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Diffstat (limited to 'shell')
-rw-r--r--shell/lash.c113
1 files changed, 73 insertions, 40 deletions
diff --git a/shell/lash.c b/shell/lash.c
index bb258c788..f4564f7f7 100644
--- a/shell/lash.c
+++ b/shell/lash.c
@@ -106,9 +106,9 @@ static int builtin_read(struct job *cmd, struct jobSet *junk);
/* function prototypes for shell stuff */
static void checkJobs(struct jobSet *jobList);
static int getCommand(FILE * source, char *command);
-static int parseCommand(char **commandPtr, struct job *job, int *isBg);
+static int parseCommand(char **commandPtr, struct job *job, struct jobSet *jobList, int *isBg);
static int setupRedirections(struct childProgram *prog);
-static int runCommand(struct job newJob, struct jobSet *jobList, int inBg);
+static int runCommand(struct job *newJob, struct jobSet *jobList, int inBg);
static int busy_loop(FILE * input);
@@ -389,6 +389,7 @@ static void freeJob(struct job *cmd)
if (cmd->text)
free(cmd->text);
free(cmd->cmdBuf);
+ memset(cmd, 0, sizeof(struct job));
}
/* remove a job from the jobList */
@@ -471,7 +472,7 @@ static int getCommand(FILE * source, char *command)
char *promptStr;
len=fprintf(stdout, "%s %s", cwd, prompt);
fflush(stdout);
- promptStr=(char*)malloc(sizeof(char)*(len+1));
+ promptStr=(char*)xmalloc(sizeof(char)*(len+1));
sprintf(promptStr, "%s %s", cwd, prompt);
cmdedit_read_input(promptStr, command);
free( promptStr);
@@ -550,7 +551,7 @@ static void globLastArgument(struct childProgram *prog, int *argcPtr,
the beginning of the next command (if the original command had more
then one job associated with it) or NULL if no more commands are
present. */
-static int parseCommand(char **commandPtr, struct job *job, int *isBg)
+static int parseCommand(char **commandPtr, struct job *job, struct jobSet *jobList, int *isBg)
{
char *command;
char *returnCommand = NULL;
@@ -569,14 +570,13 @@ static int parseCommand(char **commandPtr, struct job *job, int *isBg)
/* this handles empty lines or leading '#' characters */
if (!**commandPtr || (**commandPtr == '#')) {
- job->numProgs = 0;
- *commandPtr = NULL;
+ job->numProgs=0;
return 0;
}
*isBg = 0;
job->numProgs = 1;
- job->progs = malloc(sizeof(*job->progs));
+ job->progs = xmalloc(sizeof(*job->progs));
/* We set the argv elements to point inside of this string. The
memory is freed by freeJob(). Allocate twice the original
@@ -595,7 +595,7 @@ static int parseCommand(char **commandPtr, struct job *job, int *isBg)
prog->isStopped = 0;
argvAlloced = 5;
- prog->argv = malloc(sizeof(*prog->argv) * argvAlloced);
+ prog->argv = xmalloc(sizeof(*prog->argv) * argvAlloced);
prog->argv[0] = job->cmdBuf;
buf = command;
@@ -688,6 +688,7 @@ static int parseCommand(char **commandPtr, struct job *job, int *isBg)
if (!*chptr) {
fprintf(stderr, "file name expected after %c\n", *src);
freeJob(job);
+ job->numProgs=0;
return 1;
}
@@ -704,8 +705,9 @@ static int parseCommand(char **commandPtr, struct job *job, int *isBg)
if (*prog->argv[argc])
argc++;
if (!argc) {
- fprintf(stderr, "empty command in pipe\n");
+ fprintf(stderr, "empty command in pipe1.\n");
freeJob(job);
+ job->numProgs=0;
return 1;
}
prog->argv[argc] = NULL;
