some pipe support in sh
bug in proc_wait
This commit is contained in:
kaashoek
parent
d49a2d5386
commit
21a88dd053
3 changed files with 141 additions and 85 deletions
2
proc.c
2
proc.c
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@ -371,7 +371,7 @@ proc_wait(void)
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havekids = 0;
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for(i = 0; i < NPROC; i++){
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p = &proc[i];
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if(p->ppid == cp->pid){
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if(p->state != UNUSED && p->ppid == cp->pid){
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if(p->state == ZOMBIE){
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// Found one.
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kfree(p->mem, p->sz);
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162
sh.c
162
sh.c
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@ -7,21 +7,28 @@
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#define BUFSIZ 512
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#define MAXARGS 10
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#define MAXNODE 2
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#define MAXCMD 2
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// only allocate nodes for i/o redir; at some point we may have to build a
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// a real parse tree.
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struct node {
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// an embarrassingly naive shell
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// some day a real parse tree; for now ad-hoc
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struct ionode {
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int token;
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char *s;
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};
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struct node list[MAXNODE];
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int nextnode;
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struct ionode iolist[MAXNODE];
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int nextio;
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struct cmd {
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char *argv[MAXARGS];
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char argv0buf[BUFSIZ];
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int argc;
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int token;
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};
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struct cmd cmdlist[MAXCMD];
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int nextcmd;
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char buf[BUFSIZ];
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char *argv[MAXARGS];
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char argv0buf[BUFSIZ];
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int argc;
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int debug = 0;
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int parse(char *s);
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@ -29,7 +36,7 @@ void runcmd(void);
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int ioredirection(void);
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int gettoken(char *s, char **token);
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int _gettoken(char *s, char **p1, char **p2);
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void addnode(int token, char *s);
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void addio(int token, char *s);
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int
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main(void)
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@ -48,21 +55,25 @@ int
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parse(char *s)
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{
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char *t;
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int c;
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int c, i;
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gettoken(s, 0);
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argc = 0;
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nextnode = 0;
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nextio = 0;
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nextcmd = 0;
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for (i = 0; i < MAXCMD; i++) {
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cmdlist[i].argc = 0;
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cmdlist[i].token = 0;
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}
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while (1) {
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switch ((c = gettoken(0, &t))) {
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case 'w': // Add an argument
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if (argc == MAXARGS) {
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if (cmdlist[nextcmd].argc >= MAXARGS) {
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printf(2, "too many arguments\n");
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return -1;
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}
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argv[argc++] = t;
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cmdlist[nextcmd].argv[cmdlist[nextcmd].argc++] = t;
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break;
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case '<': // Input redirection
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@ -71,7 +82,7 @@ parse(char *s)
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printf(2, "syntax error: < not followed by word\n");
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return -1;
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}
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addnode('<', t);
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addio('<', t);
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break;
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case '>': // Output redirection
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@ -80,7 +91,13 @@ parse(char *s)
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printf(2, "syntax error: > not followed by word\n");
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return -1;
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}
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addnode('>', t);
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addio('>', t);
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break;
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case ';': // command sequence
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case '|': // pipe
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cmdlist[nextcmd].token = c;
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nextcmd++;
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break;
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case 0: // String is complete
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@ -98,88 +115,127 @@ parse(char *s)
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void
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runcmd(void)
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{
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int i, r, pid;
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int c, i, r, pid, tfd;
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int fdarray[2];
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// Return immediately if command line was empty.
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if(argc == 0) {
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if(cmdlist[0].argc == 0) {
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if (debug)
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printf(2, "EMPTY COMMAND\n");
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return;
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}
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for (c = 0; c <= nextcmd; c++) {
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// Clean up command line.
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// Read all commands from the filesystem: add an initial '/' to
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// the command name.
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// This essentially acts like 'PATH=/'.
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if (argv[0][0] != '/') {
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argv0buf[0] = '/';
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strcpy(argv0buf + 1, argv[0]);
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argv[0] = argv0buf;
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if (cmdlist[c].argv[0][0] != '/') {
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cmdlist[c].argv0buf[0] = '/';
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strcpy(cmdlist[c].argv0buf + 1, cmdlist[c].argv[0]);
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cmdlist[c].argv[0] = cmdlist[c].argv0buf;
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}
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argv[argc] = 0;
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cmdlist[c].argv[cmdlist[c].argc] = 0;
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// Print the command.
