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c84264b
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master
uproctrace
libuptpl
src
write.c
formatting
Stefan Schuermans
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c84264b
at 2020-05-21 12:00:46
write.c
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#include "write.h" #include <fcntl.h> #include <stdint.h> #include <stdlib.h> #include <string.h> #include <sys/file.h> #include <unistd.h> struct uptpl_event_header_s { uint8_t magic[4]; /**< u p t 0 */ uint8_t size[4]; /**< size of payload in network byte oder */ } __attribute__((packed)); void uptpl_write(void const *data, size_t size) { if (!data || !size || size > 0xFFFFFFFF) { return; } char const *filename = getenv("UPTPL_OUTPUT"); if (!filename) { return; } int fd = open(filename, O_WRONLY | O_APPEND); if (fd == -1) { return; } if (flock(fd, LOCK_EX) == -1) { close(fd); return; } struct uptpl_event_header_s uptpl_event_header = { .magic = {'u', 'p', 't', '0'}, .size = { (size >> 24) & 0xFF, (size >> 16) & 0xFF, (size >> 8) & 0xFF, size & 0xFF, }}; write(fd, &uptpl_event_header, sizeof(uptpl_event_header)); write(fd, data, size); flock(fd, LOCK_UN); close(fd); }
