diff options
Diffstat (limited to 'libc-top-half/musl/src/mman/shm_open.c')
-rw-r--r-- | libc-top-half/musl/src/mman/shm_open.c | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/libc-top-half/musl/src/mman/shm_open.c b/libc-top-half/musl/src/mman/shm_open.c new file mode 100644 index 0000000..79784bd --- /dev/null +++ b/libc-top-half/musl/src/mman/shm_open.c @@ -0,0 +1,43 @@ +#include <sys/mman.h> +#include <errno.h> +#include <fcntl.h> +#include <unistd.h> +#include <string.h> +#include <limits.h> +#include <pthread.h> + +char *__shm_mapname(const char *name, char *buf) +{ + char *p; + while (*name == '/') name++; + if (*(p = __strchrnul(name, '/')) || p==name || + (p-name <= 2 && name[0]=='.' && p[-1]=='.')) { + errno = EINVAL; + return 0; + } + if (p-name > NAME_MAX) { + errno = ENAMETOOLONG; + return 0; + } + memcpy(buf, "/dev/shm/", 9); + memcpy(buf+9, name, p-name+1); + return buf; +} + +int shm_open(const char *name, int flag, mode_t mode) +{ + int cs; + char buf[NAME_MAX+10]; + if (!(name = __shm_mapname(name, buf))) return -1; + pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs); + int fd = open(name, flag|O_NOFOLLOW|O_CLOEXEC|O_NONBLOCK, mode); + pthread_setcancelstate(cs, 0); + return fd; +} + +int shm_unlink(const char *name) +{ + char buf[NAME_MAX+10]; + if (!(name = __shm_mapname(name, buf))) return -1; + return unlink(name); +} |