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fs/vfs/fs_select.c: Make select be more consistent with Linux man page: 'The timeout

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... Some code calls select() with all three sets empty, nfds zero, and a non-NULL timeout as a fairly portable way to sleep with subsecond precision.'
This commit is contained in:
anchao 2018-08-26 13:19:28 -06:00 committed by Gregory Nutt
parent 8530fe0a7c
commit 6361f93fda
1 changed files with 10 additions and 11 deletions
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21
fs/vfs/fs_select.c
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@ -103,7 +103,7 @@
int select(int nfds, FAR fd_set *readfds, FAR fd_set *writefds,
FAR fd_set *exceptfds, FAR struct timeval *timeout)
{
struct pollfd *pollset;
struct pollfd *pollset = NULL;
int errcode = OK;
int fd;
int npfds;
@ -133,19 +133,18 @@ int select(int nfds, FAR fd_set *readfds, FAR fd_set *writefds,
}
}
if (npfds <= 0)
{
errcode = EINVAL;
goto errout;
}
/* Allocate the descriptor list for poll() */
pollset = (struct pollfd *)kmm_zalloc(npfds * sizeof(struct pollfd));
if (!pollset)
if (npfds > 0)
{
errcode = ENOMEM;
goto errout;
pollset = (FAR struct pollfd *)
kmm_zalloc(npfds * sizeof(struct pollfd));
if (pollset == NULL)
{
errcode = ENOMEM;
goto errout;
}
}
/* Initialize the descriptor list for poll() */