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#include <unistd.h> |
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#include <sys/types.h> |
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#include <sys/stat.h> |
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#include <fcntl.h> |
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#include <sys/ioctl.h> |
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#include <sys/vt.h> |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include "builtins.h" |
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#include "shell.h" |
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#include "bashgetopt.h" |
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/* A builtin `xxx' is normally implemented with an `xxx_builtin' function. |
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If you're converting a command that uses the normal Unix argc/argv |
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calling convention, use argv = make_builtin_argv (list, &argc) and call |
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the original `main' something like `xxx_main'. Look at cat.c for an |
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example. |
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Builtins should use internal_getopt to parse options. It is the same as |
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getopt(3), but it takes a WORD_LIST *. Look at print.c for an example |
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of its use. |
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If the builtin takes no options, call no_options(list) before doing |
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anything else. If it returns a non-zero value, your builtin should |
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immediately return EX_USAGE. Look at logname.c for an example. |
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A builtin command returns EXECUTION_SUCCESS for success and |
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EXECUTION_FAILURE to indicate failure. */ |
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console_builtin (list) |
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WORD_LIST *list; |
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{ |
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char *path = list->word->word; |
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int fd = open (path, O_RDWR); |
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unsigned int console; |
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if (fd != -1) |
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{ |
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dup2 (fd, 0); |
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dup2 (fd, 1); |
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dup2 (fd, 2); |
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if (fd > 2) |
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close (fd); |
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if (sscanf (path, "/dev/tty%u%*c", &console) == 1) |
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{ |
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if (console > 0 && console < 64) |
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{ |
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ioctl (0, VT_ACTIVATE, console); |
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ioctl (0, VT_WAITACTIVE, console); |
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} |
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} |
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return EXECUTION_SUCCESS; |
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} |
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else |
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return EXECUTION_FAILURE; |
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} |
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/* An array of strings forming the `long' documentation for a builtin xxx, |
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which is printed by `help xxx'. It must end with a NULL. */ |
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char *console_doc[] = { |
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"connects the current process to 'path'", |
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"no controlling terminal will be allocated", |
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"if the path is of the form /dev/ttyN, switches to that console", |
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(char *)NULL |
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}; |
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/* The standard structure describing a builtin command. bash keeps an array |
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of these structures. The flags must include BUILTIN_ENABLED so the |
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builtin can be used. */ |
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struct builtin console_struct = { |
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"console", /* builtin name */ |
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console_builtin, /* function implementing the builtin */ |
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BUILTIN_ENABLED, /* initial flags for builtin */ |
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console_doc, /* array of long documentation strings. */ |
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"console path", /* usage synopsis; becomes short_doc */ |
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0 /* reserved for internal use */ |
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}; |
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setsid_builtin (list) |
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WORD_LIST *list; |
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{ |
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int fd = open ("/dev/tty", O_RDWR); |
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if (fd != -1) |
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{ |
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ioctl (fd, TIOCNOTTY); |
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close (fd); |
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} |
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return setsid () >= 0 |
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? EXECUTION_SUCCESS |
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: EXECUTION_FAILURE; |
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} |
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char *setsid_doc[] = { |
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"calls setsid", |
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(char *)NULL |
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}; |
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struct builtin setsid_struct = { |
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"setsid", |
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setsid_builtin, |
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BUILTIN_ENABLED, |
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setsid_doc, |
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"setsid", |
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0 |
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}; |
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winsize_builtin (list) |
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WORD_LIST *list; |
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{ |
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struct winsize ws; |
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if (ioctl (0, TIOCGWINSZ, &ws) != -1) |
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{ |
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printf ("rows=%d; cols=%d\n", ws.ws_row, ws.ws_col); |
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return EXECUTION_SUCCESS; |
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} |
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else |
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{ |
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printf ("rows=80; cols=25\n"); |
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return EXECUTION_FAILURE; |
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} |
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} |
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char *winsize_doc[] = { |
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"returns the window size as 'rows=<rows>; cols=<columns>'", |
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(char *)NULL |
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}; |
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struct builtin winsize_struct = { |
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"winsize", |
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winsize_builtin, |
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BUILTIN_ENABLED, |
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winsize_doc, |
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"winsize", |
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0 |
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}; |
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renamefunc_builtin (list) |
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WORD_LIST *list; |
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{ |
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if (list && list->next) |
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{ |
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BUCKET_CONTENTS *elt = (BUCKET_CONTENTS *)hash_remove (list->word->word, shell_functions, 0); |
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if (elt) |
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{ |
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SHELL_VAR *cmd = (SHELL_VAR *)elt->data; |
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free (elt->key); |
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free (elt); |
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free (cmd->name); |
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cmd->name = savestring (list->next->word->word); |
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elt = hash_insert (cmd->name, shell_functions, 0); |
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elt->data = (char *)cmd; |
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return EXECUTION_SUCCESS; |
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} |
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else |
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return EXECUTION_FAILURE; |
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} |
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else |
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return EX_USAGE; |
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} |
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char *renamefunc_doc[] = { |
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"rename a function from oldname to newname. the new function mustn't exist", |
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(char *)NULL |
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}; |
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struct builtin renamefunc_struct = { |
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"renamefunc", |
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renamefunc_builtin, |
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BUILTIN_ENABLED, |
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renamefunc_doc, |
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"renamefunc oldname newname", |
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0 |
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}; |
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usleep_builtin (list) |
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WORD_LIST *list; |
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{ |
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usleep (atof (list->word->word) * 1e6); |
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return EXECUTION_SUCCESS; |
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} |
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char *usleep_doc[] = { |
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"sleep a (possibly fractional) number of seconds", |
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(char *)NULL |
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}; |
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struct builtin usleep_struct = { |
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"usleep", |
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usleep_builtin, |
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BUILTIN_ENABLED, |
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usleep_doc, |
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"usleep time-in-fractional-seconds", |
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0 |
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}; |
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str2hex_builtin (list) |
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WORD_LIST *list; |
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{ |
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char *p; |
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for (p = list->word->word; *p; p++) |
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printf ("%02x", *p); |
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puts ("\n"); |
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return EXECUTION_SUCCESS; |
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} |
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char *str2hex_doc[] = { |
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"convert the first argument to a hex string", |
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(char *)NULL |
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}; |
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struct builtin str2hex_struct = { |
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"str2hex", |
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str2hex_builtin, |
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BUILTIN_ENABLED, |
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str2hex_doc, |
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"str2hex string", |
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0 |
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}; |
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#if 0 |
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havefunc_builtin (list) |
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WORD_LIST *list; |
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{ |
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if(list && find_hash_item(list->word->word, shell_functions)) |
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return EXECUTION_SUCCESS; |
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return EXECUTION_FAILURE; |
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} |
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char *havefunc_doc[] = { |
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"checks if argument is a shell function", |
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(char *)NULL |
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}; |
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struct builtin havefunc_struct = { |
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"havefunc", |
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havefunc_builtin, |
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BUILTIN_ENABLED, |
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havefunc_doc, |
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"havefunc name", |
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0 |
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}; |
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#endif |
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