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-rw-r--r--lash.c61
-rw-r--r--shell/lash.c61
2 files changed, 92 insertions, 30 deletions
diff --git a/lash.c b/lash.c
index 689c720..68f6735 100644
--- a/lash.c
+++ b/lash.c
@@ -44,6 +44,7 @@
#include <sys/wait.h>
#include <unistd.h>
#include <getopt.h>
+#include <termios.h>
#include "busybox.h"
#include "cmdedit.h"
@@ -181,7 +182,8 @@ static int argc;
static char **argv;
static struct close_me *close_me_head;
static unsigned int last_jobid;
-
+static int shell_terminal;
+static pid_t shell_pgrp;
static char *PS1;
static char *PS2 = "> ";
@@ -299,10 +301,9 @@ static int builtin_fg_bg(struct child_prog *child)
}
if (*child->argv[0] == 'f') {
- /* Make this job the foreground job */
- /* suppress messages when run from /linuxrc mag@sysgo.de */
- if (tcsetpgrp(0, job->pgrp) && errno != ENOTTY)
- perror_msg("tcsetpgrp");
+ /* Put the job into the foreground. */
+ tcsetpgrp(shell_terminal, job->pgrp);
+
child->family->job_list->fg = job;
}
@@ -310,10 +311,11 @@ static int builtin_fg_bg(struct child_prog *child)
for (i = 0; i < job->num_progs; i++)
job->progs[i].is_stopped = 0;
- kill(-job->pgrp, SIGCONT);
-
job->stopped_progs = 0;
+ if (kill(- job->pgrp, SIGCONT) < 0)
+ perror_msg("kill (SIGCONT)");
+
return EXIT_SUCCESS;
}
@@ -1081,7 +1083,7 @@ static void insert_job(struct job *newjob, int inbg)
/* move the new process group into the foreground */
/* suppress messages when run from /linuxrc mag@sysgo.de */
- if (tcsetpgrp(0, newjob->pgrp) && errno != ENOTTY)
+ if (tcsetpgrp(shell_terminal, newjob->pgrp) && errno != ENOTTY)
perror_msg("tcsetpgrp");
}
}
@@ -1131,7 +1133,13 @@ static int run_command(struct job *newjob, int inbg, int outpipe[2])
}
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();
@@ -1192,14 +1200,10 @@ static int busy_loop(FILE * input)
newjob.job_context = DEFAULT_CONTEXT;
/* save current owner of TTY so we can restore it on exit */
- parent_pgrp = tcgetpgrp(0);
+ parent_pgrp = tcgetpgrp(shell_terminal);
command = (char *) xcalloc(BUFSIZ, sizeof(char));
- /* don't pay any attention to this signal; it just confuses
- things and isn't really meant for shells anyway */
- signal(SIGTTOU, SIG_IGN);
-
while (1) {
if (!job_list.fg) {
/* no job is in the foreground */
@@ -1266,7 +1270,7 @@ static int busy_loop(FILE * input)
if (!job_list.fg) {
/* move the shell to the foreground */
/* suppress messages when run from /linuxrc mag@sysgo.de */
- if (tcsetpgrp(0, getpgrp()) && errno != ENOTTY)
+ if (tcsetpgrp(shell_terminal, getpgrp()) && errno != ENOTTY)
perror_msg("tcsetpgrp");
}
}
@@ -1274,7 +1278,7 @@ static int busy_loop(FILE * input)
free(command);
/* return controlling TTY back to parent process group before exiting */
- if (tcsetpgrp(0, parent_pgrp))
+ if (tcsetpgrp(shell_terminal, parent_pgrp))
perror_msg("tcsetpgrp");
/* return exit status if called with "-c" */
@@ -1300,6 +1304,32 @@ void free_memory(void)
}
#endif
+/* 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()
+{
+ /* 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. */
+ shell_pgrp = getpid ();
+ if (setpgid (shell_pgrp, shell_pgrp) < 0) {
+ perror_msg_and_die("Couldn't put the shell in its own process group");
+ }
+
+ /* Grab control of the terminal. */
+ tcsetpgrp(shell_terminal, shell_pgrp);
+}
int shell_main(int argc_l, char **argv_l)
{
@@ -1359,6 +1389,7 @@ int shell_main(int argc_l, char **argv_l)
isatty(fileno(stdin)) && isatty(fileno(stdout))) {
interactive=TRUE;
}
+ setup_job_control();
if (interactive==TRUE) {
//printf( "optind=%d argv[optind]='%s'\n", optind, argv[optind]);
