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os_calls: Add g_get_open_fds()

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This commit is contained in:
matt335672 2023-04-17 20:02:59 +01:00
parent b811fdb36b
commit d712f3527a
2 changed files with 63 additions and 0 deletions
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53
common/os_calls.c
View File

@ -2292,6 +2292,59 @@ g_file_set_cloexec(int fd, int status)
return rv;
}
/*****************************************************************************/
struct list *
g_get_open_fds(int min, int max)
{
struct list *result = list_create();
if (result != NULL)
{
if (max < 0)
{
max = sysconf(_SC_OPEN_MAX);
}
if (max > min)
{
struct pollfd *fds = g_new0(struct pollfd, max - min);
int i;
if (fds == NULL)
{
goto nomem;
}
for (i = min ; i < max ; ++i)
{
fds[i - min].fd = i;
}
if (poll(fds, max - min, 0) >= 0)
{
for (i = min ; i < max ; ++i)
{
if (fds[i - min].revents != POLLNVAL)
{
// Descriptor is open
if (!list_add_item(result, i))
{
goto nomem;
}
}
}
}
g_free(fds);
}
}
return result;
nomem:
list_delete(result);
return NULL;
}
/*****************************************************************************/
/* Converts a hex mask to a mode_t value */
#if !defined(_WIN32)

10
common/os_calls.h
View File

@ -217,6 +217,16 @@ int g_file_lock(int fd, int start, int len);
int g_file_duplicate_on(int fd, int target_fd);
int g_file_get_cloexec(int fd);
int g_file_set_cloexec(int fd, int status);
/**
* Get a list of open file descriptors
*
* @param min Min FD to consider
* @param max Max FD to consider (+1), or -1 for no limit
* @result Array of file descriptors, in ascending order.
*
* Call delete_list() on the result when you've finished with it.
*/
struct list *g_get_open_fds(int min, int max);
int g_chmod_hex(const char *filename, int flags);
int g_umask_hex(int flags);
int g_chown(const char *name, int uid, int gid);