From dace7dca77e9539b5cb459f79c1154d11b3030fe Mon Sep 17 00:00:00 2001 From: Nathan Reiner Date: Thu, 23 Mar 2023 20:28:57 +0100 Subject: first version of wlock --- wayland.c | 66 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 66 insertions(+) create mode 100644 wayland.c (limited to 'wayland.c') diff --git a/wayland.c b/wayland.c new file mode 100644 index 0000000..0787ec3 --- /dev/null +++ b/wayland.c @@ -0,0 +1,66 @@ +#include +#include +#include +#include +#include + +#include "wayland.h" + +static void randname(char *buf); +static int create_shm_file(void); + + +void +randname(char *buf) +{ + struct timespec ts; + long r; + int i; + + clock_gettime(CLOCK_REALTIME, &ts); + r = ts.tv_nsec; + for (i = 0; i < 6; ++i) { + buf[i] = 'A'+(r&15)+(r&16)*2; + r >>= 5; + } +} + +int +create_shm_file(void) +{ + int fd; + int retries = 100; + char name[] = "/wl_shm-XXXXXX"; + + do { + randname(name + sizeof(name) - 7); + --retries; + fd = shm_open(name, O_RDWR | O_CREAT | O_EXCL, 0600); + if (fd >= 0) { + shm_unlink(name); + return fd; + } + } while (retries > 0 && errno == EEXIST); + return -1; +} + +int +allocate_shm_file(size_t size) +{ + int ret; + int fd = create_shm_file(); + + if (fd < 0) + return -1; + + do { + ret = ftruncate(fd, size); + } while (ret < 0 && errno == EINTR); + + if (ret < 0) { + close(fd); + return -1; + } + + return fd; +} -- cgit v1.2.3-70-g09d2