Hello Yubin On 11 September 2017 at 04:56, Yubin Ruan <ablacktshirt@xxxxxxxxx> wrote: > Hi, > Is there any guarantee that socket(2) will return the lowest-available > file descriptor? > > I note in the man page that open(2) has that guarantee, conforming to > POSIX, but nothing about that has been add to socket(2). As socket(2) > is said to be conforming to POSIX in the main page, which implies that > guarantee, should we add that to the man page? Yes, I've added the same text to socket(2). Thanks for the report. Cheers, Michael POSIX.1: 2.14 File Descriptor Allocation All functions that open one or more file descriptors shall, unless specified otherwise, atomically allocate the lowest numbered available (that is, not already open in the calling process) file descriptor at the time of each allocation. Where a single function allocates two file descriptors (for example, pipe( ) or socketpair( )), the allocations may be independent and therefore applications should not expect them to have adjacent values or depend on which has the higher value. -- Michael Kerrisk Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/ Linux/UNIX System Programming Training: http://man7.org/training/ -- To unsubscribe from this list: send the line "unsubscribe linux-man" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
