diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/bootchart/store.c | 21 |
1 files changed, 13 insertions, 8 deletions
diff --git a/src/bootchart/store.c b/src/bootchart/store.c index 8e9a62f91d..fb3dc9ad6e 100644 --- a/src/bootchart/store.c +++ b/src/bootchart/store.c @@ -119,7 +119,7 @@ void log_sample(int sample, struct list_sample_data **ptr) { int c; int p; int mod; - static int e_fd; + static int e_fd = -1; ssize_t s; ssize_t n; struct dirent *ent; @@ -215,16 +215,21 @@ schedstat_next: } if (arg_entropy) { - if (!e_fd) { + if (e_fd < 0) { e_fd = openat(procfd, "sys/kernel/random/entropy_avail", O_RDONLY); + if (e_fd == -1) { + log_error_errno(errno, "Failed to open /proc/sys/kernel/random/entropy_avail: %m"); + exit(EXIT_FAILURE); + } } - if (e_fd) { - n = pread(e_fd, buf, sizeof(buf) - 1, 0); - if (n > 0) { - buf[n] = '\0'; - sampledata->entropy_avail = atoi(buf); - } + n = pread(e_fd, buf, sizeof(buf) - 1, 0); + if (n <= 0) { + close(e_fd); + e_fd = -1; + } else { + buf[n] = '\0'; + sampledata->entropy_avail = atoi(buf); } } |