* file named AUTHORS, in the root directory of this distribution.
*/
/*
- * $Id: changer.c,v 1.36.2.2 2007/01/25 19:47:37 martinea Exp $
+ * $Id: changer.c,v 1.36 2006/08/24 01:57:16 paddy_s Exp $
*
* interface routines for tape changers
*/
int changer_debug = 0;
char *changer_resultstr = NULL;
-static char *tapechanger = NULL;
+static pid_t tpchanger_pid = -1;
+static int tpchanger_stdout = -1;
+static int tpchanger_stdin = -1;
/* local functions */
static int changer_command(char *cmd, char *arg);
-static int report_bad_resultstr(void);
+static int report_bad_resultstr(char *cmd);
static int run_changer_command(char *cmd, char *arg, char **slotstr, char **rest);
int
changer_init(void)
{
- tapechanger = getconf_str(CNF_TPCHANGER);
- return strcmp(tapechanger, "") != 0;
+ return strcmp(getconf_str(CNF_TPCHANGER), "") != 0;
}
static int
-report_bad_resultstr(void)
+report_bad_resultstr(char *cmd)
{
char *s;
- s = vstralloc("badly formed result from changer: ",
- "\"", changer_resultstr, "\"",
- NULL);
+ s = vstrallocf(_("<error> badly formed result from changer command %s: \"%s\""),
+ cmd, changer_resultstr);
amfree(changer_resultstr);
changer_resultstr = s;
return 2;
ch = *s++;
skip_whitespace(s, ch);
- if(ch == '\0') return report_bad_resultstr();
+ if(ch == '\0') return report_bad_resultstr(cmd);
slot = s - 1;
skip_non_whitespace(s, ch);
s[-1] = '\0';
}
if(exitcode) {
- if(ch == '\0') return report_bad_resultstr();
+ if(ch == '\0') return report_bad_resultstr(cmd);
result_copy = stralloc(s - 1);
amfree(changer_resultstr);
changer_resultstr = result_copy;
rc = run_changer_command("-slot", inslotstr, outslotstr, &rest);
if(rc) return rc;
- if(*rest == '\0') return report_bad_resultstr();
+ if(*rest == '\0') return report_bad_resultstr("-slot");
*devicename = newstralloc(*devicename, rest);
return 0;
rc = run_changer_command("-info", (char *) NULL, curslotstr, &rest);
if(rc) return rc;
- dbprintf(("changer_query: changer return was %s\n",rest));
+ dbprintf(_("changer_query: changer return was %s\n"),rest);
if (sscanf(rest, "%d %d %d", nslotsp, backwardsp, searchable) != 3) {
if (sscanf(rest, "%d %d", nslotsp, backwardsp) != 2) {
- return report_bad_resultstr();
+ return report_bad_resultstr("-info");
} else {
*searchable = 0;
}
}
- dbprintf(("changer_query: searchable = %d\n",*searchable));
+ dbprintf(_("changer_query: searchable = %d\n"),*searchable);
return 0;
}
if(rc) return rc;
if (sscanf(rest, "%d %d", nslotsp, backwardsp) != 2) {
- return report_bad_resultstr();
+ return report_bad_resultstr("-info");
}
return 0;
}
if (rc != 0) {
/* Problem with the changer script. Bail. */
- fprintf(stderr, "Changer problem: %s\n", changer_resultstr);
+ g_fprintf(stderr, _("Changer problem: %s\n"), changer_resultstr);
+ amfree(curslotstr);
return;
}
if (searchlabel != NULL)
{
- dbprintf(("changer_find: looking for %s changer is searchable = %d\n",
- searchlabel, searchable));
+ dbprintf(_("changer_find: looking for %s changer is searchable = %d\n"),
+ searchlabel, searchable);
} else {
- dbprintf(("changer_find: looking for NULL changer is searchable = %d\n",
- searchable));
+ dbprintf(_("changer_find: looking for NULL changer is searchable = %d\n"),
+ searchable);
}
if ((searchlabel!=NULL) && searchable && !done){
/* ---------------------------- */
static int
-changer_command(
- char *cmd,
- char *arg)
+start_chg_glue(void)
{
- int fd[2];
- amwait_t wait_exitcode = 1;
- int exitcode;
- char num1[NUM_STR_SIZE];
- char num2[NUM_STR_SIZE];
- char *cmdstr;
- pid_t pid, changer_pid = 0;
- int fd_to_close[4], *pfd_to_close = fd_to_close;
-
- if (*tapechanger != '/') {
- tapechanger = vstralloc(libexecdir, "/", tapechanger, versionsuffix(),
- NULL);
- malloc_mark(tapechanger);
