diff options
Diffstat (limited to 'tools/power/cpupower/lib')
-rw-r--r-- | tools/power/cpupower/lib/cpupower.c | 23 | ||||
-rw-r--r-- | tools/power/cpupower/lib/cpupower_intern.h | 5 |
2 files changed, 27 insertions, 1 deletions
diff --git a/tools/power/cpupower/lib/cpupower.c b/tools/power/cpupower/lib/cpupower.c index 3656e697537e..3f7d0c0c5067 100644 --- a/tools/power/cpupower/lib/cpupower.c +++ b/tools/power/cpupower/lib/cpupower.c @@ -16,8 +16,8 @@ unsigned int cpupower_read_sysfs(const char *path, char *buf, size_t buflen) { - int fd; ssize_t numread; + int fd; fd = open(path, O_RDONLY); if (fd == -1) @@ -35,6 +35,27 @@ unsigned int cpupower_read_sysfs(const char *path, char *buf, size_t buflen) return (unsigned int) numread; } +unsigned int cpupower_write_sysfs(const char *path, char *buf, size_t buflen) +{ + ssize_t numwritten; + int fd; + + fd = open(path, O_WRONLY); + if (fd == -1) + return 0; + + numwritten = write(fd, buf, buflen - 1); + if (numwritten < 1) { + perror(path); + close(fd); + return -1; + } + + close(fd); + + return (unsigned int) numwritten; +} + /* * Detect whether a CPU is online * diff --git a/tools/power/cpupower/lib/cpupower_intern.h b/tools/power/cpupower/lib/cpupower_intern.h index 4887c76d23f8..ac1112b956ec 100644 --- a/tools/power/cpupower/lib/cpupower_intern.h +++ b/tools/power/cpupower/lib/cpupower_intern.h @@ -1,6 +1,11 @@ /* SPDX-License-Identifier: GPL-2.0 */ #define PATH_TO_CPU "/sys/devices/system/cpu/" + +#ifndef MAX_LINE_LEN #define MAX_LINE_LEN 4096 +#endif + #define SYSFS_PATH_MAX 255 unsigned int cpupower_read_sysfs(const char *path, char *buf, size_t buflen); +unsigned int cpupower_write_sysfs(const char *path, char *buf, size_t buflen); |