diff options
Diffstat (limited to 'user/forktest.c')
-rw-r--r-- | user/forktest.c | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/user/forktest.c b/user/forktest.c new file mode 100644 index 0000000..be4915e --- /dev/null +++ b/user/forktest.c @@ -0,0 +1,56 @@ +// Test that fork fails gracefully. +// Tiny executable so that the limit can be filling the proc table. + +#include "kernel/types.h" +#include "kernel/stat.h" +#include "user/user.h" + +#define N 1000 + +void +printf(int fd, const char *s, ...) +{ + write(fd, s, strlen(s)); +} + +void +forktest(void) +{ + int n, pid; + + printf(1, "fork test\n"); + + for(n=0; n<N; n++){ + pid = fork(); + if(pid < 0) + break; + if(pid == 0) + exit(); + } + + if(n == N){ + printf(1, "fork claimed to work N times!\n", N); + exit(); + } + + for(; n > 0; n--){ + if(wait() < 0){ + printf(1, "wait stopped early\n"); + exit(); + } + } + + if(wait() != -1){ + printf(1, "wait got too many\n"); + exit(); + } + + printf(1, "fork test OK\n"); +} + +int +main(void) +{ + forktest(); + exit(); +} |