| 1 | /* $Cambridge: exim/src/OS/os.c-Linux-libc5,v 1.1 2004/10/06 15:07:39 ph10 Exp $ */ |
| 2 | |
| 3 | /************************************************* |
| 4 | * Exim - an Internet mail transport agent * |
| 5 | *************************************************/ |
| 6 | |
| 7 | /* Copyright (c) University of Cambridge 2001 */ |
| 8 | /* See the file NOTICE for conditions of use and distribution. */ |
| 9 | |
| 10 | /* Linux-specific code. This is concatenated onto the generic src/os.c file. |
| 11 | Linux has an apparently unique way of getting the load average, so we provide a |
| 12 | unique function here, and define OS_LOAD_AVERAGE to stop src/os.c trying to |
| 13 | provide the function. The macro may be set initially anyway, when compiling os. |
| 14 | for utilities that don't want this function. */ |
| 15 | |
| 16 | #ifndef OS_LOAD_AVERAGE |
| 17 | #define OS_LOAD_AVERAGE |
| 18 | |
| 19 | int |
| 20 | os_getloadavg(void) |
| 21 | { |
| 22 | char buffer[40]; |
| 23 | double avg; |
| 24 | int count; |
| 25 | int fd = open ("/proc/loadavg", O_RDONLY); |
| 26 | if (fd == -1) return -1; |
| 27 | count = read (fd, buffer, sizeof(buffer)); |
| 28 | (void)close (fd); |
| 29 | if (count <= 0) return -1; |
| 30 | count = sscanf (buffer, "%lf", &avg); |
| 31 | if (count < 1) return -1; |
| 32 | |
| 33 | return (int)(avg * 1000.0); |
| 34 | } |
| 35 | |
| 36 | #endif /* OS_LOAD_AVERAGE */ |
| 37 | |
| 38 | /* End of os.c-Linux */ |
| 39 | |