@@ -721,7 +723,7 @@ static int parseCommand(char **commandPtr, struct job *job, int *isBg)
argc = 0;
argvAlloced = 5;
- prog->argv = malloc(sizeof(*prog->argv) * argvAlloced);
+ prog->argv = xmalloc(sizeof(*prog->argv) * argvAlloced);
prog->argv[0] = ++buf;
src++;
@@ -729,7 +731,9 @@ static int parseCommand(char **commandPtr, struct job *job, int *isBg)
src++;
if (!*src) {
- fprintf(stderr, "empty command in pipe\n");
+ fprintf(stderr, "empty command in pipe2\n");
+ freeJob(job);
+ job->numProgs=0;
return 1;
}
src--; /* we'll ++ it at the end of the loop */
@@ -746,13 +750,40 @@ static int parseCommand(char **commandPtr, struct job *job, int *isBg)
case '\\':
src++;
if (!*src) {
- freeJob(job);
fprintf(stderr, "character expected after \\\n");
+ freeJob(job);
return 1;
}
if (*src == '*' || *src == '[' || *src == ']'
|| *src == '?') *buf++ = '\\';
/* fallthrough */
+ case '`':
+ /* Exec a backtick-ed command */
+ {
+ char* newcmd=NULL;
+ char* ptr=NULL;
+ struct job newJob;
+
+ ptr=strchr(++src, '`');
+ if (ptr==NULL) {
+ fprintf(stderr, "Unmatched '`' in command\n");
+ freeJob(job);
+ return 1;
+ }
+
+ newcmd = xmalloc(1+ptr-src);
+ snprintf(newcmd, 1+ptr-src, src);
+
+ if (!parseCommand(&newcmd, &newJob, jobList, isBg) &&
+ newJob.numProgs) {
+ runCommand(&newJob, jobList, *isBg);
+ }
+
+ /* Clip out the the backticked command from the string */
+ memmove(--src, ptr, strlen(ptr)+1);
+ free(newcmd);
+ }
+ break;
default:
*buf++ = *src;
}
@@ -771,12 +802,12 @@ static int parseCommand(char **commandPtr, struct job *job, int *isBg)
prog->argv[argc] = NULL;
if (!returnCommand) {
- job->text = malloc(strlen(*commandPtr) + 1);
+ job->text = xmalloc(strlen(*commandPtr) + 1);
strcpy(job->text, *commandPtr);
} else {
/* This leaves any trailing spaces, which is a bit sloppy */
count = returnCommand - *commandPtr;
- job->text = malloc(count + 1);
+ job->text = xmalloc(count + 1);
strncpy(job->text, *commandPtr, count);
job->text[count] = '\0';
}
@@ -787,7 +818,7 @@ static int parseCommand(char **commandPtr, struct job *job, int *isBg)
}
-static int runCommand(struct job newJob, struct jobSet *jobList, int inBg)
+static int runCommand(struct job *newJob, struct jobSet *jobList, int inBg)
{
struct job *job;
int i;
@@ -800,8 +831,8 @@ static int runCommand(struct job newJob, struct jobSet *jobList, int inBg)
nextin = 0, nextout = 1;
- for (i = 0; i < newJob.numProgs; i++) {
- if ((i + 1) < newJob.numProgs) {
+ for (i = 0; i < newJob->numProgs; i++) {
+ if ((i + 1) < newJob->numProgs) {
pipe(pipefds);
nextout = pipefds[1];
} else {
@@ -810,12 +841,12 @@ static int runCommand(struct job newJob, struct jobSet *jobList, int inBg)
/* Check if the command matches any non-forking builtins */
for (x = bltins; x->cmd; x++) {
- if (!strcmp(newJob.progs[i].argv[0], x->cmd)) {
- return (x->function(&newJob, jobList));
+ if (!strcmp(newJob->progs[i].argv[0], x->cmd)) {
+ return (x->function(newJob, jobList));
}
}
- if (!(newJob.progs[i].pid = fork())) {
+ if (!(newJob->progs[i].pid = fork())) {
signal(SIGTTOU, SIG_DFL);
if (nextin != 0) {
@@ -829,12 +860,12 @@ static int runCommand(struct job newJob, struct jobSet *jobList, int inBg)
}
/* explicit redirections override pipes */
- setupRedirections(newJob.progs + i);
