Tom Lane writes:
> AFAICS, the only practical way to do this is to have a single process
> collecting the stdout/stderr from the postmaster and all its children.
I think not. It's a little tricky handling it directly in the child
processes, but it's been done before.
> If someone can offer a better alternative than Andrew's, great, let's
> see it.
How about the attached one, which I floated a while ago but which didn't
generate much interest.
--
Peter Eisentraut [EMAIL PROTECTED]
#include "c.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <signal.h>
#include <errno.h>
#include <unistd.h>
#include "pqsignal.h"
volatile static int hangup_flag = 0;
static void
signalhandler(SIGNAL_ARGS)
{
hangup_flag = 1;
}
#define BUF_SIZE 8192
#define MAX_ERRORS 200
#define MAX_ERRORS_CHECK() do { errcount++; if (max_errors > 0 && errcount >=
max_errors) exit(2); } while(0)
int
main(int argc, char *argv[])
{
const char *filename;
int fd = -1;
static char buf[BUF_SIZE];
unsigned int errcount = 0;
unsigned int max_errors = MAX_ERRORS;
if (argc != 2)
{
fprintf(stderr, "%s: missing required argument\n", argv[0]);
fprintf(stderr, "Try '%s --help' for more information.\n", argv[0]);
exit(1);
}
if (strcmp(argv[1], "--help")==0)
{
printf("this should be a help message...\n");
exit(0);
}
filename = argv[1];
fd = open(filename, O_WRONLY | O_CREAT | O_NOCTTY | O_APPEND, 0666);
if (fd < 0)
{
fprintf(stderr, "%s: could not open file %s: %s\n",
argv[0], filename, strerror(errno));
exit(1);
}
pqsignal(SIGUSR1, signalhandler);
for (;;)
{
int read_bytes;
int written_bytes;
char * buf_ptr;
read_bytes = read(0, buf, sizeof(buf));
if (read_bytes < 0)
{
if (errno == EINTR)
continue;
else
{
fprintf(stderr, "*** %s: read error from %s: %s\n",
argv[0], filename, strerror(errno));
MAX_ERRORS_CHECK();
}
}
if (read_bytes == 0)
{
/* end of file, postmaster exited? */
close(fd);
exit(0);
}
if (hangup_flag)
{
int fdnew;
fdnew = open(filename, O_WRONLY | O_CREAT | O_NOCTTY |
O_APPEND, 0666);
if (fdnew < 0)
{
fprintf(stderr, "*** %s: could not open new output
file %s: %s\n",
argv[0], filename, strerror(errno));
MAX_ERRORS_CHECK();
}
else
{
close(fd);
fd = fdnew;
}
hangup_flag = 0;
}
buf_ptr = buf;
do
{
written_bytes = write(fd, buf_ptr, read_bytes);
if (written_bytes < 0)
{
if (errno == EINTR)
continue;
fprintf(stderr, "*** %s: could not write to file %s:
%s\n",
argv[0], filename, strerror(errno));
MAX_ERRORS_CHECK();
break;
}
if (written_bytes < read_bytes)
{
buf_ptr += written_bytes;
read_bytes -= written_bytes;
continue;
}
break;
} while(1);
}
return 127;
}
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