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mdmfs(8): Check for other types of helper-program failure

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Exiting with a signal should not be treated the same as successful exit with
zero status.

Return signal exit information to the callers via negative integers, to
enable distinction from normal exit statuses.  (All consumers that check for
errors don't care what the exact non-zero exit value is -- in such a case
they print a diagnostic message and either continue or bail.)

Additionally, check for unexpected sources of waitpid() wakeup and bail if
we encounter them.

Reported by:	lev@
Reviewed by:	kib, lev, markj (earlier version)
Sponsored by:	Dell EMC Isilon
Differential Revision:	https://reviews.freebsd.org/D17035
This commit is contained in:
Conrad Meyer 2018-10-20 21:33:00 +00:00
parent 102cb8b907
commit 594fb8f519
1 changed files with 49 additions and 10 deletions
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59
sbin/mdmfs/mdmfs.c
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@ -90,6 +90,8 @@ static void do_mtptsetup(const char *, struct mtpt_info *);
static void do_newfs(const char *);
static void extract_ugid(const char *, struct mtpt_info *);
static int run(int *, const char *, ...) __printflike(2, 3);
static const char *run_exitstr(int);
static int run_exitnumber(int);
static void usage(void);
int
@ -431,7 +433,8 @@ do_mdconfig_attach(const char *args, const enum md_types mdtype)
rv = run(NULL, "%s -a %s%s -u %s%d", path_mdconfig, ta, args,
mdname, unit);
if (rv)
errx(1, "mdconfig (attach) exited with error code %d", rv);
errx(1, "mdconfig (attach) exited %s %d", run_exitstr(rv),
run_exitnumber(rv));
}
/*
@ -464,7 +467,8 @@ do_mdconfig_attach_au(const char *args, const enum md_types mdtype)
}
rv = run(&fd, "%s -a %s%s", path_mdconfig, ta, args);
if (rv)
errx(1, "mdconfig (attach) exited with error code %d", rv);
errx(1, "mdconfig (attach) exited %s %d", run_exitstr(rv),
run_exitnumber(rv));
/* Receive the unit number. */
if (norun) { /* Since we didn't run, we can't read. Fake it. */
@ -503,8 +507,8 @@ do_mdconfig_detach(void)
rv = run(NULL, "%s -d -u %s%d", path_mdconfig, mdname, unit);
if (rv && debug) /* This is allowed to fail. */
warnx("mdconfig (detach) exited with error code %d (ignored)",
rv);
warnx("mdconfig (detach) exited %s %d (ignored)",
run_exitstr(rv), run_exitnumber(rv));
}
/*
@ -518,7 +522,8 @@ do_mount_md(const char *args, const char *mtpoint)
rv = run(NULL, "%s%s /dev/%s%d%s %s", _PATH_MOUNT, args,
mdname, unit, mdsuffix, mtpoint);
if (rv)
errx(1, "mount exited with error code %d", rv);
errx(1, "mount exited %s %d", run_exitstr(rv),
run_exitnumber(rv));
}
/*
@ -531,7 +536,8 @@ do_mount_tmpfs(const char *args, const char *mtpoint)
rv = run(NULL, "%s -t tmpfs %s tmp %s", _PATH_MOUNT, args, mtpoint);
if (rv)
errx(1, "tmpfs mount exited with error code %d", rv);
errx(1, "tmpfs mount exited %s %d", run_exitstr(rv),
run_exitnumber(rv));
}
/*
@ -603,7 +609,8 @@ do_newfs(const char *args)
rv = run(NULL, "%s%s /dev/%s%d", _PATH_NEWFS, args, mdname, unit);
if (rv)
errx(1, "newfs exited with error code %d", rv);
errx(1, "newfs exited %s %d", run_exitstr(rv),
run_exitnumber(rv));
}
/*
@ -674,8 +681,12 @@ extract_ugid(const char *str, struct mtpt_info *mip)
* Run a process with command name and arguments pointed to by the
* formatted string 'cmdline'. Since system(3) is not used, the first
* space-delimited token of 'cmdline' must be the full pathname of the
* program to run. The return value is the return code of the process
* spawned. If 'ofd' is non-NULL, it is set to the standard output of
* program to run.
*
* The return value is the return code of the process spawned, or a negative
* signal number if the process exited due to an uncaught signal.
*
* If 'ofd' is non-NULL, it is set to the standard output of
* the program spawned (i.e., you can read from ofd and get the output
* of the program).
*/
@ -771,7 +782,35 @@ run(int *ofd, const char *cmdline, ...)
free(argv);
while (waitpid(pid, &status, 0) != pid)
;
return (WEXITSTATUS(status));
if (WIFEXITED(status))
return (WEXITSTATUS(status));
if (WIFSIGNALED(status))
return (-WTERMSIG(status));
err(1, "unexpected waitpid status: 0x%x", status);
}
/*
* If run() returns non-zero, provide a string explaining why.
*/
static const char *
run_exitstr(int rv)
{
if (rv > 0)
return ("with error code");
if (rv < 0)
return ("with signal");
return (NULL);
}
/*
* If run returns non-zero, provide a relevant number.
*/
static int
run_exitnumber(int rv)
{
if (rv < 0)
return (-rv);
return (rv);
}
static void