[Bug libc/19866] New: mkstempat and mkdtempat

[dvw at phas dot ubc.ca]

https://sourceware.org/bugzilla/show_bug.cgi?id=19866

            Bug ID: 19866
           Summary: mkstempat and mkdtempat
           Product: glibc
           Version: 2.23
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: dvw at phas dot ubc.ca
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---

I maintain a library (unimaginatively called GetData) for accessing a
filesystem-based database for scientific data.  It uses directory file
descriptors and openat() &c. where possible to help deal with the problems
those functions were meant to deal with.

Where we run into a snag is when required to create a temporary file in a
directory for which the library holds a descriptor.  Then we're forced to use
mktemp() to generate a temporary filename and then use openat(... O_EXCL) to
create the file.

This works, but it presumably suffers from the deficiencies that mk[sd]temp
were designed to fix.  So, it would be better if the system library provided
the analogous ..at() functionality for those functions:

  int mkstempat(int dirfd, char *template);
  char *mkdtempat(int dirfd, char *template);

which would perform the mktemp + openat/mkdir convolution.  (These functions
would also reduce the amount of communication we get from concerned users
encountering the "the use of `mktemp' is dangerous" warning when compiling our
library.)

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