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