#include <sys/stat.h>
#include <fcntl.h>
#include <string.h>
+#include <assert.h>
+#include <sys/mman.h>
// Wrapper for `read` that retries on partial reads.
// If last_res is non-NULL, it will be filled with the
}
PUBLIC_FN char *slurp_file(char *path, size_t *len_out, int flags) {
- int fd = open(path, O_RDONLY);
+ int fd = open(path, O_RDONLY|O_CLOEXEC);
if (fd == -1) return NULL;
char *res = slurp_fd(fd, len_out, flags);
int errno_ = errno;
PUBLIC_FN int write_file(char *path, char *buf, ssize_t len, int open_flags) {
if (len == -1) len = strlen(buf);
- int fd = open(path, open_flags, 0777);
+ int fd = open(path, open_flags|O_CLOEXEC, 0777);
if (fd == -1) return 1;
ssize_t write_res = write_nointr(fd, buf, len, NULL);
int write_errno = errno;
if (close_res) return 1;
return 0;
}
+
+PUBLIC_FN void *mmap_file(void *addr, size_t length, int prot, int flags, char *path, off_t offset) {
+ assert((flags&MAP_ANONYMOUS) == 0);
+ assert(prot&(PROT_EXEC|PROT_READ|PROT_WRITE));
+ int open_flags = O_CLOEXEC;
+ if ((prot & (PROT_READ|PROT_EXEC)) && !(prot&PROT_WRITE)) open_flags |= O_RDONLY;
+ else if ((prot & (PROT_READ|PROT_EXEC))) open_flags |= O_RDWR;
+ else open_flags |= O_WRONLY;
+ int fd = open(path, open_flags);
+ if (fd == -1) return NULL;
+ void *r = mmap(addr, length, prot, flags, fd, offset);
+ int errno_ = errno;
+ close(fd);
+ errno = errno_;
+ return (r==MAP_FAILED) ? NULL : r;
+}