Annotation of qemu/oslib-posix.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  * os-posix-lib.c
                      3:  *
                      4:  * Copyright (c) 2003-2008 Fabrice Bellard
                      5:  * Copyright (c) 2010 Red Hat, Inc.
                      6:  *
                      7:  * QEMU library functions on POSIX which are shared between QEMU and
                      8:  * the QEMU tools.
                      9:  *
                     10:  * Permission is hereby granted, free of charge, to any person obtaining a copy
                     11:  * of this software and associated documentation files (the "Software"), to deal
                     12:  * in the Software without restriction, including without limitation the rights
                     13:  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
                     14:  * copies of the Software, and to permit persons to whom the Software is
                     15:  * furnished to do so, subject to the following conditions:
                     16:  *
                     17:  * The above copyright notice and this permission notice shall be included in
                     18:  * all copies or substantial portions of the Software.
                     19:  *
                     20:  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
                     21:  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
                     22:  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
                     23:  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
                     24:  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
                     25:  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
                     26:  * THE SOFTWARE.
                     27:  */
                     28: 
                     29: #include "config-host.h"
                     30: #include "sysemu.h"
                     31: #include "trace.h"
                     32: #include "qemu_socket.h"
                     33: 
                     34: void *qemu_oom_check(void *ptr)
                     35: {
                     36:     if (ptr == NULL) {
                     37:         fprintf(stderr, "Failed to allocate memory: %s\n", strerror(errno));
                     38:         abort();
                     39:     }
                     40:     return ptr;
                     41: }
                     42: 
                     43: void *qemu_memalign(size_t alignment, size_t size)
                     44: {
                     45:     void *ptr;
                     46: #if defined(_POSIX_C_SOURCE) && !defined(__sun__)
                     47:     int ret;
                     48:     ret = posix_memalign(&ptr, alignment, size);
                     49:     if (ret != 0) {
                     50:         fprintf(stderr, "Failed to allocate %zu B: %s\n",
                     51:                 size, strerror(ret));
                     52:         abort();
                     53:     }
                     54: #elif defined(CONFIG_BSD)
                     55:     ptr = qemu_oom_check(valloc(size));
                     56: #else
                     57:     ptr = qemu_oom_check(memalign(alignment, size));
                     58: #endif
                     59:     trace_qemu_memalign(alignment, size, ptr);
                     60:     return ptr;
                     61: }
                     62: 
                     63: /* alloc shared memory pages */
                     64: void *qemu_vmalloc(size_t size)
                     65: {
                     66:     return qemu_memalign(getpagesize(), size);
                     67: }
                     68: 
                     69: void qemu_vfree(void *ptr)
                     70: {
                     71:     trace_qemu_vfree(ptr);
                     72:     free(ptr);
                     73: }
                     74: 
                     75: void socket_set_nonblock(int fd)
                     76: {
                     77:     int f;
                     78:     f = fcntl(fd, F_GETFL);
                     79:     fcntl(fd, F_SETFL, f | O_NONBLOCK);
                     80: }
                     81: 
                     82: void qemu_set_cloexec(int fd)
                     83: {
                     84:     int f;
                     85:     f = fcntl(fd, F_GETFD);
                     86:     fcntl(fd, F_SETFD, f | FD_CLOEXEC);
                     87: }
                     88: 
                     89: /*
                     90:  * Creates a pipe with FD_CLOEXEC set on both file descriptors
                     91:  */
                     92: int qemu_pipe(int pipefd[2])
                     93: {
                     94:     int ret;
                     95: 
                     96: #ifdef CONFIG_PIPE2
                     97:     ret = pipe2(pipefd, O_CLOEXEC);
                     98:     if (ret != -1 || errno != ENOSYS) {
                     99:         return ret;
                    100:     }
                    101: #endif
                    102:     ret = pipe(pipefd);
                    103:     if (ret == 0) {
                    104:         qemu_set_cloexec(pipefd[0]);
                    105:         qemu_set_cloexec(pipefd[1]);
                    106:     }
                    107: 
                    108:     return ret;
                    109: }
                    110: 
                    111: int qemu_utimensat(int dirfd, const char *path, const struct timespec *times,
                    112:                    int flags)
                    113: {
                    114:     struct timeval tv[2], tv_now;
                    115:     struct stat st;
                    116:     int i;
                    117: #ifdef CONFIG_UTIMENSAT
                    118:     int ret;
                    119: 
                    120:     ret = utimensat(dirfd, path, times, flags);
                    121:     if (ret != -1 || errno != ENOSYS) {
                    122:         return ret;
                    123:     }
                    124: #endif
                    125:     /* Fallback: use utimes() instead of utimensat() */
                    126: 
                    127:     /* happy if special cases */
                    128:     if (times[0].tv_nsec == UTIME_OMIT && times[1].tv_nsec == UTIME_OMIT) {
                    129:         return 0;
                    130:     }
                    131:     if (times[0].tv_nsec == UTIME_NOW && times[1].tv_nsec == UTIME_NOW) {
                    132:         return utimes(path, NULL);
                    133:     }
                    134: 
                    135:     /* prepare for hard cases */
                    136:     if (times[0].tv_nsec == UTIME_NOW || times[1].tv_nsec == UTIME_NOW) {
                    137:         gettimeofday(&tv_now, NULL);
                    138:     }
                    139:     if (times[0].tv_nsec == UTIME_OMIT || times[1].tv_nsec == UTIME_OMIT) {
                    140:         stat(path, &st);
                    141:     }
                    142: 
                    143:     for (i = 0; i < 2; i++) {
                    144:         if (times[i].tv_nsec == UTIME_NOW) {
                    145:             tv[i].tv_sec = tv_now.tv_sec;
                    146:             tv[i].tv_usec = tv_now.tv_usec;
                    147:         } else if (times[i].tv_nsec == UTIME_OMIT) {
                    148:             tv[i].tv_sec = (i == 0) ? st.st_atime : st.st_mtime;
                    149:             tv[i].tv_usec = 0;
                    150:         } else {
                    151:             tv[i].tv_sec = times[i].tv_sec;
                    152:             tv[i].tv_usec = times[i].tv_nsec / 1000;
                    153:         }
                    154:     }
                    155: 
                    156:     return utimes(path, &tv[0]);
                    157: }

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