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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 02:56:35 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 02:56:35 +0000 |
commit | eba0cfa6b0bef4f2e73c8630a7efa3944df8b0f8 (patch) | |
tree | 74c37eede1f0634cc5de1c63c934edaa1630c6bc /vmcore-dmesg/vmcore-dmesg.c | |
parent | Initial commit. (diff) | |
download | kexec-tools-eba0cfa6b0bef4f2e73c8630a7efa3944df8b0f8.tar.xz kexec-tools-eba0cfa6b0bef4f2e73c8630a7efa3944df8b0f8.zip |
Adding upstream version 1:2.0.27.upstream/1%2.0.27upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | vmcore-dmesg/vmcore-dmesg.c | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/vmcore-dmesg/vmcore-dmesg.c b/vmcore-dmesg/vmcore-dmesg.c new file mode 100644 index 0000000..122e536 --- /dev/null +++ b/vmcore-dmesg/vmcore-dmesg.c @@ -0,0 +1,69 @@ +#include <elf_info.h> + +/* The 32bit and 64bit note headers make it clear we don't care */ +typedef Elf32_Nhdr Elf_Nhdr; + +extern const char *fname; + +/* stole this macro from kernel printk.c */ +#define LOG_BUF_LEN_MAX (uint32_t)(1U << 31) + +static void write_to_stdout(char *buf, unsigned int nr) +{ + ssize_t ret; + static uint32_t n_bytes = 0; + + n_bytes += nr; + if (n_bytes > LOG_BUF_LEN_MAX) { + fprintf(stderr, "The vmcore-dmesg.txt over 2G in size is not supported.\n"); + exit(53); + } + + ret = write(STDOUT_FILENO, buf, nr); + if (ret != nr) { + fprintf(stderr, "Failed to write out the dmesg log buffer!:" + " %s\n", strerror(errno)); + exit(54); + } +} + +static int read_vmcore_dmesg(int fd, void (*handler)(char*, unsigned int)) +{ + int ret; + + ret = read_elf(fd); + if (ret > 0) { + fprintf(stderr, "Unable to read ELF information" + " from vmcore\n"); + return ret; + } + + dump_dmesg(fd, handler); + + return 0; +} + +int main(int argc, char **argv) +{ + ssize_t ret; + int fd; + + if (argc != 2) { + fprintf(stderr, "usage: %s <kernel core file>\n", argv[0]); + return 1; + } + fname = argv[1]; + + fd = open(fname, O_RDONLY); + if (fd < 0) { + fprintf(stderr, "Cannot open %s: %s\n", + fname, strerror(errno)); + return 2; + } + + ret = read_vmcore_dmesg(fd, write_to_stdout); + + close(fd); + + return ret; +} |