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#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <unistd.h>
#include "utils/shmem.h"
#ifdef __ANDROID__
const char *uftrace_shmem_root(void)
{
static char uftrace_dir[PATH_MAX] = "";
if (uftrace_dir[0] == 0) {
const char *tmpdir;
tmpdir = getenv("TMPDIR");
if (!tmpdir)
tmpdir = "/tmp";
snprintf(uftrace_dir, sizeof(uftrace_dir), "%s/uftrace", tmpdir);
}
return uftrace_dir;
}
int uftrace_shmem_open(const char *name, int oflag, mode_t mode)
{
const char *uftrace_dir;
char *fname;
int fd;
int status;
uftrace_dir = uftrace_shmem_root();
status = mkdir(uftrace_dir, mode);
if (status < 0 && errno != EEXIST)
return -1;
if (asprintf(&fname, "%s/%s", uftrace_dir, name) < 0)
return -1;
fd = open(fname, oflag, mode);
if (fd >= 0) {
int flags = fcntl(fd, F_GETFD, 0);
flags |= FD_CLOEXEC;
if (fcntl(fd, F_SETFD, flags) < 0) {
int saved_errno = errno;
close(fd);
fd = -1;
errno = saved_errno;
}
}
free(fname);
return fd;
}
int uftrace_shmem_unlink(const char *name)
{
const char *uftrace_dir;
char *fname;
int status;
uftrace_dir = uftrace_shmem_root();
if (asprintf(&fname, "%s/%s", uftrace_dir, name))
return -1;
status = unlink(fname);
free(fname);
return status;
}
#else /* ! __ANDROID__ */
#include <sys/mman.h>
const char *uftrace_shmem_root(void)
{
return "/dev/shm";
}
int uftrace_shmem_open(const char *name, int oflag, mode_t mode)
{
return shm_open(name, oflag, mode);
}
int uftrace_shmem_unlink(const char *name)
{
return shm_unlink(name);
}
#endif
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