addr:共享存储段的地址,以前调用shmat时的返回值 shmdt将使相关shmid_ds结构中的shm_nattch计数器值减1 */ int shmdt(void *addr); /* 当一个进程不再需要共享内存段时,它将调用shmdt()系统调用取消这个段,但是,这并不是从内核真正地删除这个段,而是把相关shmid_ds结构的 shm_nattch域的值减1,当这个值为0...
#include<iostream>#include<sys/shm.h>#include<sys/sem.h>#include<sys/types.h>#include<sys/ipc.h>#include<sys/file.h>#include<unistd.h>unionsemun{intval;/* Value for SETVAL */structsemid_ds*buf;/* Buffer for IPC_STAT, IPC_SET */unsignedshort*array;/* Array for GETALL, SETALL *...
read程序: https://gitee.com/uncommon_ljl/embed_linux_tutorial/tree/master/base_code/system_programing/shm_read write程序: https://gitee.com/uncommon_ljl/embed_linux_tutorial/tree/master/base_code/system_programing/shm_write PS:由于我学习进程相关的知识都是学习野火的教程,所以本文很多部分都是参考野...
static inline unsigned long copy_shminfo_to_user(void __user *buf, struct shminfo64 *in, int version) { switch(version) { switch (version) { case IPC_64: return copy_to_user(buf, in, sizeof(*in)); case IPC_OLD: { struct shminfo out; if(in->shmmax > INT_MAX) if (in->shm...
case IPC_64: return copy_to_user(buf, in, sizeof(*in)); case IPC_OLD: { struct msqid_ds out;memset(&out, 0, sizeof(out));ipc64_perm_to_ipc_perm(&in->msg_perm, &out.msg_perm);out.msg_stime = in->msg_stime; out.msg_rtime = in->msg_rtime; ...
Provide feedback We read every piece of feedback, and take your input very seriously. Include my email address so I can be contacted Cancel Submit feedback Saved searches Use saved searches to filter your results more quickly Cancel Create saved search Sign in Sign up {...
#include<iostream>#include<sys/shm.h>#include<sys/sem.h>#include<sys/types.h>#include<sys/ipc.h>unionsemun{intval;/* Value for SETVAL */structsemid_ds*buf;/* Buffer for IPC_STAT, IPC_SET */unsignedshort*array;/* Array for GETALL, SETALL */structseminfo*__buf;/* Buffer for IPC...
static inline unsigned long copy_shminfo_to_user(void __user *buf, struct shminfo64 *in, int version) { switch(version) { switch (version) { case IPC_64: return copy_to_user(buf, in, sizeof(*in)); case IPC_OLD: { struct shminfo out;...
(int msqid, int cmd, struct msqid_ds __user *buf) { int version; struct ipc_namespace *ns; struct msqid64_ds msqid64; int err; if (msqid < 0 || cmd < 0) return -EINVAL; version = ipc_parse_version(&cmd); ns = current->nsproxy->ipc_ns; switch (cmd) { case IPC_INFO: ...