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executor: switch to ioctl's instead of writes

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This commit is contained in:
Dmitry Vyukov 2015-12-03 20:30:20 +01:00
parent b7800fb0a2
commit d823a9221a
1 changed files with 13 additions and 10 deletions
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23
executor/executor.cc
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@ -27,6 +27,11 @@
#include "syscalls.h"
#define KCOV_INIT_TRACE _IOR('c', 1, unsigned long)
#define KCOV_INIT_TABLE _IOR('c', 2, unsigned long)
#define KCOV_ENABLE _IO('c', 100)
#define KCOV_DISABLE _IO('c', 101)
const int kInFd = 3;
const int kOutFd = 4;
const int kInPipeFd = 5;
@ -295,7 +300,8 @@ retry:
if (collide && (n % 2)) {
// Don't wait for every other call.
// We already have results from the previous execution.
} else if (flag_threaded) {
}
else if (flag_threaded) {
// Wait for call completion.
uint64_t start = current_time_ms();
uint64_t now = start;
@ -326,7 +332,8 @@ retry:
handle_completion(th);
}
}
} else {
}
else {
// Execute directly.
if (th != &threads[0])
fail("using non-main thread in non-thread mode");
@ -476,7 +483,8 @@ void execute_call(thread_t* th)
char buf[128];
sprintf(buf, "/dev/pts/%d", ptyno);
th->res = open(buf, th->args[1], 0);
} else {
}
else {
th->res = -1;
}
}
@ -561,10 +569,7 @@ void cover_open()
th->cover_fd = open("/sys/kernel/debug/kcov", O_RDWR);
if (th->cover_fd == -1)
fail("open of /sys/kernel/debug/kcov failed");
char cmd[64];
sprintf(cmd, "trace=%d", kCoverSize);
int n = write(th->cover_fd, cmd, strlen(cmd));
if (n != (int)strlen(cmd))
if (ioctl(th->cover_fd, KCOV_INIT_TRACE, kCoverSize))
fail("cover enable write failed");
th->cover_data = (uint32_t*)mmap(NULL, kCoverSize * sizeof(th->cover_data[0]), PROT_READ | PROT_WRITE, MAP_SHARED, th->cover_fd, 0);
if ((void*)th->cover_data == MAP_FAILED)
@ -577,9 +582,7 @@ void cover_enable(thread_t* th)
if (!flag_cover)
return;
debug("#%d: enabling /sys/kernel/debug/kcov\n", th->id);
const char* cmd = "enable";
int n = write(th->cover_fd, cmd, strlen(cmd));
if (n != (int)strlen(cmd))
if (ioctl(th->cover_fd, KCOV_ENABLE, 0))
fail("cover enable write failed");
debug("#%d: enabled /sys/kernel/debug/kcov\n", th->id);
}