+++ ./libmcount/record.c 2019-08-26 14:43:15.836981805 +0300 @@ -23,6 +23,44 @@ #define ARG_STR_MAX 98 +static int shm_open(const char *name, int oflag, mode_t mode) { + size_t namelen; + char *fname; + int fd; + + /* Construct the filename. */ + while (name[0] == '/') ++name; + + if (name[0] == '\0') { + /* The name "/" is not supported. */ + errno = EINVAL; + return -1; + } + + namelen = strlen(name); + fname = (char *) alloca(sizeof("@TERMUX_PREFIX@/tmp/") - 1 + namelen + 1); + memcpy(fname, "@TERMUX_PREFIX@/tmp/", sizeof("@TERMUX_PREFIX@/tmp/") - 1); + memcpy(fname + sizeof("@TERMUX_PREFIX@/tmp/") - 1, name, namelen + 1); + + fd = open(fname, oflag, mode); + if (fd != -1) { + /* We got a descriptor. Now set the FD_CLOEXEC bit. */ + int flags = fcntl(fd, F_GETFD, 0); + flags |= FD_CLOEXEC; + flags = fcntl(fd, F_SETFD, flags); + + if (flags == -1) { + /* Something went wrong. We cannot return the descriptor. */ + int save_errno = errno; + close(fd); + fd = -1; + errno = save_errno; + } + } + + return fd; +} + static struct mcount_shmem_buffer *allocate_shmem_buffer(char *sess_id, size_t size, int tid, int idx) {