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dahdi_cfg: Wait for all spans to be assigned. 

When auto span assignment is disabled, it's possible that simply running

  # /etc/init.d/dahdi restart

Will fail since dahdi_cfg can run in parallel with udev scripts that are
assigning spans, which results in /etc/dahdi/system.conf describing spans that
do not exist in the system.

This change sets up dahdi_cfg, when run without the -C or -S options, to look in
sysfs and make sure all spans for each device are assigned.  dahdi_cfg will wait
5 seconds for span assignment to happen before proceeding normally.

Signed-off-by: Shaun Ruffell <sruffell@digium.com>
Acked-by: Tzafrir Cohen <tzafrir.cohen@xorcom.com>
Acked-by: Russ Meyerriecks <rmeyerriecks@digium.com>
This commit is contained in:
Shaun Ruffell 2013-12-09 17:19:23 -06:00
parent 98736e1add
commit 5ca600c7c7
1 changed files with 95 additions and 0 deletions
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95
dahdi_cfg.c
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@ -36,6 +36,8 @@
#include <sys/ioctl.h>
#include <fcntl.h>
#include <errno.h>
#include <dirent.h>
#include <stdbool.h>
#include <dahdi/user.h>
#include "tonezone.h"
@ -137,6 +139,84 @@ static const char *laws[] = {
"A-law"
};
static bool _are_all_spans_assigned(const char *device_path)
{
char attribute[1024];
int res;
FILE *fp;
int span_count;
DIR *dirp;
struct dirent *dirent;
snprintf(attribute, sizeof(attribute) - 1,
"%s/span_count", device_path);
fp = fopen(attribute, "r");
if (NULL == fp) {
fprintf(stderr, "Failed to open '%s'.\n", attribute);
return false;
}
res = fscanf(fp, "%d", &span_count);
fclose(fp);
if (EOF == res) {
fprintf(stderr, "Failed to read '%s'.\n", attribute);
return false;
}
dirp = opendir(device_path);
while (span_count) {
dirent = readdir(dirp);
if (NULL == dirent)
break;
if (!strncmp("span-", dirent->d_name, 5)) {
--span_count;
}
}
closedir(dirp);
return (span_count > 0) ? false : true;
}
/**
* are_all_spans_assigned - Look in sysfs to see if all spans for a device are assigned.
*
* Returns true if there are $span_count child spans of all devices, or false
* otherwise.
*/
static bool are_all_spans_assigned(void)
{
DIR *dirp;
struct dirent *dirent;
bool res = true;
char device_path[1024];
dirp = opendir("/sys/bus/dahdi_devices/devices");
if (!dirp) {
/* If we cannot open dahdi_devices, either dahdi isn't loaded,
* or we're using an older version of DAHDI that doesn't use
* sysfs. */
return true;
}
while (true && res) {
dirent = readdir(dirp);
if (NULL == dirent)
break;
if (!strcmp(dirent->d_name, ".") ||
!strcmp(dirent->d_name, ".."))
continue;
snprintf(device_path, sizeof(device_path)-1,
"/sys/bus/dahdi_devices/devices/%s", dirent->d_name);
res = _are_all_spans_assigned(device_path);
}
closedir(dirp);
errno = 0;
return res;
}
static const char *sigtype_to_str(const int sig)
{
switch (sig) {
@ -1495,6 +1575,21 @@ int main(int argc, char *argv[])
fprintf(stderr, "%s\n", dahdi_tools_version);
}
if (!restrict_channels && !only_span) {
bool all_assigned = are_all_spans_assigned();
unsigned int timeout = 4*5; /* We'll wait 5 seconds */
while (!all_assigned && --timeout) {
usleep(250000);
all_assigned = are_all_spans_assigned();
}
if (0 == timeout) {
fprintf(stderr,
"Timeout waiting for all spans to be assigned.\n");
}
}
if (fd == -1) fd = open(MASTER_DEVICE, O_RDWR);
if (fd < 0) {
error("Unable to open master device '%s'\n", MASTER_DEVICE);