greenplumn system 源码
greenplumn system 代码
文件路径：/src/port/system.c
/*-------------------------------------------------------------------------
*
* system.c
* Win32 system() and popen() replacements
*
*
* Win32 needs double quotes at the beginning and end of system()
* strings. If not, it gets confused with multiple quoted strings.
* It also requires double-quotes around the executable name and
* any files used for redirection. Filter other args through
* appendShellString() to quote them.
*
* Generated using Win32 "CMD /?":
*
* 1. If all of the following conditions are met, then quote characters
* on the command line are preserved:
*
* - no /S switch
* - exactly two quote characters
* - no special characters between the two quote characters, where special
* is one of: &<>()@^|
* - there are one or more whitespace characters between the two quote
* characters
* - the string between the two quote characters is the name of an
* executable file.
*
* 2. Otherwise, old behavior is to see if the first character is a quote
* character and if so, strip the leading character and remove the last
* quote character on the command line, preserving any text after the last
* quote character.
*
* Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
*
* src/port/system.c
*
*-------------------------------------------------------------------------
*/
#if defined(WIN32) && !defined(__CYGWIN__)
#ifndef FRONTEND
#include "postgres.h"
#else
#include "postgres_fe.h"
#endif
#include <fcntl.h>
#undef system
#undef popen
int
pgwin32_system(const char *command)
{
size_t cmdlen = strlen(command);
char *buf;
int save_errno;
int res;
/*
* Create a malloc'd copy of the command string, enclosed with an extra
* pair of quotes
*/
buf = malloc(cmdlen + 2 + 1);
if (buf == NULL)
{
errno = ENOMEM;
return -1;
}
buf[0] = '"';
memcpy(&buf[1], command, cmdlen);
buf[cmdlen + 1] = '"';
buf[cmdlen + 2] = '\0';
res = system(buf);
save_errno = errno;
free(buf);
errno = save_errno;
return res;
}
FILE *
pgwin32_popen(const char *command, const char *type)
{
size_t cmdlen = strlen(command);
char *buf;
int save_errno;
FILE *res;
/*
* Create a malloc'd copy of the command string, enclosed with an extra
* pair of quotes
*/
buf = malloc(cmdlen + 2 + 1);
if (buf == NULL)
{
errno = ENOMEM;
return NULL;
}
buf[0] = '"';
memcpy(&buf[1], command, cmdlen);
buf[cmdlen + 1] = '"';
buf[cmdlen + 2] = '\0';
res = _popen(buf, type);
save_errno = errno;
free(buf);
errno = save_errno;
return res;
}
#endif
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