115 lines
3.0 KiB
C
115 lines
3.0 KiB
C
// Copyright 2010-2018 Nicholas J. Kain <njkain at gmail dot com>
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// SPDX-License-Identifier: MIT
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#include <unistd.h>
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#include <sys/types.h>
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#include <errno.h>
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#include "nk/io.h"
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#include <limits.h>
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// POSIX says read/write/etc() with len param > SSIZE_MAX is implementation defined.
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// So we avoid implementation-defined behavior with the bounding in each safe_* fn.
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/* returns -1 on error, >= 0 and equal to # chars read on success */
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ssize_t safe_read(int fd, char *buf, size_t len)
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{
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size_t s = 0;
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if (len > SSIZE_MAX) len = SSIZE_MAX;
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while (s < len) {
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ssize_t r = read(fd, buf + s, len - s);
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if (r == 0)
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break;
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if (r < 0) {
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if (errno == EINTR)
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continue;
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else if ((errno == EAGAIN || errno == EWOULDBLOCK) && s > 0)
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return (ssize_t)s;
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else
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return -1;
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}
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s += (size_t)r;
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}
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return (ssize_t)s;
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}
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/* returns -1 on error, >= 0 and equal to # chars written on success */
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ssize_t safe_write(int fd, const char *buf, size_t len)
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{
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size_t s = 0;
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if (len > SSIZE_MAX) len = SSIZE_MAX;
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while (s < len) {
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ssize_t r = write(fd, buf + s, len - s);
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if (r < 0) {
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if (errno == EINTR)
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continue;
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else if ((errno == EAGAIN || errno == EWOULDBLOCK) && s > 0)
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return (ssize_t)s;
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else
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return -1;
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}
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s += (size_t)r;
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}
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return (ssize_t)s;
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}
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/* returns -1 on error, >= 0 and equal to # chars written on success */
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ssize_t safe_sendto(int fd, const char *buf, size_t len, int flags,
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const struct sockaddr *dest_addr, socklen_t addrlen)
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{
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size_t s = 0;
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if (len > SSIZE_MAX) len = SSIZE_MAX;
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while (s < len) {
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ssize_t r = sendto(fd, buf + s, len - s, flags, dest_addr, addrlen);
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if (r < 0) {
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if (errno == EINTR)
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continue;
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else if ((errno == EAGAIN || errno == EWOULDBLOCK) && s > 0)
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return (ssize_t)s;
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else
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return -1;
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}
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s += (size_t)r;
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}
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return (ssize_t)s;
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}
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ssize_t safe_recv(int fd, char *buf, size_t len, int flags)
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{
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size_t s = 0;
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if (len > SSIZE_MAX) len = SSIZE_MAX;
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while (s < len) {
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ssize_t r = recv(fd, buf + s, len - s, flags);
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if (r == 0)
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break;
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if (r < 0) {
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if (errno == EINTR)
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continue;
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else if ((errno == EAGAIN || errno == EWOULDBLOCK) && s > 0)
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return (ssize_t)s;
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else
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return -1;
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}
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s += (size_t)r;
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}
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return (ssize_t)s;
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}
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ssize_t safe_recvmsg(int fd, struct msghdr *msg, int flags)
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{
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ssize_t r;
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for (;;) {
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r = recvmsg(fd, msg, flags);
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if (r >= 0 || errno != EINTR) break;
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}
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return r;
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}
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int safe_ftruncate(int fd, off_t length)
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{
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int r;
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for (;;) {
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r = ftruncate(fd, length);
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if (!r || errno != EINTR) break;
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}
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return r;
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}
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