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Use printf's %m format instead of strerror(errno) in more places

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Most callers of strerror() are removed from the backend code.  The
remaining callers require special handling with a saved errno from a
previous system call.  The frontend code still needs strerror() where
error states need to be handled outside of fprintf.

Note that pg_regress is not changed to use %m as the TAP output may
clobber errno, since those functions call fprintf() and friends before
evaluating the format string.

Support for %m in src/port/snprintf.c has been added in d6c55de1f9,
hence all the stable branches currently supported include it.

Author: Dagfinn Ilmari Mannsåker
Discussion: https://postgr.es/m/87sf13jhuw.fsf@wibble.ilmari.org
This commit is contained in:
Michael Paquier
2024-03-12 10:02:54 +09:00
parent 3045324214
commit 2c8118ee5d
24 changed files with 158 additions and 192 deletions
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21
src/backend/postmaster/postmaster.c
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@@ -1375,12 +1375,12 @@ PostmasterMain(int argc, char *argv[])
/* Make PID file world readable */
if (chmod(external_pid_file, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH) != 0)
write_stderr("%s: could not change permissions of external PID file \"%s\": %s\n",
progname, external_pid_file, strerror(errno));
write_stderr("%s: could not change permissions of external PID file \"%s\": %m\n",
progname, external_pid_file);
}
else
write_stderr("%s: could not write external PID file \"%s\": %s\n",
progname, external_pid_file, strerror(errno));
write_stderr("%s: could not write external PID file \"%s\": %m\n",
progname, external_pid_file);
on_proc_exit(unlink_external_pid_file, 0);
}
@@ -1589,8 +1589,8 @@ checkControlFile(void)
{
write_stderr("%s: could not find the database system\n"
"Expected to find it in the directory \"%s\",\n"
"but could not open file \"%s\": %s\n",
progname, DataDir, path, strerror(errno));
"but could not open file \"%s\": %m\n",
progname, DataDir, path);
ExitPostmaster(2);
}
FreeFile(fp);
@@ -6277,15 +6277,13 @@ read_backend_variables(char *id, Port **port, BackgroundWorker **worker)
fp = AllocateFile(id, PG_BINARY_R);
if (!fp)
{
write_stderr("could not open backend variables file \"%s\": %s\n",
id, strerror(errno));
write_stderr("could not open backend variables file \"%s\": %m\n", id);
exit(1);
}
if (fread(&param, sizeof(param), 1, fp) != 1)
{
write_stderr("could not read from backend variables file \"%s\": %s\n",
id, strerror(errno));
write_stderr("could not read from backend variables file \"%s\": %m\n", id);
exit(1);
}
@@ -6293,8 +6291,7 @@ read_backend_variables(char *id, Port **port, BackgroundWorker **worker)
FreeFile(fp);
if (unlink(id) != 0)
{
write_stderr("could not remove file \"%s\": %s\n",
id, strerror(errno));
write_stderr("could not remove file \"%s\": %m\n", id);
exit(1);
}
#else