+ int stdin_pipe[2] = { -1, -1 };
+ int stdout_pipe[2] = { -1, -1 };
+ char *chg_glue;
+
+ /* is it already running? */
+ if (tpchanger_pid != -1)
+ return 1;
+
+ if (pipe(stdin_pipe) == -1 || pipe(stdout_pipe) == -1) {
+ changer_resultstr = vstrallocf(
+ _("<error> could not make pipe: %s"), strerror(errno));
+ goto error;
}
- cmdstr = vstralloc(tapechanger, " ",
- cmd, arg ? " " : "",
- arg ? arg : "",
- NULL);
- if(changer_debug) {
- fprintf(stderr, "changer: opening pipe to: %s\n", cmdstr);
- fflush(stderr);
+ switch(tpchanger_pid = fork()) {
+ case -1:
+ changer_resultstr = vstrallocf(
+ _("<error> could not fork: %s"), strerror(errno));
+ goto error;
+
+ case 0:
+ debug_dup_stderr_to_debug();
+ if(dup2(stdin_pipe[0], 0) == -1) {
+ changer_resultstr = vstrallocf(
+ _("<error> could not dup2: %s"), strerror(errno));
+ goto child_err;
+ }
+
+ if(dup2(stdout_pipe[1], 1) == -1) {
+ changer_resultstr = vstrallocf(
+ _("<error> could not dup2: %s"), strerror(errno));
+ goto child_err;
+ }
+ safe_fd(-1, 0);
+
+ chg_glue = g_strdup_printf("%s/chg-glue", amlibexecdir);
+
+ execl(chg_glue, chg_glue, get_config_name(), NULL);
+ changer_resultstr = vstrallocf(
+ _("<error> could not exec \"chg-glue\": %s"), strerror(errno));
+ goto child_err;
+
+child_err:
+ (void)full_write(stdout_pipe[1], changer_resultstr, strlen(changer_resultstr));
+ exit(1);
+
+ default:
+ aclose(stdin_pipe[0]);
+ aclose(stdout_pipe[1]);
+
+ tpchanger_stdout = stdout_pipe[0];
+ tpchanger_stdin = stdin_pipe[1];
+
+ return 1;
}
+error:
+ aclose(stdin_pipe[0]);
+ aclose(stdin_pipe[1]);
+ aclose(stdout_pipe[0]);
+ aclose(stdout_pipe[1]);
+
+ return 0;
+}
+
+static int
+changer_command(
+ char *cmd,
+ char *arg)
+{
+ int exitcode = 0;
+ char *cmdstr = NULL;
+
amfree(changer_resultstr);
- if(socketpair(AF_UNIX, SOCK_STREAM, 0, fd) == -1) {
- changer_resultstr = vstralloc ("<error> ",
- "could not create pipe for \"",
- cmdstr,
- "\": ",
- strerror(errno),
- NULL);
+ if (!start_chg_glue()) {
exitcode = 2;
goto failed;
}
- /* make sure fd[0] > 2 && fd[1] > 2 */
- pfd_to_close = fd_to_close;
- while(fd[0] <= 2) {
- int a = dup(fd[0]);
- *pfd_to_close++ = fd[0];
- fd[0] = a;
- }
- while(fd[1] <= 2) {
- int a = dup(fd[1]);
- *pfd_to_close++ = fd[1];
- fd[1] = a;
- }
- while (pfd_to_close > fd_to_close) {
- close(*--pfd_to_close);
- }
+ cmdstr = vstralloc(cmd,
+ arg ? " " : "",
+ arg ? arg : "",
+ "\n",
+ NULL);
- if(fd[0] < 0 || fd[0] >= (int)FD_SETSIZE) {
- snprintf(num1, SIZEOF(num1), "%d", fd[0]);
- snprintf(num2, SIZEOF(num2), "%d", FD_SETSIZE-1);
- changer_resultstr = vstralloc ("<error> ",
- "could not create pipe for \"",
- cmdstr,
- "\": ",
- "socketpair 0: descriptor ",
- num1,
- " out of range ( .. ",
- num2,
- ")",
- NULL);
- exitcode = 2;
- goto done;
- }
- if(fd[1] < 0 || fd[1] >= (int)FD_SETSIZE) {
- snprintf(num1, SIZEOF(num1), "%d", fd[1]);
- snprintf(num2, SIZEOF(num2), "%d", FD_SETSIZE-1);
- changer_resultstr = vstralloc ("<error> ",
- "could not create pipe for \"",
- cmdstr,
- "\": ",
- "socketpair 1: descriptor ",
- num1,
- " out of range ( .. ",
- num2,
- ")",
- NULL);
- exitcode = 2;
- goto done;
- }
+ g_debug("changer: >> %s %s", cmd, arg? arg : "");
- switch(changer_pid = fork()) {
- case -1:
- changer_resultstr = vstralloc ("<error> ",
- "could not fork for \"",
- cmdstr,
- "\": ",
- strerror(errno),
- NULL);
+ /* write the command to chg_glue */
+ if (full_write(tpchanger_stdin, cmdstr, strlen(cmdstr)) != strlen(cmdstr)) {
+ changer_resultstr = g_strdup("<error> chg-glue exited unexpectedly");
exitcode = 2;
- goto done;
- case 0:
- if(dup2(fd[1], 1) == -1 || dup2(dbfd(), 2) == -1) {
- changer_resultstr = vstralloc ("<error> ",
- "could not open pipe to \"",
- cmdstr,
- "\": ",
- strerror(errno),
