50 lines
1.1 KiB
C
50 lines
1.1 KiB
C
|
/* asyn_write() Author: Kees J. Bot
|
||
|
|
* 7 Jul 1997
|
||
|
|
*/
|
||
|
|
#include "asyn.h"
|
||
|
|
#include <signal.h>
|
||
|
|
|
||
|
|
ssize_t asyn_write(asynchio_t *asyn, int fd, const void *buf, size_t len)
|
||
|
|
/* Nonblocking write(). (See asyn_read()). */
|
||
|
|
{
|
||
|
|
asynfd_t *afd;
|
||
|
|
|
||
|
|
asyn->asyn_more++;
|
||
|
|
|
||
|
|
if ((unsigned) fd >= FD_SETSIZE) { errno= EBADF; return -1; }
|
||
|
|
afd= &asyn->asyn_afd[fd];
|
||
|
|
|
||
|
|
if (!afd->afd_seen) {
|
||
|
|
if ((afd->afd_flags= fcntl(fd, F_GETFL)) < 0) return -1;
|
||
|
|
afd->afd_seen= 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (afd->afd_state[SEL_WRITE] == PENDING) {
|
||
|
|
sigset_t mask;
|
||
|
|
ssize_t result;
|
||
|
|
int err;
|
||
|
|
|
||
|
|
sigemptyset(&mask);
|
||
|
|
if (sigprocmask(SIG_SETMASK, &mask, &mask) < 0) return -1;
|
||
|
|
(void) fcntl(fd, F_SETFL, afd->afd_flags | O_NONBLOCK);
|
||
|
|
|
||
|
|
result= write(fd, buf, len);
|
||
|
|
err= errno;
|
||
|
|
|
||
|
|
(void) fcntl(fd, F_SETFL, afd->afd_flags);
|
||
|
|
(void) sigprocmask(SIG_SETMASK, &mask, nil);
|
||
|
|
|
||
|
|
errno= err;
|
||
|
|
if (result != -1 || errno != EAGAIN) {
|
||
|
|
afd->afd_state[SEL_WRITE]= IDLE;
|
||
|
|
return result;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
afd->afd_state[SEL_WRITE]= WAITING;
|
||
|
|
FD_SET(fd, &asyn->asyn_fdset[SEL_WRITE]);
|
||
|
|
errno= EAGAIN;
|
||
|
|
asyn->asyn_more--;
|
||
|
|
return -1;
|
||
|
|
}
|