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0
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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 */
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5
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6
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7 #include <ngx_config.h>
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8 #include <ngx_core.h>
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9
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10
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11 #if (HAVE_MAP_ANON)
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12
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13 void *ngx_create_shared_memory(size_t size, ngx_log_t *log)
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14 {
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15 void *p;
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16
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17 p = mmap(NULL, size, PROT_READ|PROT_WRITE, MAP_ANON|MAP_SHARED, -1, 0);
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18
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19 if (p == MAP_FAILED) {
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20 ngx_log_error(NGX_LOG_ALERT, log, ngx_errno,
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10
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21 "mmap(MAP_ANON|MAP_SHARED, %uz) failed", size);
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0
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22 return NULL;
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23 }
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24
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25 return p;
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26 }
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27
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28 #elif (HAVE_MAP_DEVZERO)
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29
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30 void *ngx_create_shared_memory(size_t size, ngx_log_t *log)
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31 {
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32 void *p;
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33 ngx_fd_t fd;
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34
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35 fd = open("/dev/zero", O_RDWR);
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36
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37 if (fd == -1) {
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38 ngx_log_error(NGX_LOG_ALERT, log, ngx_errno,
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16
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39 "open(\"/dev/zero\") failed");
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0
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40 return NULL;
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41 }
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42
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43 p = mmap(NULL, size, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
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44
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45 if (p == MAP_FAILED) {
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46 ngx_log_error(NGX_LOG_ALERT, log, ngx_errno,
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10
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47 "mmap(/dev/zero, MAP_SHARED, %uz) failed", size);
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0
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48 p = NULL;
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49 }
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50
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51 if (close(fd) == -1) {
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16
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52 ngx_log_error(NGX_LOG_ALERT, log, ngx_errno,
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53 "close(\"/dev/zero\") failed");
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0
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54 }
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55
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56 return p;
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57 }
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58
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59 #elif (HAVE_SYSVSHM)
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60
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61 #include <sys/ipc.h>
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62 #include <sys/shm.h>
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63
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64
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65 void *ngx_create_shared_memory(size_t size, ngx_log_t *log)
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66 {
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67 int id;
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68 void *p;
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69
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70 id = shmget(IPC_PRIVATE, size, (SHM_R|SHM_W|IPC_CREAT));
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71
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72 if (id == -1) {
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73 ngx_log_error(NGX_LOG_ALERT, log, ngx_errno,
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10
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74 "shmget(%uz) failed", size);
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0
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75 return NULL;
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76 }
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77
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78 ngx_log_debug1(NGX_LOG_DEBUG_CORE, log, 0, "shmget id: %d", id);
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79
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80 p = shmat(id, NULL, 0);
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81
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82 if (p == (void *) -1) {
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83 ngx_log_error(NGX_LOG_ALERT, log, ngx_errno, "shmat() failed");
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84 p = NULL;
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85 }
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86
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87 if (shmctl(id, IPC_RMID, NULL) == -1) {
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88 ngx_log_error(NGX_LOG_ALERT, log, ngx_errno, "shmctl(IPC_RMID) failed");
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89 p = NULL;
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90 }
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91
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92 return p;
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93 }
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94
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95 #endif
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