3 * Copyright (C) Igor Sysoev
7 #include <ngx_config.h>
11 #if (NGX_HAVE_MAP_ANON)
14 ngx_shm_alloc(ngx_shm_t *shm)
16 shm->addr = (u_char *) mmap(NULL, shm->size,
18 MAP_ANON|MAP_SHARED, -1, 0);
20 if (shm->addr == MAP_FAILED) {
21 ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno,
22 "mmap(MAP_ANON|MAP_SHARED, %uz) failed", shm->size);
31 ngx_shm_free(ngx_shm_t *shm)
33 if (munmap((void *) shm->addr, shm->size) == -1) {
34 ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno,
35 "munmap(%p, %uz) failed", shm->addr, shm->size);
39 #elif (NGX_HAVE_MAP_DEVZERO)
42 ngx_shm_alloc(ngx_shm_t *shm)
46 fd = open("/dev/zero", O_RDWR);
49 ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno,
50 "open(\"/dev/zero\") failed");
54 shm->addr = (u_char *) mmap(NULL, shm->size, PROT_READ|PROT_WRITE,
57 if (shm->addr == MAP_FAILED) {
58 ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno,
59 "mmap(/dev/zero, MAP_SHARED, %uz) failed", shm->size);
62 if (close(fd) == -1) {
63 ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno,
64 "close(\"/dev/zero\") failed");
67 return (shm->addr == MAP_FAILED) ? NGX_ERROR : NGX_OK;
72 ngx_shm_free(ngx_shm_t *shm)
74 if (munmap((void *) shm->addr, shm->size) == -1) {
75 ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno,
76 "munmap(%p, %uz) failed", shm->addr, shm->size);
80 #elif (NGX_HAVE_SYSVSHM)
87 ngx_shm_alloc(ngx_shm_t *shm)
91 id = shmget(IPC_PRIVATE, shm->size, (SHM_R|SHM_W|IPC_CREAT));
94 ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno,
95 "shmget(%uz) failed", shm->size);
99 ngx_log_debug1(NGX_LOG_DEBUG_CORE, shm->log, 0, "shmget id: %d", id);
101 shm->addr = shmat(id, NULL, 0);
103 if (shm->addr == (void *) -1) {
104 ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno, "shmat() failed");
107 if (shmctl(id, IPC_RMID, NULL) == -1) {
108 ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno,
109 "shmctl(IPC_RMID) failed");
112 return (shm->addr == (void *) -1) ? NGX_ERROR : NGX_OK;
117 ngx_shm_free(ngx_shm_t *shm)
119 if (shmdt(shm->addr) == -1) {
120 ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno,
121 "shmdt(%p) failed", shm->addr);