/* * Simple C functions to supplement the C library * * Copyright (c) 2006 Fabrice Bellard * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ #include "qemu-common.h" #include "host-utils.h" #include <math.h> #include "qemu_socket.h" void pstrcpy(char *buf, int buf_size, const char *str) { int c; char *q = buf; if (buf_size <= 0) return; for(;;) { c = *str++; if (c == 0 || q >= buf + buf_size - 1) break; *q++ = c; } *q = '\0'; } /* strcat and truncate. */ char *pstrcat(char *buf, int buf_size, const char *s) { int len; len = strlen(buf); if (len < buf_size) pstrcpy(buf + len, buf_size - len, s); return buf; } int strstart(const char *str, const char *val, const char **ptr) { const char *p, *q; p = str; q = val; while (*q != '\0') { if (*p != *q) return 0; p++; q++; } if (ptr) *ptr = p; return 1; } int stristart(const char *str, const char *val, const char **ptr) { const char *p, *q; p = str; q = val; while (*q != '\0') { if (qemu_toupper(*p) != qemu_toupper(*q)) return 0; p++; q++; } if (ptr) *ptr = p; return 1; } /* XXX: use host strnlen if available ? */ int qemu_strnlen(const char *s, int max_len) { int i; for(i = 0; i < max_len; i++) { if (s[i] == '\0') { break; } } return i; } time_t mktimegm(struct tm *tm) { time_t t; int y = tm->tm_year + 1900, m = tm->tm_mon + 1, d = tm->tm_mday; if (m < 3) { m += 12; y--; } t = 86400 * (d + (153 * m - 457) / 5 + 365 * y + y / 4 - y / 100 + y / 400 - 719469); t += 3600 * tm->tm_hour + 60 * tm->tm_min + tm->tm_sec; return t; } int qemu_fls(int i) { return 32 - clz32(i); } /* * Make sure data goes on disk, but if possible do not bother to * write out the inode just for timestamp updates. * * Unfortunately even in 2009 many operating systems do not support * fdatasync and have to fall back to fsync. */ int qemu_fdatasync(int fd) { #ifdef CONFIG_FDATASYNC return fdatasync(fd); #else return fsync(fd); #endif } /* io vectors */ void qemu_iovec_init(QEMUIOVector *qiov, int alloc_hint) { qiov->iov = g_malloc(alloc_hint * sizeof(struct iovec)); qiov->niov = 0; qiov->nalloc = alloc_hint; qiov->size = 0; } void qemu_iovec_init_external(QEMUIOVector *qiov, struct iovec *iov, int niov) { int i; qiov->iov = iov; qiov->niov = niov; qiov->nalloc = -1; qiov->size = 0; for (i = 0; i < niov; i++) qiov->size += iov[i].iov_len; } void qemu_iovec_add(QEMUIOVector *qiov, void *base, size_t len) { assert(qiov->nalloc != -1); if (qiov->niov == qiov->nalloc) { qiov->nalloc = 2 * qiov->nalloc + 1; qiov->iov = g_realloc(qiov->iov, qiov->nalloc * sizeof(struct iovec)); } qiov->iov[qiov->niov].iov_base = base; qiov->iov[qiov->niov].iov_len = len; qiov->size += len; ++qiov->niov; } /* * Copies iovecs from src to the end of dst. It starts copying after skipping * the given number of bytes in src and copies until src is completely copied * or the total size of the copied iovec reaches size.The size of the last * copied iovec is changed in order to fit the specified total size if it isn't * a perfect fit already. */ void qemu_iovec_copy(QEMUIOVector *dst, QEMUIOVector *src, uint64_t skip, size_t size) { int i; size_t done; void *iov_base; uint64_t iov_len; assert(dst->nalloc != -1); done = 0; for (i = 0; (i < src->niov) && (done != size); i++) { if (skip >= src->iov[i].iov_len) { /* Skip the whole iov */ skip -= src->iov[i].iov_len; continue; } else { /* Skip only part (or nothing) of the iov */ iov_base = (uint8_t*) src->iov[i].iov_base + skip; iov_len = src->iov[i].iov_len - skip; skip = 0; } if (done + iov_len > size) { qemu_iovec_add(dst, iov_base, size - done); break; } else { qemu_iovec_add(dst, iov_base, iov_len); } done += iov_len; } } void qemu_iovec_concat(QEMUIOVector *dst, QEMUIOVector *src, size_t size) { qemu_iovec_copy(dst, src, 0, size); } void qemu_iovec_destroy(QEMUIOVector *qiov) { assert(qiov->nalloc != -1); qemu_iovec_reset(qiov); g_free(qiov->iov); qiov->nalloc = 0; qiov->iov = NULL; } void qemu_iovec_reset(QEMUIOVector *qiov) { assert(qiov->nalloc != -1); qiov->niov = 0; qiov->size = 0; } void qemu_iovec_to_buffer(QEMUIOVector *qiov, void *buf) { uint8_t *p = (uint8_t *)buf; int i; for (i = 0; i < qiov->niov; ++i) { memcpy(p, qiov->iov[i].iov_base, qiov->iov[i].iov_len); p += qiov->iov[i].iov_len; } } void qemu_iovec_from_buffer(QEMUIOVector *qiov, const void *buf, size_t count) { const uint8_t *p = (const uint8_t *)buf; size_t copy; int i; for (i = 0; i < qiov->niov && count; ++i) { copy = count; if (copy > qiov->iov[i].iov_len) copy = qiov->iov[i].iov_len; memcpy(qiov->iov[i].iov_base, p, copy); p += copy; count -= copy; } } void qemu_iovec_memset(QEMUIOVector *qiov, int c, size_t count) { size_t n; int i; for (i = 0; i < qiov->niov && count; ++i) { n = MIN(count, qiov->iov[i].iov_len); memset(qiov->iov[i].iov_base, c, n); count -= n; } } void qemu_iovec_memset_skip(QEMUIOVector *qiov, int c, size_t count, size_t skip) { int i; size_t done; void *iov_base; uint64_t iov_len; done = 0; for (i = 0; (i < qiov->niov) && (done != count); i++) { if (skip >= qiov->iov[i].iov_len) { /* Skip the whole iov */ skip -= qiov->iov[i].iov_len; continue; } else { /* Skip only part (or nothing) of the iov */ iov_base = (uint8_t*) qiov->iov[i].iov_base + skip; iov_len = qiov->iov[i].iov_len - skip; skip = 0; } if (done + iov_len > count) { memset(iov_base, c, count - done); break; } else { memset(iov_base, c, iov_len); } done += iov_len; } } /* * Checks if a buffer is all zeroes * * Attention! The len must be a multiple of 4 * sizeof(long) due to * restriction of optimizations in this function. */ bool buffer_is_zero(const void *buf, size_t len) { /* * Use long as the biggest available internal data type that fits into the * CPU register and unroll the loop to smooth out the effect of memory * latency. */ size_t i; long d0, d1, d2, d3; const long * const data = buf; assert(len % (4 * sizeof(long)) == 0); len /= sizeof(long); for (i = 0; i < len; i += 4) { d0 = data[i + 0]; d1 = data[i + 1]; d2 = data[i + 2]; d3 = data[i + 3]; if (d0 || d1 || d2 || d3) { return false; } } return true; } #ifndef _WIN32 /* Sets a specific flag */ int fcntl_setfl(int fd, int flag) { int flags; flags = fcntl(fd, F_GETFL); if (flags == -1) return -errno; if (fcntl(fd, F_SETFL, flags | flag) == -1) return -errno; return 0; } #endif static int64_t suffix_mul(char suffix, int64_t unit) { switch (qemu_toupper(suffix)) { case STRTOSZ_DEFSUFFIX_B: return 1; case STRTOSZ_DEFSUFFIX_KB: return unit; case STRTOSZ_DEFSUFFIX_MB: return unit * unit; case STRTOSZ_DEFSUFFIX_GB: return unit * unit * unit; case STRTOSZ_DEFSUFFIX_TB: return unit * unit * unit * unit; } return -1; } /* * Convert string to bytes, allowing either B/b for bytes, K/k for KB, * M/m for MB, G/g for GB or T/t for TB. End pointer will be returned * in *end, if not NULL. Return -1 on error. */ int64_t strtosz_suffix_unit(const char *nptr, char **end, const char default_suffix, int64_t unit) { int64_t retval = -1; char *endptr; unsigned char c; int mul_required = 0; double val, mul, integral, fraction; errno = 0; val = strtod(nptr, &endptr); if (isnan(val) || endptr == nptr || errno != 0) { goto fail; } fraction = modf(val, &integral); if (fraction != 0) { mul_required = 1; } c = *endptr; mul = suffix_mul(c, unit); if (mul >= 0) { endptr++; } else { mul = suffix_mul(default_suffix, unit); assert(mul >= 0); } if (mul == 1 && mul_required) { goto fail; } if ((val * mul >= INT64_MAX) || val < 0) { goto fail; } retval = val * mul; fail: if (end) { *end = endptr; } return retval; } int64_t strtosz_suffix(const char *nptr, char **end, const char default_suffix) { return strtosz_suffix_unit(nptr, end, default_suffix, 1024); } int64_t strtosz(const char *nptr, char **end) { return strtosz_suffix(nptr, end, STRTOSZ_DEFSUFFIX_MB); } int qemu_parse_fd(const char *param) { int fd; char *endptr = NULL; fd = strtol(param, &endptr, 10); if (*endptr || (fd == 0 && param == endptr)) { return -1; } return fd; } /* * Send/recv data with iovec buffers * * This function send/recv data from/to the iovec buffer directly. * The first `offset' bytes in the iovec buffer are skipped and next * `len' bytes are used. * * For example, * * do_sendv_recvv(sockfd, iov, len, offset, 1); * * is equal to * * char *buf = malloc(size); * iov_to_buf(iov, iovcnt, buf, offset, size); * send(sockfd, buf, size, 0); * free(buf); */ static int do_sendv_recvv(int sockfd, struct iovec *iov, int len, int offset, int do_sendv) { int ret, diff, iovlen; struct iovec *last_iov; /* last_iov is inclusive, so count from one. */ iovlen = 1; last_iov = iov; len += offset; while (last_iov->iov_len < len) { len -= last_iov->iov_len; last_iov++; iovlen++; } diff = last_iov->iov_len - len; last_iov->iov_len -= diff; while (iov->iov_len <= offset) { offset -= iov->iov_len; iov++; iovlen--; } iov->iov_base = (char *) iov->iov_base + offset; iov->iov_len -= offset; { #if defined CONFIG_IOVEC && defined CONFIG_POSIX struct msghdr msg; memset(&msg, 0, sizeof(msg)); msg.msg_iov = iov; msg.msg_iovlen = iovlen; do { if (do_sendv) { ret = sendmsg(sockfd, &msg, 0); } else { ret = recvmsg(sockfd, &msg, 0); } } while (ret == -1 && errno == EINTR); #else struct iovec *p = iov; ret = 0; while (iovlen > 0) { int rc; if (do_sendv) { rc = send(sockfd, p->iov_base, p->iov_len, 0); } else { rc = qemu_recv(sockfd, p->iov_base, p->iov_len, 0); } if (rc == -1) { if (errno == EINTR) { continue; } if (ret == 0) { ret = -1; } break; } if (rc == 0) { break; } ret += rc; iovlen--, p++; } #endif } /* Undo the changes above */ iov->iov_base = (char *) iov->iov_base - offset; iov->iov_len += offset; last_iov->iov_len += diff; return ret; } int qemu_recvv(int sockfd, struct iovec *iov, int len, int iov_offset) { return do_sendv_recvv(sockfd, iov, len, iov_offset, 0); } int qemu_sendv(int sockfd, struct iovec *iov, int len, int iov_offset) { return do_sendv_recvv(sockfd, iov, len, iov_offset, 1); }