/* Looks like they want an interactive shell */
diff --git a/shell/lash.c b/shell/lash.c
index 689c720..68f6735 100644
--- a/shell/lash.c
+++ b/shell/lash.c
@@ -44,6 +44,7 @@
#include <sys/wait.h>
#include <unistd.h>
#include <getopt.h>
+#include <termios.h>
#include "busybox.h"
#include "cmdedit.h"
@@ -181,7 +182,8 @@ static int argc;
static char **argv;
static struct close_me *close_me_head;
static unsigned int last_jobid;
-
+static int shell_terminal;
+static pid_t shell_pgrp;
static char *PS1;
static char *PS2 = "> ";
@@ -299,10 +301,9 @@ static int builtin_fg_bg(struct child_prog *child)
}
if (*child->argv[0] == 'f') {
- /* Make this job the foreground job */
- /* suppress messages when run from /linuxrc mag@sysgo.de */
- if (tcsetpgrp(0, job->pgrp) && errno != ENOTTY)
- perror_msg("tcsetpgrp");
+ /* Put the job into the foreground. */
+ tcsetpgrp(shell_terminal, job->pgrp);
+
child->family->job_list->fg = job;
}
@@ -310,10 +311,11 @@ static int builtin_fg_bg(struct child_prog *child)
for (i = 0; i < job->num_progs; i++)
job->progs[i].is_stopped = 0;
- kill(-job->pgrp, SIGCONT);
-
job->stopped_progs = 0;
+ if (kill(- job->pgrp, SIGCONT) < 0)
+ perror_msg("kill (SIGCONT)");
+
return EXIT_SUCCESS;
}
@@ -1081,7 +1083,7 @@ static void insert_job(struct job *newjob, int inbg)
/* move the new process group into the foreground */
/* suppress messages when run from /linuxrc mag@sysgo.de */
- if (tcsetpgrp(0, newjob->pgrp) && errno != ENOTTY)
+ if (tcsetpgrp(shell_terminal, newjob->pgrp) && errno != ENOTTY)
perror_msg("tcsetpgrp");
}
}
@@ -1131,7 +1133,13 @@ static int run_command(struct job *newjob, int inbg, int outpipe[2])
}
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();
@@ -1192,14 +1200,10 @@ static int busy_loop(FILE * input)
newjob.job_context = DEFAULT_CONTEXT;
/* save current owner of TTY so we can restore it on exit */
- parent_pgrp = tcgetpgrp(0);
+ parent_pgrp = tcgetpgrp(shell_terminal);
command = (char *) xcalloc(BUFSIZ, sizeof(char));
- /* don't pay any attention to this signal; it just confuses
- things and isn't really meant for shells anyway */
- signal(SIGTTOU, SIG_IGN);
-
while (1) {
if (!job_list.fg) {
/* no job is in the foreground */
@@ -1266,7 +1270,7 @@ static int busy_loop(FILE * input)
if (!job_list.fg) {
/* move the shell to the foreground */
/* suppress messages when run from /linuxrc mag@sysgo.de */
- if (tcsetpgrp(0, getpgrp()) && errno != ENOTTY)
+ if (tcsetpgrp(shell_terminal, getpgrp()) && errno != ENOTTY)
perror_msg("tcsetpgrp");
}
}
@@ -1274,7 +1278,7 @@ static int busy_loop(FILE * input)
free(command);
/* return controlling TTY back to parent process group before exiting */
- if (tcsetpgrp(0, parent_pgrp))
+ if (tcsetpgrp(shell_terminal, parent_pgrp))
perror_msg("tcsetpgrp");
/* return exit status if called with "-c" */
@@ -1300,6 +1304,32 @@ void free_memory(void)
}
#endif
+/* 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()
+{
+ /* 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. */
+ shell_pgrp = getpid ();
+ if (setpgid (shell_pgrp, shell_pgrp) < 0) {
+ perror_msg_and_die("Couldn't put the shell in its own process group");
+ }
+
+ /* Grab control of the terminal. */
+ tcsetpgrp(shell_terminal, shell_pgrp);
+}
int shell_main(int argc_l, char **argv_l)
{
@@ -1359,6 +1389,7 @@ int shell_main(int argc_l, char **argv_l)
isatty(fileno(stdin)) && isatty(fileno(stdout))) {
interactive=TRUE;
}
+ setup_job_control();
if (interactive==TRUE) {
//printf( "optind=%d argv[optind]='%s'\n", optind, argv[optind]);
/* Looks like they want an interactive shell */
generated by cgit v1.1 at 2024-12-25 17:19:06 +0000