+ setupRedirections(newJob->progs + i);
/* Check if the command matches any of the other builtins */
for (x = bltins_forking; x->cmd; x++) {
- if (!strcmp(newJob.progs[i].argv[0], x->cmd)) {
- exit (x->function(&newJob, jobList));
+ if (!strcmp(newJob->progs[i].argv[0], x->cmd)) {
+ exit (x->function(newJob, jobList));
}
}
#ifdef BB_FEATURE_SH_STANDALONE_SHELL
@@ -842,24 +873,24 @@ static int runCommand(struct job newJob, struct jobSet *jobList, int inBg)
/* TODO: Add matching when paths are appended (i.e. 'cat' currently
* works, but '/bin/cat' doesn't ) */
while (a->name != 0) {
- if (strcmp(newJob.progs[i].argv[0], a->name) == 0) {
+ if (strcmp(newJob->progs[i].argv[0], a->name) == 0) {
int argc;
- char** argv=newJob.progs[i].argv;
+ char** argv=newJob->progs[i].argv;
for(argc=0;*argv!=NULL; argv++, argc++);
- exit((*(a->main)) (argc, newJob.progs[i].argv));
+ exit((*(a->main)) (argc, newJob->progs[i].argv));
}
a++;
}
#endif
- execvp(newJob.progs[i].argv[0], newJob.progs[i].argv);
- fatalError("%s: %s\n", newJob.progs[i].argv[0],
+ execvp(newJob->progs[i].argv[0], newJob->progs[i].argv);
+ fatalError("%s: %s\n", newJob->progs[i].argv[0],
strerror(errno));
}
/* put our child in the process group whose leader is the
first process in this pipe */
- setpgid(newJob.progs[i].pid, newJob.progs[0].pid);
+ setpgid(newJob->progs[i].pid, newJob->progs[0].pid);
if (nextin != 0)
close(nextin);
@@ -871,24 +902,24 @@ static int runCommand(struct job newJob, struct jobSet *jobList, int inBg)
nextin = pipefds[0];
}
- newJob.pgrp = newJob.progs[0].pid;
+ newJob->pgrp = newJob->progs[0].pid;
/* find the ID for the job to use */
- newJob.jobId = 1;
+ newJob->jobId = 1;
for (job = jobList->head; job; job = job->next)
- if (job->jobId >= newJob.jobId)
- newJob.jobId = job->jobId + 1;
+ if (job->jobId >= newJob->jobId)
+ newJob->jobId = job->jobId + 1;
/* add the job to the list of running jobs */
if (!jobList->head) {
- job = jobList->head = malloc(sizeof(*job));
+ job = jobList->head = xmalloc(sizeof(*job));
} else {
for (job = jobList->head; job->next; job = job->next);
- job->next = malloc(sizeof(*job));
+ job->next = xmalloc(sizeof(*job));
job = job->next;
}
- *job = newJob;
+ *job = *newJob;
job->next = NULL;
job->runningProgs = job->numProgs;
job->stoppedProgs = 0;
@@ -897,13 +928,13 @@ static int runCommand(struct job newJob, struct jobSet *jobList, int inBg)
/* we don't wait for background jobs to return -- append it
to the list of backgrounded jobs and leave it alone */
printf("[%d] %d\n", job->jobId,
- newJob.progs[newJob.numProgs - 1].pid);
+ newJob->progs[newJob->numProgs - 1].pid);
} else {
jobList->fg = job;
/* 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(0, newJob->pgrp) && errno != ENOTTY)
perror("tcsetpgrp");
}
@@ -982,9 +1013,11 @@ static int busy_loop(FILE * input)
nextCommand = command;
}
- if (!parseCommand(&nextCommand, &newJob, &inBg) &&
+ if (!parseCommand(&nextCommand, &newJob, &jobList, &inBg) &&
newJob.numProgs) {
- runCommand(newJob, &jobList, inBg);
+ runCommand(&newJob, &jobList, inBg);
+ } else {
+ nextCommand=NULL;
}
} else {
/* a job is running in the foreground; wait for it */
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-20 02:58:49 +0000