diff options
Diffstat (limited to 'interrupts.c')
-rw-r--r-- | interrupts.c | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/interrupts.c b/interrupts.c new file mode 100644 index 0000000..2755ccf --- /dev/null +++ b/interrupts.c @@ -0,0 +1,47 @@ +#include <string.h> +#include <stdio.h> +#include <unistd.h> +#include "common.h" + +int interrupts(int argc, char **argv) { + FILE *f; + char buff[256]; + if(argc > 1) { + if(!strcmp(argv[1], "config")) { + puts("graph_title Interrupts & context switches\n" + "graph_args --base 1000 -l 0\n" + "graph_vlabel interrupts & ctx switches / ${graph_period}\n" + "graph_category system\n" + "graph_info This graph shows the number of interrupts and context switches on the system. These are typically high on a busy system.\n" + "intr.info Interrupts are events that alter sequence of instructions executed by a processor. They can come from either hardware (exceptions, NMI, IRQ) or software."); + puts("ctx.info A context switch occurs when a multitasking operatings system suspends the currently running process, and starts executing another.\n" + "intr.label interrupts\n" + "ctx.label context switches\n" + "intr.type DERIVE\n" + "ctx.type DERIVE\n" + "intr.max 100000\n" + "ctx.max 100000\n" + "intr.min 0\n" + "ctx.min 0"); + return 0; + } + if(!strcmp(argv[1], "autoconf")) { + if(0 == access("/proc/stat", R_OK)) + return writeyes(); + else + return writeno("/proc/stat not readable"); + } + } + if(!(f=fopen("/proc/stat", "r"))) { + fputs("cannot open /proc/stat\n", stderr); + return 1; + } + while(fgets(buff, 256, f)) { + if(!strncmp(buff, "intr ", 5)) + printf("intr.value %s", buff+5); + else if(!strncmp(buff, "ctxt ", 5)) + printf("ctx.value %s", buff+5); + } + fclose(f); + return 0; +} |