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if (debug) {
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printf(2, "[%d] SPAWN:", getpid());
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for (i = 0; argv[i]; i++)
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printf(2, " %s", argv[i]);
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for (i = 0; i < nextnode; i++) {
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printf(2, "%c %s", list[i].token, list[i].s);
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for (i = 0; cmdlist[c].argv[i]; i++)
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printf(2, " %s", cmdlist[c].argv[i]);
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for (i = 0; i < nextio; i++) {
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printf(2, "%c %s", iolist[i].token, iolist[i].s);
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}
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printf(2, "\n");
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}
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if (strcmp(argv[0], "/cd") == 0) {
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if (debug) printf (2, "/cd %s is build in\n", argv[1]);
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chdir(argv[1]);
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if (strcmp(cmdlist[c].argv[0], "/cd") == 0) {
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if (debug) printf (2, "/cd %s is build in\n", cmdlist[c].argv[1]);
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chdir(cmdlist[c].argv[1]);
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return;
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}
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if (cmdlist[c].token == '|')
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if (pipe(fdarray) < 0)
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printf(2, "cmd %d pipe failed\n", c);
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pid = fork();
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if (pid == 0) {
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if (cmdlist[c].token == '|') {
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if (close(1) < 0)
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printf(2, "close 1 failed\n");
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if ((tfd = dup(fdarray[1])) < 0)
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printf(2, "dup failed\n");
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if (close(fdarray[0]) < 0)
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printf(2, "close fdarray[0] failed\n");
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if (close(fdarray[1]) < 0)
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printf(2, "close fdarray[1] failed\n");
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}
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if (c > 0 && cmdlist[c-1].token == '|') {
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if (close(0) < 0)
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printf(2, "close 0 failed\n");
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if ((tfd = dup(fdarray[0])) < 0)
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printf(2, "dup failed\n");
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if (close(fdarray[0]) < 0)
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printf(2, "close fdarray[0] failed\n");
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if (close(fdarray[1]) < 0)
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printf(2, "close fdarray[1] failed\n");
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}
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if (ioredirection() < 0)
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exit();
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if ((r = exec(argv0buf, (char**) argv)) < 0) {
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printf(2, "exec %s: %d\n", argv[0], r);
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if ((r = exec(cmdlist[c].argv0buf, (char**) cmdlist[c].argv)) < 0) {
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printf(2, "exec %s: %d\n", cmdlist[c].argv[0], r);
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exit();
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}
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}
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if (pid > 0) {
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} else if (pid > 0) {
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int p;
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if (debug)
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printf(2, "[%d] WAIT %s\n", getpid(), argv[0]);
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wait();
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printf(2, "[%d] FORKED child %d\n", getpid(), pid);
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if (c > 0 && cmdlist[c-1].token == '|') {
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close(fdarray[0]);
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close(fdarray[1]);
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}
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if (cmdlist[c].token != '|') {
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if (debug)
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printf(2, "[%d] WAIT for children\n", getpid());
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do {
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p = wait();
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if (debug)
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printf(2, "[%d] WAIT child %d finished\n", getpid(), p);
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} while (p > 0);
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if (debug)
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printf(2, "[%d] wait finished\n", getpid());
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}
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}
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}
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}
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int
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ioredirection(void)
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{
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int i, fd, dfd;
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int i, fd;
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for (i = 0; i < nextnode; i++) {
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switch (list[i].token) {
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for (i = 0; i < nextio; i++) {
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switch (iolist[i].token) {
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case '<':
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if (close(0) < 0)
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printf(2, "close 0 failed\n");
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if ((fd = open(list[i].s, O_RDONLY)) < 0) {
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printf(2, "failed to open %s for read: %d", list[i].s, fd);
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if ((fd = open(iolist[i].s, O_RDONLY)) < 0) {
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printf(2, "failed to open %s for read: %d", iolist[i].s, fd);
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return -1;
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}
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if (debug)
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printf(2, "redirect 0 from %s\n", list[i].s);
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printf(2, "redirect 0 from %s\n", iolist[i].s);
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break;
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case '>':
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if (close(1) < 0)
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printf(2, "close 1 failed\n");
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if ((fd = open(list[i].s, O_WRONLY|O_CREATE)) < 0) {
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printf(2, "failed to open %s for write: %d", list[i].s, fd);
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if ((fd = open(iolist[i].s, O_WRONLY|O_CREATE)) < 0) {
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printf(2, "failed to open %s for write: %d", iolist[i].s, fd);
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exit();
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}
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if (debug)
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printf(2, "redirect 1 to %s\n", list[i].s);
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printf(2, "redirect 1 to %s\n", iolist[i].s);
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break;
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}
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}
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@ -187,16 +243,16 @@ ioredirection(void)
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}
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void
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addnode(int token, char *s)
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addio(int token, char *s)
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{
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if (nextnode >= MAXNODE) {
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printf(2, "addnode: ran out of nodes\n");
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if (nextio >= MAXNODE) {
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printf(2, "addio: ran out of nodes\n");
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return;
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}
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list[nextnode].token = token;
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list[nextnode].s = s;
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nextnode++;
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iolist[nextio].token = token;
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iolist[nextio].s = s;
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nextio++;
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}
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