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log.c
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log.c
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#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <stdlib.h>
#include <stdarg.h>
#include <time.h>
#include "log.h"
void log_write(int fd, int count, ...)
{
va_list list;
va_start(list, count);
time_t t = time(NULL);
struct tm systime = *localtime(&t);
// create a buffer and store the parameters sent to
// this function inside it, after it write the buffer
// to the log file
char log[1000] = { 0 };
sprintf(log, "[ %6d %d:%d:%d ] ", getpid(), systime.tm_hour, systime.tm_min, systime.tm_sec);
for(int i = 0; i < count; i++)
{
sprintf(log + strlen(log), "%s", va_arg(list, const char*));
}
sprintf(log + strlen(log), "\n");
va_end(list);
int ret;
while ((ret = write(fd, log, strlen(log))) == -1)
{
// check if the write would block,
// retry if needed
if (ret == EAGAIN || EWOULDBLOCK)
{
continue;
}
// some error
else
{
return;
}
}
}