mirror of https://github.com/postgres/postgres
This includes backend "COPY TO/FROM PROGRAM '...'" syntax, and corresponding psql \copy syntax. Like with reading/writing files, the backend version is superuser-only, and in the psql version, the program is run in the client. In the passing, the psql \copy STDIN/STDOUT syntax is subtly changed: if you the stdin/stdout is quoted, it's now interpreted as a filename. For example, "\copy foo from 'stdin'" now reads from a file called 'stdin', not from standard input. Before this, there was no way to specify a filename called stdin, stdout, pstdin or pstdout. This creates a new function in pgport, wait_result_to_str(), which can be used to convert the exit status of a process, as returned by wait(3), to a human-readable string. Etsuro Fujita, reviewed by Amit Kapila.pull/3/head
Heikki Linnakangas
13 years ago
parent
73dc003bee
commit
3d009e45bd
@ -0,0 +1,92 @@ |
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/*-------------------------------------------------------------------------
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* |
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* wait_error.c |
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* Convert a wait/waitpid(2) result code to a human-readable string |
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* |
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* |
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* Portions Copyright (c) 1996-2013, PostgreSQL Global Development Group |
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* Portions Copyright (c) 1994, Regents of the University of California |
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* |
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* |
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* IDENTIFICATION |
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* src/port/wait_error.c |
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* |
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*------------------------------------------------------------------------- |
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*/ |
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#ifndef FRONTEND |
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#include "postgres.h" |
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#else |
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#include "postgres_fe.h" |
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#endif |
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#include <signal.h> |
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#include <stdio.h> |
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#include <string.h> |
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#include <sys/wait.h> |
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/*
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* Return a human-readable string explaining the reason a child process |
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* terminated. The argument is a return code returned by wait(2) or |
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* waitpid(2). The result is a translated, palloc'd or malloc'd string. |
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*/ |
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char * |
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wait_result_to_str(int exitstatus) |
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{ |
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char str[512]; |
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char *result; |
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if (WIFEXITED(exitstatus)) |
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{ |
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/*
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* Give more specific error message for some common exit codes that |
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* have a special meaning in shells. |
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*/ |
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switch (WEXITSTATUS(exitstatus)) |
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{ |
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case 126: |
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snprintf(str, sizeof(str), _("command not executable")); |
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break; |
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case 127: |
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snprintf(str, sizeof(str), _("command not found")); |
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break; |
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default: |
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snprintf(str, sizeof(str), |
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_("child process exited with exit code %d"), |
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WEXITSTATUS(exitstatus)); |
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} |
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} |
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else if (WIFSIGNALED(exitstatus)) |
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#if defined(WIN32) |
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snprintf(str, sizeof(str), |
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_("child process was terminated by exception 0x%X"), |
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WTERMSIG(exitstatus)); |
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#elif defined(HAVE_DECL_SYS_SIGLIST) && HAVE_DECL_SYS_SIGLIST |
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{ |
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char str2[256]; |
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snprintf(str2, sizeof(str2), "%d: %s", WTERMSIG(exitstatus), |
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WTERMSIG(exitstatus) < NSIG ? |
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sys_siglist[WTERMSIG(exitstatus)] : "(unknown)"); |
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snprintf(str, sizeof(str), |
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_("child process was terminated by signal %s"), str2); |
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} |
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#else |
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snprintf(str, sizeof(str), |
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_("child process was terminated by signal %d"), |
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WTERMSIG(exitstatus)); |
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#endif |
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else |
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snprintf(str, sizeof(str), |
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_("child process exited with unrecognized status %d"), |
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exitstatus); |
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#ifndef FRONTEND |
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result = pstrdup(str); |
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#else |
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result = strdup(str); |
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#endif |
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return result; |
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} |
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