src/stdio/fopen.c

   1 #include "stdio_impl.h"
   2 #include <fcntl.h>
   3 #include <string.h>
   4 #include <errno.h>
   5
   6 FILE *fopen(const char *restrict filename, const char *restrict mode)
   7 {
   8         FILE *f;
   9         int fd;
  10         int flags;
  11
  12         /* Check for valid initial mode character */
  13         if (!strchr("rwa", *mode)) {
  14                 errno = EINVAL;
  15                 return 0;
  16         }
  17
  18         /* Compute the flags to pass to open() */
  19         flags = __fmodeflags(mode);
  20
  21         fd = sys_open(filename, flags, 0666);
  22         if (fd < 0) return 0;
  23         if (flags & O_CLOEXEC)
  24                 __syscall(SYS_fcntl, fd, F_SETFD, FD_CLOEXEC);
  25
  26         f = __fdopen(fd, mode);
  27         if (f) return f;
  28
  29         __syscall(SYS_close, fd);
  30         return 0;
  31 }
  32
  33 LFS64(fopen);