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(scm_readdir): Use readdir_r when available, for thread safety.

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This commit is contained in:
Kevin Ryde 2004-04-18 00:39:16 +00:00
parent 9fa6c11903
commit 9be808d8c9
1 changed files with 26 additions and 5 deletions
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31
libguile/filesys.c
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@ -803,6 +803,11 @@ SCM_DEFINE (scm_opendir, "opendir", 1, 0, 0,
#undef FUNC_NAME
/* FIXME: The glibc manual has a portability note that readdir_r may not
null-terminate its return string. The circumstances outlined for this
are not clear, nor is it clear what should be done about it. Lets worry
about this if/when someone can figure it out. */
SCM_DEFINE (scm_readdir, "readdir", 1, 0, 0,
(SCM port),
"Return (as a string) the next directory entry from the directory stream\n"
@ -817,12 +822,28 @@ SCM_DEFINE (scm_readdir, "readdir", 1, 0, 0,
SCM_MISC_ERROR ("Directory ~S is not open.", scm_list_1 (port));
errno = 0;
SCM_SYSCALL (rdent = readdir ((DIR *) SCM_CELL_WORD_1 (port)));
if (errno != 0)
SCM_SYSERROR;
{
#if HAVE_READDIR_R
/* On Solaris 2.7, struct dirent only contains "char d_name[1]" and one is
expected to provide a buffer of "sizeof(struct dirent) + NAME_MAX"
bytes. The glibc 2.3.2 manual notes this sort of thing too, and
advises "offsetof(struct dirent,d_name) + NAME_MAX + 1". Either should
suffice, we give both to be certain. */
union {
struct dirent ent;
char pad1 [sizeof(struct dirent) + NAME_MAX];
char pad2 [offsetof (struct dirent, d_name) + NAME_MAX + 1];
} u;
SCM_SYSCALL (readdir_r ((DIR *) SCM_CELL_WORD_1 (port), &u.ent, &rdent));
#else
SCM_SYSCALL (rdent = readdir ((DIR *) SCM_CELL_WORD_1 (port)));
#endif
if (errno != 0)
SCM_SYSERROR;
return (rdent ? scm_mem2string (rdent->d_name, NAMLEN (rdent))
: SCM_EOF_VAL);
return (rdent ? scm_mem2string (rdent->d_name, NAMLEN (rdent))
: SCM_EOF_VAL);
}
}
#undef FUNC_NAME