who gets the foreground */ * don't fight over who gets the foreground */
/* don't pay any attention to this signal; it just confuses /* don't pay any attention to this signal; it just confuses
things and isn't really meant for shells anyway */ things and isn't really meant for shells anyway */
controlling_tty(0);
signal(SIGTTOU, SIG_IGN); signal(SIGTTOU, SIG_IGN);
setpgid(0, getpid()); setpgid(0, getpid());
tcsetpgrp(fileno(stderr), getpid()); tcsetpgrp(ctty, getpid());
if (argv[0] && argv[0][0] == '-') { if (argv[0] && argv[0][0] == '-') {
debug_printf("\nsourcing /etc/profile\n"); debug_printf("\nsourcing /etc/profile\n");
@ -2650,7 +2620,6 @@ int shell_main(int argc, char **argv)
if (interactive) { if (interactive) {
/* Looks like they want an interactive shell */ /* Looks like they want an interactive shell */
fprintf(stdout, "\nhush -- the humble shell v0.01 (testing)\n\n"); fprintf(stdout, "\nhush -- the humble shell v0.01 (testing)\n\n");
grab_tty_control();
} }
if (argv[optind]==NULL) { if (argv[optind]==NULL) {
opt=parse_file_outer(stdin); opt=parse_file_outer(stdin);