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Add SHELL_ERROR and SHELL_EXIT_CODE magic variables to psql.

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These are set after a \! command or a backtick substitution.
SHELL_ERROR is just "true" for error (nonzero exit status) or "false"
for success, while SHELL_EXIT_CODE records the actual exit status
following standard shell/system(3) conventions.

Corey Huinker, reviewed by Maxim Orlov and myself

Discussion: https://postgr.es/m/CADkLM=cWao2x2f+UDw15W1JkVFr_bsxfstw=NGea7r9m4j-7rQ@mail.gmail.com
This commit is contained in:
Tom Lane
2023-03-21 13:03:42 -04:00
parent 0f85db92b9
commit b0d8f2d983
6 changed files with 88 additions and 3 deletions
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19
src/common/wait_error.c
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@@ -127,3 +127,22 @@ wait_result_is_any_signal(int exit_status, bool include_command_not_found)
return true;
return false;
}
/*
* Return the shell exit code (normally 0 to 255) that corresponds to the
* given wait status. The argument is a wait status as returned by wait(2)
* or waitpid(2), which also applies to pclose(3) and system(3). To support
* the latter two cases, we pass through "-1" unchanged.
*/
int
wait_result_to_exit_code(int exit_status)
{
if (exit_status == -1)
return -1; /* failure of pclose() or system() */
if (WIFEXITED(exit_status))
return WEXITSTATUS(exit_status);
if (WIFSIGNALED(exit_status))
return 128 + WTERMSIG(exit_status);
/* On many systems, this is unreachable */
return -1;
}