- NULL);
- (void)fullwrite(fd[1], changer_resultstr, strlen(changer_resultstr));
- exit(1);
- }
- aclose(fd[0]);
- aclose(fd[1]);
- if(config_dir && chdir(config_dir) == -1) {
- changer_resultstr = vstralloc ("<error> ",
- "could not cd to \"",
- config_dir,
- "\": ",
- strerror(errno),
- NULL);
- (void)fullwrite(2, changer_resultstr, strlen(changer_resultstr));
- exit(1);
- }
- if(arg) {
- execle(tapechanger, tapechanger, cmd, arg, (char *)NULL,
- safe_env());
- } else {
- execle(tapechanger, tapechanger, cmd, (char *)NULL, safe_env());
- }
- changer_resultstr = vstralloc ("<error> ",
- "could not exec \"",
- tapechanger,
- "\": ",
- strerror(errno),
- NULL);
- (void)fullwrite(2, changer_resultstr, strlen(changer_resultstr));
- exit(1);
- default:
- aclose(fd[1]);
- }
-
- if((changer_resultstr = areads(fd[0])) == NULL) {
- changer_resultstr = vstralloc ("<error> ",
- "could not read result from \"",
- tapechanger,
- errno ? "\": " : "\"",
- errno ? strerror(errno) : "",
- NULL);
+ goto failed;
}
- while(1) {
- if ((pid = wait(&wait_exitcode)) == -1) {
- if(errno == EINTR) {
- continue;
- } else {
- changer_resultstr = vstralloc ("<error> ",
- "wait for \"",
- tapechanger,
- "\" failed: ",
- strerror(errno),
- NULL);
- exitcode = 2;
- goto done;
- }
- } else if (pid != changer_pid) {
- snprintf(num1, SIZEOF(num1), "%ld", (long)pid);
- changer_resultstr = vstralloc ("<error> ",
- "wait for \"",
- tapechanger,
- "\" returned unexpected pid ",
- num1,
- NULL);
- exitcode = 2;
- goto done;
- } else {
- break;
- }
+ /* read the first line of the response */
+ changer_resultstr = areads(tpchanger_stdout);
+ if (!changer_resultstr || !*changer_resultstr) {
+ changer_resultstr = g_strdup("<error> unexpected EOF");
+ exitcode = 2;
+ goto failed;
}
+ g_debug("changer: << %s", changer_resultstr);
- /* mark out-of-control changers as fatal error */
- if(WIFSIGNALED(wait_exitcode)) {
- snprintf(num1, SIZEOF(num1), "%d", WTERMSIG(wait_exitcode));
- changer_resultstr = newvstralloc (changer_resultstr,
- "<error> ",
- changer_resultstr,
- " (got signal ", num1, ")",
- NULL);
+ if (strncmp_const(changer_resultstr, "EXITSTATUS ") != 0) {
+ report_bad_resultstr(cmd);
exitcode = 2;
- } else {
- exitcode = WEXITSTATUS(wait_exitcode);
+ goto failed;
}
-
-done:
- aclose(fd[0]);
- aclose(fd[1]);
+ exitcode = atoi(changer_resultstr + strlen("EXITSTATUS "));
+
+ /* and the second */
+ changer_resultstr = areads(tpchanger_stdout);
+ if (!changer_resultstr) {
+ changer_resultstr = g_strdup("<error> unexpected EOF");
+ exitcode = 2;
+ goto failed;
+ }
+ g_debug("changer: << %s", changer_resultstr);
failed:
if (exitcode != 0) {
- dbprintf(("changer: got exit: %d str: %s\n", exitcode, changer_resultstr));
+ g_debug("changer: ERROR %s", changer_resultstr);
}
amfree(cmdstr);
char *rest;
int rc;
- dbprintf(("changer_search: %s\n",searchlabel));
+ dbprintf("changer_search: %s\n",searchlabel);
rc = run_changer_command("-search", searchlabel, outslotstr, &rest);
if(rc) return rc;
- if(*rest == '\0') return report_bad_resultstr();
+ if(*rest == '\0') return report_bad_resultstr("-search");
*devicename = newstralloc(*devicename, rest);
return 0;
char *curslotstr = NULL;
int nslots, backwards, searchable;
- dbprintf(("changer_label: %s for slot %s\n",labelstr,slotsp));
+ dbprintf(_("changer_label: %s for slot %s\n"),labelstr,slotsp);
rc = changer_query(&nslots, &curslotstr, &backwards,&searchable);
amfree(curslotstr);
if ((rc == 0) && (searchable == 1)){
- dbprintf(("changer_label: calling changer -label %s\n",labelstr));
+ dbprintf(_("changer_label: calling changer -label %s\n"),labelstr);
rc = run_changer_command("-label", labelstr, &slotstr, &rest);
amfree(slotstr);
}
projects / debian / amanda / blobdiff