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Add a warning against modifying this code without understanding it, and

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an example of how not to make it more portable.  I've had this lying
around uncommitted since 2009...
This commit is contained in:
Dag-Erling Smørgrav 2016-11-24 14:50:21 +00:00
parent 9b6cc50d1a
commit 4e2825545b
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=309109
1 changed files with 17 additions and 1 deletions
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18
lib/libutil/flopen.c
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@ -1,5 +1,5 @@
/*-
* Copyright (c) 2007 Dag-Erling Coïdan Smørgrav
* Copyright (c) 2007-2009 Dag-Erling Coïdan Smørgrav
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
@ -37,6 +37,14 @@ __FBSDID("$FreeBSD$");
#include <libutil.h>
/*
* Reliably open and lock a file.
*
* DO NOT, UNDER PAIN OF DEATH, modify this code without first reading the
* revision history and discussing your changes with <des@freebsd.org>.
* Don't be fooled by the code's apparent simplicity; there would be no
* need for this function if it was as easy to get right as you think.
*/
int
flopen(const char *path, int flags, ...)
{
@ -100,6 +108,14 @@ flopen(const char *path, int flags, ...)
errno = serrno;
return (-1);
}
#ifdef DONT_EVEN_THINK_ABOUT_IT
if (fcntl(fd, F_SETFD, FD_CLOEXEC) != 0) {
serrno = errno;
(void)close(fd);
errno = serrno;
return (-1);
}
#endif
return (fd);
}
}