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[lwp]添加select系统调用

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This commit is contained in:
heyuanjie
2018-08-12 20:26:16 +08:00
parent 68edd04cbb
commit fd209cb880
2 changed files with 21 additions and 4 deletions
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components/dfs/src/select.c
+16 -3
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@@ -28,6 +28,19 @@
#include <dfs_poll.h>
#include <dfs_select.h>
static void fdzero(fd_set *set, int nfds)
{
fd_mask *m;
int n;
m = (fd_mask*)set;
for (n = 0; n < nfds; n += sizeof(fd_mask))
{
rt_memset(m, 0, sizeof(fd_mask));
m ++;
}
}
int select(int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds, struct timeval *timeout)
{
int fd;
@@ -113,17 +126,17 @@ int select(int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds, struc
/* Now set up the return values */
if (readfds)
{
memset(readfds, 0, sizeof(fd_set));
fdzero(readfds, nfds);
}
if (writefds)
{
memset(writefds, 0, sizeof(fd_set));
fdzero(writefds, nfds);
}
if (exceptfds)
{
memset(exceptfds, 0, sizeof(fd_set));
fdzero(exceptfds, nfds);
}
/* Convert the poll descriptor list back into selects 3 bitsets */