linux-4.4.1/do_sys_poll()
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開始行:
*参照元 [#bbe269fe]
#backlinks
*説明 [#ae42a17c]
-パス: [[linux-4.4.1/fs/select.c]]
-FIXME: これは何？
--説明
**引数 [#e9cc0de8]
-struct pollfd __user *ufds
--
--[[linux-4.4.1/pollfd]]
-unsigned int nfds
--
-struct timespec *end_time
--
--[[linux-4.4.1/timespec]]
**返り値 [#p0149fe4]
-int
--
**参考 [#e8c52795]
*実装 [#e45b950b]
int do_sys_poll(struct pollfd __user *ufds, unsigned int...
struct timespec *end_time)
{
struct poll_wqueues table;
int err = -EFAULT, fdcount, len, size;
/* Allocate small arguments on the stack to save memory...
faster - use long to make sure the buffer is aligned...
on 64 bit archs to avoid unaligned access */
long stack_pps[POLL_STACK_ALLOC/sizeof(long)];
struct poll_list *const head = (struct poll_list *)stac...
struct poll_list *walk = head;
unsigned long todo = nfds;
-
--[[linux-4.4.1/poll_wqueues]]
--[[linux-4.4.1/POLL_STACK_ALLOC]]
--[[linux-4.4.1/poll_list]]
if (nfds > rlimit(RLIMIT_NOFILE))
return -EINVAL;
-
--[[linux-4.4.1/rlimit()]]
len = min_t(unsigned int, nfds, N_STACK_PPS);
-
--[[linux-4.4.1/min_t()]]
for (;;) {
walk->next = NULL;
walk->len = len;
if (!len)
break;
if (copy_from_user(walk->entries, ufds + nfds-todo,
sizeof(struct pollfd) * walk->len))
goto out_fds;
-
--[[linux-4.4.1/copy_from_user()]]
todo -= walk->len;
if (!todo)
break;
len = min(todo, POLLFD_PER_PAGE);
size = sizeof(struct poll_list) + sizeof(struct pollfd...
walk = walk->next = kmalloc(size, GFP_KERNEL);
if (!walk) {
err = -ENOMEM;
goto out_fds;
}
-
--[[linux-4.4.1/kmalloc()]]
}
poll_initwait(&table);
fdcount = do_poll(nfds, head, &table, end_time);
poll_freewait(&table);
-
--[[linux-4.4.1/poll_initwait()]]
--[[linux-4.4.1/do_poll()]]
--[[linux-4.4.1/poll_freewait()]]
for (walk = head; walk; walk = walk->next) {
struct pollfd *fds = walk->entries;
int j;
for (j = 0; j < walk->len; j++, ufds++)
if (__put_user(fds[j].revents, &ufds->revents))
goto out_fds;
}
-
--[[linux-4.4.1/pollfd]]
--[[linux-4.4.1/__put_user()]]
err = fdcount;
out_fds:
walk = head->next;
while (walk) {
struct poll_list *pos = walk;
walk = walk->next;
kfree(pos);
}
-
--[[linux-4.4.1/kfree()]]
return err;
}
*コメント [#u2b590ef]
終了行:
*参照元 [#bbe269fe]
#backlinks
*説明 [#ae42a17c]
-パス: [[linux-4.4.1/fs/select.c]]
-FIXME: これは何？
--説明
**引数 [#e9cc0de8]
-struct pollfd __user *ufds
--
--[[linux-4.4.1/pollfd]]
-unsigned int nfds
--
-struct timespec *end_time
--
--[[linux-4.4.1/timespec]]
**返り値 [#p0149fe4]
-int
--
**参考 [#e8c52795]
*実装 [#e45b950b]
int do_sys_poll(struct pollfd __user *ufds, unsigned int...
struct timespec *end_time)
{
struct poll_wqueues table;
int err = -EFAULT, fdcount, len, size;
/* Allocate small arguments on the stack to save memory...
faster - use long to make sure the buffer is aligned...
on 64 bit archs to avoid unaligned access */
long stack_pps[POLL_STACK_ALLOC/sizeof(long)];
struct poll_list *const head = (struct poll_list *)stac...
struct poll_list *walk = head;
unsigned long todo = nfds;
-
--[[linux-4.4.1/poll_wqueues]]
--[[linux-4.4.1/POLL_STACK_ALLOC]]
--[[linux-4.4.1/poll_list]]
if (nfds > rlimit(RLIMIT_NOFILE))
return -EINVAL;
-
--[[linux-4.4.1/rlimit()]]
len = min_t(unsigned int, nfds, N_STACK_PPS);
-
--[[linux-4.4.1/min_t()]]
for (;;) {
walk->next = NULL;
walk->len = len;
if (!len)
break;
if (copy_from_user(walk->entries, ufds + nfds-todo,
sizeof(struct pollfd) * walk->len))
goto out_fds;
-
--[[linux-4.4.1/copy_from_user()]]
todo -= walk->len;
if (!todo)
break;
len = min(todo, POLLFD_PER_PAGE);
size = sizeof(struct poll_list) + sizeof(struct pollfd...
walk = walk->next = kmalloc(size, GFP_KERNEL);
if (!walk) {
err = -ENOMEM;
goto out_fds;
}
-
--[[linux-4.4.1/kmalloc()]]
}
poll_initwait(&table);
fdcount = do_poll(nfds, head, &table, end_time);
poll_freewait(&table);
-
--[[linux-4.4.1/poll_initwait()]]
--[[linux-4.4.1/do_poll()]]
--[[linux-4.4.1/poll_freewait()]]
for (walk = head; walk; walk = walk->next) {
struct pollfd *fds = walk->entries;
int j;
for (j = 0; j < walk->len; j++, ufds++)
if (__put_user(fds[j].revents, &ufds->revents))
goto out_fds;
}
-
--[[linux-4.4.1/pollfd]]
--[[linux-4.4.1/__put_user()]]
err = fdcount;
out_fds:
walk = head->next;
while (walk) {
struct poll_list *pos = walk;
walk = walk->next;
kfree(pos);
}
-
--[[linux-4.4.1/kfree()]]
return err;
}
*コメント [#u2b590ef]
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