*/
#include "os_file.h"
+#include "detect_os.h"
#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <sys/stat.h>
-
-#if defined(WIN32)
+#if DETECT_OS_WINDOWS
#include <io.h>
#define open _open
#define fdopen _fdopen
#define O_CREAT _O_CREAT
#define O_EXCL _O_EXCL
#define O_WRONLY _O_WRONLY
+#else
+#include <unistd.h>
+#ifndef F_DUPFD_CLOEXEC
+#define F_DUPFD_CLOEXEC 1030
+#endif
#endif
}
-#if defined(__linux__)
+#if DETECT_OS_WINDOWS
+int
+os_dupfd_cloexec(int fd)
+{
+ /*
+ * On Windows child processes don't inherit handles by default:
+ * https://devblogs.microsoft.com/oldnewthing/20111216-00/?p=8873
+ */
+ return dup(fd);
+}
+#else
+int
+os_dupfd_cloexec(int fd)
+{
+ int minfd = 3;
+ int newfd = fcntl(fd, F_DUPFD_CLOEXEC, minfd);
+
+ if (newfd >= 0)
+ return newfd;
+
+ if (errno != EINVAL)
+ return -1;
+
+ newfd = fcntl(fd, F_DUPFD, minfd);
+
+ if (newfd < 0)
+ return -1;
+
+ long flags = fcntl(newfd, F_GETFD);
+ if (flags == -1) {
+ close(newfd);
+ return -1;
+ }
+
+ if (fcntl(newfd, F_SETFD, flags | FD_CLOEXEC) == -1) {
+ close(newfd);
+ return -1;
+ }
+
+ return newfd;
+}
+#endif
+
+
+#if DETECT_OS_LINUX
#include <fcntl.h>
-#include <linux/kcmp.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <unistd.h>
+/* copied from <linux/kcmp.h> */
+#define KCMP_FILE 0
static ssize_t
readN(int fd, char *buf, size_t len)
}
char *
-os_read_file(const char *filename)
+os_read_file(const char *filename, size_t *size)
{
/* Note that this also serves as a slight margin to avoid a 2x grow when
* the file is just a few bytes larger when we read it than when we
buf[offset] = '\0';
+ if (size)
+ *size = offset;
+
return buf;
}
-bool
+int
os_same_file_description(int fd1, int fd2)
{
pid_t pid = getpid();
- return syscall(SYS_kcmp, pid, pid, KCMP_FILE, fd1, fd2) == 0;
+ /* Same file descriptor trivially implies same file description */
+ if (fd1 == fd2)
+ return 0;
+
+ return syscall(SYS_kcmp, pid, pid, KCMP_FILE, fd1, fd2);
}
#else
#include "u_debug.h"
char *
-os_read_file(const char *filename)
+os_read_file(const char *filename, size_t *size)
{
errno = -ENOSYS;
return NULL;
}
-bool
+int
os_same_file_description(int fd1, int fd2)
{
+ /* Same file descriptor trivially implies same file description */
if (fd1 == fd2)
- return true;
+ return 0;
- debug_warn_once("Can't tell if different file descriptors reference the same"
- " file description, false negatives might cause trouble!\n");
- return false;
+ /* Otherwise we can't tell */
+ return -1;
}
#endif